ORCID Profile
0000-0001-5423-6076
Current Organisation
Macquarie University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Marine and Estuarine Ecology (incl. Marine Ichthyology) | Ecological Impacts of Climate Change | Ecology | Biological Oceanography
ANZSRC Socio-Economic Objective (SEO)
Ecosystem Adaptation to Climate Change | Marine Oceanic Processes (excl. climate related) | Marine Flora, Fauna and Biodiversity |
Related Links
Publications
The effects of a sedative antihistamine, d-chlorpheniramine, on visuomotor spatial discrimination and regional brain activity as measured by positron emission tomography (PET)
Publisher: Wiley
Date: 2002
DOI: 10.1002/HUP.430
How well can animals navigate? Estimating the circle of confusion from tracking data
Publisher: Wiley
Date: 2006
DOI: 10.1002/ENV.774
Dynamic fine-scale sea icescape shapes adult emperor penguin foraging habitat in east Antarctica
Publisher: American Geophysical Union (AGU)
Date: 21-10-2019
DOI: 10.1029/2019GL084347
Abstract: The emperor penguin, an iconic species threatened by projected sea ice loss in Antarctica, has long been considered to forage at the fast ice edge, presumably relying on large/yearly persistent polynyas as their main foraging habitat during the breeding season. Using newly developed fine‐scale sea icescape data and historical penguin tracking data, this study for the first time suggests the importance of less recognized small openings, including cracks, flaw leads and ephemeral short‐term polynyas, as foraging habitats for emperor penguins. The tracking data retrieved from 47 emperor penguins in two different colonies in East Antarctica suggest that those penguins spent 23% of their time in ephemeral polynyas and did not use the large/yearly persistent, well‐studied polynyas, even if they occur much more regularly with predictable locations. These findings challenge our previous understanding of emperor penguin breeding habitats, highlighting the need for incorporating fine‐scale seascape features when assessing the population persistence in a rapidly changing polar environment.
A novel imaging probe for in vivo detection of neuritic and diffuse amyloid plaques in the brain
Publisher: Springer Science and Business Media LLC
Date: 2004
DOI: 10.1385/JMN:24:2:247
Finding mesopelagic prey in a changing Southern Ocean
Publisher: Springer Science and Business Media LLC
Date: 12-12-2019
DOI: 10.1038/S41598-019-55152-4
Abstract: Mesopelagic fish and squid occupy ocean depths extending below the photic zone and their vertical migrations represent a massive pathway moving energy and carbon through the water column. Their spatio-temporal distribution is however, difficult to map across remote regions particularly the vast Southern Ocean. This represents a key gap in understanding biogeochemical processes, marine ecosystem structure, and how changing ocean conditions will affect marine predators, which depend upon mesopelagic prey. We infer mesopelagic prey vertical distribution and relative abundance in the Indian sector of the Southern Ocean (20° to 130°E) with a novel approach using predator-derived indices. Fourteen years of southern elephant seal tracking and e data, from the open ocean between the Antarctic Polar Front and the southern Antarctic Circumpolar Current front, clearly show that the vertical distribution of mesopelagic prey is influenced by the physical hydrographic processes that structure their habitat. Mesopelagic prey have a more restricted vertical migration and higher relative abundance closer to the surface where Circumpolar Deep Water rises to shallower depths. Combining these observations with a future projection of Southern Ocean conditions we show that changes in the coupling of surface and deep waters will potentially redistribute mesopelagic prey. These changes are small overall, but show important spatial variability: prey will increase in relative abundance to the east of the Kerguelen Plateau but decrease to the west. The consequences for deep- ing specialists such as elephant seals and whales over this time scale will likely be minor, but the changes in mesoscale vertical energy flow have implications for predators that forage within the mesopelagic zone as well as the broader pelagic ecosystem.
Selective cognitive dysfunction in mice lacking histamine H1 and H2 receptors
Publisher: Elsevier BV
Date: 02-2007
Effect of matrix habitat on the spread of flea beetle introductions for biological control of leafy spurge
Publisher: Springer Science and Business Media LLC
Date: 20-01-2007
Calopteryx Damselfly Dispersions Arising from Multiscale Responses to Landscape Structure
Publisher: Resilience Alliance, Inc.
Date: 2000
Roles of hypothalamic subgroup histamine and orexin neurons on behavioral responses to sleep deprivation induced by the treadmill method in adolescent rats
Publisher: Japanese Pharmacological Society
Date: 2010
DOI: 10.1254/JPHS.10177FP
Movements and behaviour of blue whales satellite tagged in an Australian upwelling system
Publisher: Springer Science and Business Media LLC
Date: 03-12-2020
DOI: 10.1038/S41598-020-78143-2
Abstract: Knowledge about the movement ecology of endangered species is needed to identify biologically important areas and the spatio-temporal scale of potential human impacts on species. Blue whales ( Balaenoptera musculus ) are endangered due to twentieth century whaling and currently threatened by human activities. In Australia, they feed in the Great Southern Australian Coastal Upwelling System (GSACUS) during the austral summer. We investigate their movements, occupancy, behaviour, and environmental drivers to inform conservation management. Thirteen whales were satellite tagged, biopsy s led and photo-identified in 2015. All were genetically confirmed to be of the pygmy subspecies ( B. m. brevicauda) . In the GSACUS, whales spent most of their time over the continental shelf and likely foraging in association with several seascape variables (sea surface temperature variability, depth, wind speed, sea surface height anomaly, and chlorophyll a ). When whales left the region, they migrated west and then north along the Australian coast until they reached West Timor and Indonesia, where their movements indicated breeding or foraging behaviour. These results highlight the importance of the GSACUS as a foraging ground for pygmy blue whales inhabiting the eastern Indian Ocean and indicate the whales’ migratory route to proposed breeding grounds off Indonesia. Information about the spatio-temporal scale of potential human impacts can now be used to protect this little-known subspecies of blue whale.
Sex-specific, seasonal foraging tactics of adult grey seals (Halichoerus grypus) revealed by state-space analysis
Publisher: Wiley
Date: 11-2009
DOI: 10.1890/07-1483.1
Abstract: In many large pelagic animals, observing behavior is limited to observation by radio or satellite telemetry. In many cases, discriminating different behaviors from telemetry data has been a key, but often elusive, goal. Here we use state-space models (SSMs) to fit a correlated random walk (CRW) model that switches between two unobserved behavioral states (nominally foraging and traveling) to 41 male and 43 female adult grey seal (Halichoerus grypus) satellite telemetry tracks. The SSM results reveal markedly different spatial behavior between the sexes, fitting well with sexual size dimorphism and known dietary differences, suggesting that the sexes deal with seasonal prey availability and reproductive costs differently. From these results we were also able to produce behaviorally informed habitat use maps, showing a complex and dynamic network of small, intensely used foraging areas. Our flexible SSM approach clearly demonstrates sex-related behavioral differences, fine scale spatial and temporal foraging patterns, and a clearer picture of grey seal ecology and role in the Scotian Shelf ecosystem.
Return Customers: Foraging Site Fidelity and the Effect of Environmental Variability in Wide-Ranging Antarctic Fur Seals
Publisher: Public Library of Science (PLoS)
Date: 25-03-2015
Consequences of global shipping traffic for marine giants
Publisher: Wiley
Date: 05-12-2018
DOI: 10.1002/FEE.1987
Predator-borne acoustic transceivers and GPS tracking reveal spatiotemporal patterns of encounters with acoustically tagged fish in the open ocean
Publisher: Inter-Research Science Center
Date: 31-03-2014
DOI: 10.3354/MEPS10670
Movement responses to environment: fast inference of variation among southern elephant seals with a mixed effects model
Publisher: Cold Spring Harbor Laboratory
Date: 04-05-2018
DOI: 10.1101/314690
Abstract: Like many species, movement patterns of southern elephant seals ( Mirounga leonina ) are being influenced by long-term environmental change. These seals migrate up to 4000 km from their breeding colonies, foraging for months in a variety of Southern Ocean habitats. Understanding how movement patterns vary with environmental features and how these relationships differ among in iduals employing different foraging strategies can provide insight into foraging performance at a population level. We apply new fast-estimation tools to fit mixed effects within a random walk movement model, rapidly inferring among-in idual variability in southern elephant seal environment-movement relationships. We found that seals making foraging trips to the sea-ice on or near the Antarctic continental shelf consistently reduced speed and directionality (move persistence) with increasing sea ice coverage and had variable responses to chlorophyll a concentration, whereas seals that foraged pelagically reduced move persistence in regions where circumpolar deep water shoaled. Given future climate scenarios, pelagic foragers may encounter more productive habitat but sea-ice foragers may see reduced habitat availability. Our approach is scalable to large telemetry data sets and allows flexible combinations of mixed effects to be evaluated via model selection, thereby illuminating the ecological context of animal movements that underlie habitat use.
Individual-level variation and higher-level interpretations of space use in wide-ranging species
Publisher: Frontiers Media SA
Date: 12-11-2015
State-space models' dirty little secrets
Publisher: Springer Science and Business Media LLC
Date: 25-05-2016
DOI: 10.1038/SREP26677
Abstract: State-space models (SSMs) are increasingly used in ecology to model time-series such as animal movement paths and population dynamics. This type of hierarchical model is often structured to account for two levels of variability: biological stochasticity and measurement error. SSMs are flexible. They can model linear and nonlinear processes using a variety of statistical distributions. Recent ecological SSMs are often complex, with a large number of parameters to estimate. Through a simulation study, we show that even simple linear Gaussian SSMs can suffer from parameter- and state-estimation problems. We demonstrate that these problems occur primarily when measurement error is larger than biological stochasticity, the condition that often drives ecologists to use SSMs. Using an animal movement ex le, we show how these estimation problems can affect ecological inference. Biased parameter estimates of a SSM describing the movement of polar bears ( Ursus maritimus ) result in overestimating their energy expenditure. We suggest potential solutions, but show that it often remains difficult to estimate parameters. While SSMs are powerful tools, they can give misleading results and we urge ecologists to assess whether the parameters can be estimated accurately before drawing ecological conclusions from their results.
The retrospective analysis of Antarctic tracking data project
Publisher: Springer Science and Business Media LLC
Date: 18-03-2020
DOI: 10.1038/S41597-020-0406-X
Abstract: The Retrospective Analysis of Antarctic Tracking Data (RAATD) is a Scientific Committee for Antarctic Research project led jointly by the Expert Groups on Birds and Marine Mammals and Antarctic Bio ersity Informatics, and endorsed by the Commission for the Conservation of Antarctic Marine Living Resources. RAATD consolidated tracking data for multiple species of Antarctic meso- and top-predators to identify Areas of Ecological Significance. These datasets and accompanying syntheses provide a greater understanding of fundamental ecosystem processes in the Southern Ocean, support modelling of predator distributions under future climate scenarios and create inputs that can be incorporated into decision making processes by management authorities. In this data paper, we present the compiled tracking data from research groups that have worked in the Antarctic since the 1990s. The data are publicly available through bio ersity.aq and the Ocean Biogeographic Information System. The archive includes tracking data from over 70 contributors across 12 national Antarctic programs, and includes data from 17 predator species, 4060 in idual animals, and over 2.9 million observed locations.
Regional variation in winter foraging strategies by Weddell seals in eastern Antarctica and the Ross Sea
Publisher: Frontiers Media SA
Date: 22-09-2021
DOI: 10.3389/FMARS.2021.720335
Abstract: The relative importance of intrinsic and extrinsic determinants of animal foraging is often difficult to quantify. The most southerly breeding mammal, the Weddell seal, remains in the Antarctic pack-ice year-round. We compared Weddell seals tagged at three geographically and hydrographically distinct locations in East Antarctica (Prydz Bay, Terre Adélie , and the Ross Sea) to quantify the role of in idual variability and habitat structure in winter foraging behaviour. Most Weddell seals remained in relatively small areas close to the coast throughout the winter, but some dispersed widely. In idual utilisation distributions ( UDi , a measure of the total area used by an in idual seal) ranged from 125 to 20,825 km 2 . This variability was not due to size or sex but may be due to other intrinsic states for ex le reproductive condition or personality. The type of foraging (benthic vs. pelagic) varied from 56.6 ± 14.9% benthic es in Prydz Bay through 42.1 ± 9.4% Terre Adélie to only 25.1 ± 8.7% in the Ross Sea reflecting regional hydrographic structure. The probability of benthic ing was less likely the deeper the ocean. Ocean topography was also influential at the population level seals from Terre Adélie , with its relatively narrow continental shelf, had a core (50%) UD of only 200 km 2 , considerably smaller than the Ross Sea (1650 km 2 ) and Prydz Bay (1700 km 2 ). Sea ice concentration had little influence on the time the seals spent in shallow coastal waters, but in deeper offshore water they used areas of higher ice concentration. Marine Protected Areas (MPAs) in the Ross Sea encompass all the observed Weddell seal habitat, and future MPAs that include the Antarctic continental shelf are likely to effectively protect key Weddell seal habitat.
Animal-borne telemetry
Publisher: Frontiers Media SA
Date: 26-06-2019
Quantitative analysis of donepezil binding to acetylcholinesterase using positron emission tomography and [5-11C-methoxy]donepezil
Publisher: Elsevier BV
Date: 07-2009
State-space methods for more completely capturing behavioral dynamics from animal tracks
Publisher: Elsevier BV
Date: 06-2012
Robust hierarchical state-space models reveal diel variation in travel rates of migrating leatherback turtles
Publisher: Wiley
Date: 06-07-0005
DOI: 10.1111/J.1365-2656.2006.01129.X
Abstract: 1. Biological and statistical complexity are features common to most ecological data that hinder our ability to extract meaningful patterns using conventional tools. Recent work on implementing modern statistical methods for analysis of such ecological data has focused primarily on population dynamics but other types of data, such as animal movement pathways obtained from satellite telemetry, can also benefit from the application of modern statistical tools. 2. We develop a robust hierarchical state-space approach for analysis of multiple satellite telemetry pathways obtained via the Argos system. State-space models are time-series methods that allow unobserved states and biological parameters to be estimated from data observed with error. We show that the approach can reveal important patterns in complex, noisy data where conventional methods cannot. 3. Using the largest Atlantic satellite telemetry data set for critically endangered leatherback turtles, we show that the diel pattern in travel rates of these turtles changes over different phases of their migratory cycle. While foraging in northern waters the turtles show similar travel rates during day and night, but on their southward migration to tropical waters travel rates are markedly faster during the day. These patterns are generally consistent with ing data, and may be related to changes in foraging behaviour. Interestingly, in iduals that migrate southward to breed generally show higher daytime travel rates than in iduals that migrate southward in a non-breeding year. 4. Our approach is extremely flexible and can be applied to many ecological analyses that use complex, sequential data.
ROBUST STATE–SPACE MODELING OF ANIMAL MOVEMENT DATA
Publisher: Wiley
Date: 11-2005
DOI: 10.1890/04-1852
A standardisation framework for bio‐logging data to advance ecological research and conservation
Publisher: Wiley
Date: 04-2021
Abstract: Bio‐logging data obtained by tagging animals are key to addressing global conservation challenges. However, the many thousands of existing bio‐logging datasets are not easily discoverable, universally comparable, nor readily accessible through existing repositories and across platforms, slowing down ecological research and effective management. A set of universal standards is needed to ensure discoverability, interoperability and effective translation of bio‐logging data into research and management recommendations. We propose a standardisation framework adhering to existing data principles (FAIR: Findable, Accessible, Interoperable and Reusable and TRUST: Transparency, Responsibility, User focus, Sustainability and Technology) and involving the use of simple templates to create a data flow from manufacturers and researchers to compliant repositories, where automated procedures should be in place to prepare data availability into four standardised levels: (a) decoded raw data, (b) curated data, (c) interpolated data and (d) gridded data. Our framework allows for integration of simple tabular arrays (e.g. csv files) and creation of sharable and interoperable network Common Data Form (netCDF) files containing all the needed information for accuracy‐of‐use, rightful attribution (ensuring data providers keep ownership through the entire process) and data preservation security. We show the standardisation benefits for all stakeholders involved, and illustrate the application of our framework by focusing on marine animals and by providing ex les of the workflow across all data levels, including filled templates and code to process data between levels, as well as templates to prepare netCDF files ready for sharing. Adoption of our framework will facilitate collection of Essential Ocean Variables (EOVs) in support of the Global Ocean Observing System (GOOS) and inter‐governmental assessments (e.g. the World Ocean Assessment), and will provide a starting point for broader efforts to establish interoperable bio‐logging data formats across all fields in animal ecology.
Probability of Detecting Marine Predator-Prey and Species Interactions Using Novel Hybrid Acoustic Transmitter-Receiver Tags
Publisher: Public Library of Science (PLoS)
Date: 03-06-2014
Quantitative analysis of amyloid beta deposition in the brain of alzheimer's disease patients using PET and [11C]BF-227 and [ 18F]FACT
Publisher: Springer Berlin Heidelberg
Date: 2010
Behavioral attributes of turbine entrainment risk for adult resident fish revealed by acoustic telemetry and state-space modeling
Publisher: Springer Science and Business Media LLC
Date: 2014
Neuroimaging of histamine H1-receptor occupancy in human brain by positron emission tomography (PET): A comparative study of ebastine, a second-generation antihistamine, and (+)-chlorpheniramine, a classical antihistamine
Publisher: Wiley
Date: 11-2001
Identifying leatherback turtle foraging behaviour from satellite telemetry using a switching state-space model
Publisher: Inter-Research Science Center
Date: 14-05-2007
DOI: 10.3354/MEPS337255
State-space models for bio-loggers
Publisher: Elsevier BV
Date: 04-2013
Erratum to Neural correlates of perceptual difference between itching and pain: A human fMRI study [NeuroImage 36 (2007) 706-717] (DOI:10.1016/j.neuroimage.2007.04.003)
Publisher: Elsevier BV
Date: 2008
Response of generalist and specialist insect herbivores to landscape spatial structure
Publisher: Springer Science and Business Media LLC
Date: 1997
Assessing the potential for resource competition between the Kerguelen Plateau fisheries and southern elephant seals
Publisher: Frontiers Media SA
Date: 18-11-2022
DOI: 10.3389/FMARS.2022.1006120
Abstract: Indirect ecological interactions such as competition for resources between fisheries and marine predators have often been proposed but can be difficult to demonstrate empirically. The Kerguelen Plateau in the Southern Indian Ocean supports fisheries for both Patagonian toothfish and mackerel icefish and is also an important foraging ground for several avian and mammalian predators, including the southern elephant seal. We quantified the spatio-temporal use of the plateau by southern elephant seals and found that males and females spent 30% of their time on the plateau within the commonly used fishing grounds, indicating the possibility of competition for resources there. We then contrasted the seals’ use of two habitat types, the benthos (where interactions with the long-line fisheries are most likely) and the epi-pelagic zone. The likelihood of feeding on the benthos declined as ocean depth increased and was also less likely at night. Males were also more likely to feed on the benthos than females. The sub-adult male seals consumed an estimated 6,814 – 14,848 tons of high energy content prey (including toothfish) and females 7,085 – 18,037 tons from the plateau during the post-molt winter months. For males this represented 79.6 - 173.4% of the mean annual catch by the Kerguelen fishery compared to 82.8 - 210.7% for adult females. When considering the seals consumption of fish from the benthos within the fishing grounds these estimates decreased to 3.6 - 15.1% of the fishery’s total annual catch for females and 7.8 - 19.1% for males. While this further indicates the possibility of indirect ecological interactions (with the fishery taking more fish than the seals), the lack of detailed diet information for the seals precludes us from establishing the degree or nature of the possible interactions because the importance of toothfish and icefish in the diet of the seals is unknown. However, the unique life history and highly polygynous nature of this species, and the lack of evidence of a measurable effect on either the seal’s population growth rates or the catch per unit of the fishery, suggest that any indirect ecological interactions are not of sufficient magnitude to affect either the seal population or the fishery.
Chapter 8 Roles of the Histaminergic Neurotransmission on Methamphetamine-Induced Locomotor Sensitization and Reward: A Study of Receptors Gene Knockout Mice
Publisher: Elsevier
Date: 2009
Environmental drivers of population-level variation in the migratory and diving ontogeny of an Arctic top predator
Publisher: The Royal Society
Date: 03-2022
DOI: 10.1098/RSOS.211042
Abstract: The development of migratory strategies that enable juveniles to survive to sexual maturity is critical for species that exploit seasonal niches. For animals that forage via breath-hold ing, this requires a combination of both physiological and foraging skill development. Here, we assess how migratory and e behaviour develop over the first year of life for a migratory Arctic top predator, the harp seal Pagophilus groenlandicus , tracked using animal-borne satellite relay data loggers. We reveal similarities in migratory movements and differences in ing behaviour between 38 juveniles tracked from the Greenland Sea and Northwest Atlantic breeding populations. In both regions, periods of resident and transitory behaviour during migration were associated with proxies for food availability: sea ice concentration and bathymetric depth. However, while ontogenetic development of e behaviour was similar for both populations of juveniles over the first 25 days, after this time Greenland Sea animals performed shorter and shallower es and were more closely associated with sea ice than Northwest Atlantic animals. Together, these results highlight the role of both intrinsic and extrinsic factors in shaping early life behaviour. Variation in the environmental conditions experienced during early life may shape how different populations respond to the rapid changes occurring in the Arctic ocean ecosystem.
Contrasting decadal trends in mortality between large and small individuals in skate populations in Atlantic Canada
Publisher: Canadian Science Publishing
Date: 2013
Abstract: Mature thorny (Amblyraja radiata), winter (Leucoraja ocellata), and smooth (Malacoraja senta) skates have declined to very low abundance in the southern Gulf of St. Lawrence (SGSL) and on the eastern Scotian Shelf (ESS). We used stage-structured state-space models to examine decadal patterns in mortality rates in these skates. Mortality at early life stages (embryos in egg cases, hatchlings, and (or) small juveniles) appeared to decrease between the 1970s and the 2000s. In contrast, estimated mortality rates increased for larger in iduals over this period. Although potentially confounded in models with effects of any changes in juvenile growth, the estimated increases in mortality could not instead be attributed solely to changes in growth. Increases in the mortality of large in iduals appeared to reflect increases in natural mortality, possibly due to predation by grey seals. Increases in natural mortality were not evident for skates on the neighbouring western Scotian Shelf, where grey seal abundance has remained lower. Even in the absence of fishing, recovery of skates is unlikely under current ecosystem conditions in the SGSL and on the ESS.
Predicted habitat shifts of Pacific top predators in a changing climate
Publisher: Springer Science and Business Media LLC
Date: 23-09-2012
DOI: 10.1038/NCLIMATE1686
Effect of Habitat Patch Characteristics on Abundance and Diversity of Insects in an Agricultural Landscape
Publisher: Springer Science and Business Media LLC
Date: 03-1998
Tracking the fidelity of Atlantic bluefin tuna released in Canadian waters to the gulf of Mexico spawning grounds
Publisher: Canadian Science Publishing
Date: 11-2015
Abstract: The objective of this study was to advance the use of pop-up satellite archival tags to track the migrations of Atlantic bluefin tuna (Thunnus thynnus) to their spawning grounds. Deployment of tags occurred in the Gulf of St. Lawrence, Canada, during fall months from 2007 to 2013. Pop-up satellite archival tags (n = 135) were attached to 125 Atlantic bluefin tuna (curved fork length (CFL) = 268 ± 20 cm (mean ± SD)) with the objective of keeping tags on until visitation to a spawning area or longer. A dataset of 18 800 days was acquired, which included 5800 days of time-series data from 19 recovered satellite tags. Many Atlantic bluefin tuna visited the Gulf of Mexico spawning grounds (74%), the mean size of which was 275 ± 14 cm (CFL ± SD, n = 49), with a measured CFL of 243 to 302 cm. These fish had a mean entry date into the Gulf of Mexico of 14 January ± 42 days (SD). The mean residency period for fish that had tracks with entrance and exit from the Gulf of Mexico was 123 ± 49 days (SD) (n = 22). Atlantic bluefin tuna that moved into the Gulf of Mexico during the spawning season remained west of the 45°W meridian for the duration of the track. Electronic tagging datasets from two fish were obtained before, during, and after the Deepwater Horizon oil spill. Both fish utilized habitat in the vicinity of the Macondo Well on 20 April 2010 when the Deepwater Horizon oil drilling rig accident occurred. Spawning hotspots are identified in the Gulf of Mexico using kernel density analyses and compared with the newly established closed areas.
Animal Borne Ocean Sensors – AniBOS – an essential component of the Global Ocean Observing System
Publisher: Frontiers Media SA
Date: 05-11-2021
DOI: 10.3389/FMARS.2021.751840
Abstract: Marine animals equipped with biological and physical electronic sensors have produced long-term data streams on key marine environmental variables, hydrography, animal behavior and ecology. These data are an essential component of the Global Ocean Observing System (GOOS). The Animal Borne Ocean Sensors (AniBOS) network aims to coordinate the long-term collection and delivery of marine data streams, providing a complementary capability to other GOOS networks that monitor Essential Ocean Variables (EOVs), essential climate variables (ECVs) and essential bio ersity variables (EBVs). AniBOS augments observations of temperature and salinity within the upper ocean, in areas that are under-s led, providing information that is urgently needed for an improved understanding of climate and ocean variability and for forecasting. Additionally, measurements of chlorophyll fluorescence and dissolved oxygen concentrations are emerging. The observations AniBOS provides are used widely across the research, modeling and operational oceanographic communities. High latitude, shallow coastal shelves and tropical seas have historically been s led poorly with traditional observing platforms for many reasons including sea ice presence, limited satellite coverage and logistical costs. Animal-borne sensors are helping to fill that gap by collecting and transmitting in near real time an average of 500 temperature-salinity-depth profiles per animal annually and, when instruments are recovered (∼30% of instruments deployed annually, n = 103 ± 34), up to 1,000 profiles per month in these regions. Increased observations from under-s led regions greatly improve the accuracy and confidence in estimates of ocean state and improve studies of climate variability by delivering data that refine climate prediction estimates at regional and global scales. The GOOS Observations Coordination Group (OCG) reviews, advises on and coordinates activities across the global ocean observing networks to strengthen the effective implementation of the system. AniBOS was formally recognized in 2020 as a GOOS network. This improves our ability to observe the ocean’s structure and animals that live in them more comprehensively, concomitantly improving our understanding of global ocean and climate processes for societal benefit consistent with the UN Sustainability Goals 13 and 14: Climate and Life below Water. Working within the GOOS OCG framework ensures that AniBOS is an essential component of an integrated Global Ocean Observing System.
Environmental correlates of temporal variation in the prey species of Australian fur seals inferred from scat analysis
Publisher: The Royal Society
Date: 10-2022
DOI: 10.1098/RSOS.211723
Abstract: Marine ecosystems in southeastern Australia are responding rapidly to climate change. We monitored the diet of the Australian fur seal ( Arctocephalus pusillus doriferus ), a key marine predator, over 17 years (1998–2014) to examine temporal changes. Frequency of occurrence (FO) of prey was used as a proxy for ecosystem change. Hard part analysis identified 71 prey taxa, with eight dominant taxa in greater than 70% of s les and predominantly included benthic and small pelagic fish. FO changed over time, e.g. redbait ( Emmelichthys nitidus ) reduced after 2005 when jack mackerel ( Trachurus declivis ) increased, and pilchard ( Sardinops sajax ) increased after 2009. Using generalized additive models, correlations between FO and environmental variables were evident at both the local (e.g. wind, sea surface temperature (SST)) and regional (e.g. El Niño–Southern Oscillation Index (SOI), Southern Annular Mode (SAM)) scales, with redbait and pilchard showing the best model fits (greater than 75% deviance explained). Positive SAM was correlated to FO for both species, and wind and season were important for redbait, while SOI and SST were important for pilchard. Both large-scale and regional processes influenced prey taxa in variable ways. We predict that the erse and adaptable diet of the Australian fur seal will be advantageous in a rapidly changing ecosystem.
State-space framework for estimating measurement error from double-tagging telemetry experiments
Publisher: Wiley
Date: 03-11-2012
A continuous-time state-space model for rapid quality control of Argos locations from animal-borne tags
Publisher: Springer Science and Business Media LLC
Date: 03-03-2027
DOI: 10.1186/S40462-020-00217-7
Abstract: State-space models are important tools for quality control and analysis of error-prone animal movement data. The near real-time (within 24 h) capability of the Argos satellite system can aid dynamic ocean management of human activities by informing when animals enter wind farms, shipping lanes, and other intensive use zones. This capability also facilitates the use of ocean observations from animal-borne sensors in operational ocean forecasting models. Such near real-time data provision requires rapid, reliable quality control to deal with error-prone Argos locations. We formulate a continuous-time state-space model to filter the three types of Argos location data (Least-Squares, Kalman filter, and Kalman smoother), accounting for irregular timing of observations. Our model is deliberately simple to ensure speed and reliability for automated, near real-time quality control of Argos location data. We validate the model by fitting to Argos locations collected from 61 in iduals across 7 marine vertebrates and compare model-estimated locations to contemporaneous GPS locations. We then test assumptions that Argos Kalman filter/smoother error ellipses are unbiased, and that Argos Kalman smoother location accuracy cannot be improved by subsequent state-space modelling. Estimation accuracy varied among species with Root Mean Squared Errors usually km and these decreased with increasing data s ling rate and precision of Argos locations. Including a model parameter to inflate Argos error ellipse sizes in the north - south direction resulted in more accurate location estimates. Finally, in some cases the model appreciably improved the accuracy of the Argos Kalman smoother locations, which should not be possible if the smoother is using all available information. Our model provides quality-controlled locations from Argos Least-Squares or Kalman filter data with accuracy similar to or marginally better than Argos Kalman smoother data that are only available via fee-based reprocessing. Simplicity and ease of use make the model suitable both for automated quality control of near real-time Argos data and for manual use by researchers working with historical Argos data.
Comparison study of amyloid PET and voxel-based morphometry analysis in mild cognitive impairment and Alzheimer's disease
Publisher: Elsevier BV
Date: 10-2009
Molecular PET Imaging of Acetylcholine Esterase, Histamine H1 Receptor and Amyloid Deposits in Alzheimer Disease
Publisher: Springer Berlin Heidelberg
Date: 2009
Predator-derived bioregions in the Southern Ocean
Publisher: Elsevier BV
Date: 08-2022
Tracking apex marine predator movements in a dynamic ocean
Publisher: Springer Science and Business Media LLC
Date: 22-06-2011
DOI: 10.1038/NATURE10082
Abstract: Pelagic marine predators face unprecedented challenges and uncertain futures. Overexploitation and climate variability impact the abundance and distribution of top predators in ocean ecosystems. Improved understanding of ecological patterns, evolutionary constraints and ecosystem function is critical for preventing extinctions, loss of bio ersity and disruption of ecosystem services. Recent advances in electronic tagging techniques have provided the capacity to observe the movements and long-distance migrations of animals in relation to ocean processes across a range of ecological scales. Tagging of Pacific Predators, a field programme of the Census of Marine Life, deployed 4,306 tags on 23 species in the North Pacific Ocean, resulting in a tracking data set of unprecedented scale and species ersity that covers 265,386 tracking days from 2000 to 2009. Here we report migration pathways, link ocean features to multispecies hotspots and illustrate niche partitioning within and among congener guilds. Our results indicate that the California Current large marine ecosystem and the North Pacific transition zone attract and retain a erse assemblage of marine vertebrates. Within the California Current large marine ecosystem, several predator guilds seasonally undertake north-south migrations that may be driven by oceanic processes, species-specific thermal tolerances and shifts in prey distributions. We identify critical habitats across multinational boundaries and show that top predators exploit their environment in predictable ways, providing the foundation for spatial management of large marine ecosystems.
Styrylbenzoxazole Derivatives for In Vivo Imaging Amyloid Plaques in the Brain
Publisher: Society for Neuroscience
Date: 10-03-2004
DOI: 10.1523/JNEUROSCI.4456-03.2004
Abstract: Progressive deposition of senile plaques (SPs) is one of the major neuropathological features of Alzheimer's disease (AD) that precedes cognitive decline. Noninvasive detection of SPs could, therefore, be a potential diagnostic test for early detection of AD patients. For imaging SPs in the living brain, we have developed a series of styrylbenzoxazole derivatives that achieve high binding affinity for amyloid-β (Aβ) fibrils. One of these compounds, 6-(2-Fluoroethoxy)-2-[2-(4-methylaminophenil) ethenyl]benzoxazole (BF-168), selectively binds SPs in AD brain sections and recognizes Aβ1-42-positive diffuse plaques as well as neuritic plaques in AD brain sections. Intravenous injection of BF-168 in PS1/APP and APP23 transgenic mice resulted in specific in vivo labeling to both compact and diffuse amyloid deposits in the brain. In addition, 18 F-radiolabeled BF-168 demonstrated abundant initial brain uptake (3.9% injected dose/gm at 2 min after injection) and fast clearance ( t 1/2 = 24.7 min) after intravenous administration in normal mice. Furthermore, autoradiograms of brain sections from APP23 transgenic mice at 180 min after intravenous injection of [ 18 F]BF-168 showed selective labeling of brain amyloid deposits with little nonspecific binding. These findings strongly suggest that styrylbenzoxazole derivatives are promising candidate probes for positron emission tomography and single-photon emission computed tomography imaging for early detection of amyloid plaque formation.
Variability in prey field structure drives inter-annual differences in prey encounter by a marine predator, the little penguin
Publisher: The Royal Society
Date: 09-2022
DOI: 10.1098/RSOS.220028
Abstract: Understanding how marine predators encounter prey across patchy landscapes remains challenging due to difficulties in measuring the three-dimensional structure of pelagic prey fields at scales relevant to animal movement. We measured at-sea behaviour of a central-place forager, the little penguin ( Eudyptula minor ), over 5 years (2015–2019) using GPS and e loggers. We made contemporaneous measurements of the prey field within the penguins' foraging range via boat-based acoustic surveys. We developed a prey encounter index by comparing estimates of acoustic prey density encountered along actual penguin tracks to those encountered along simulated penguin tracks with the same characteristics as real tracks but that moved randomly through the prey field. In most years, penguin tracks encountered prey better than simulated random movements greater than 99% of the time, and penguin e depths matched peaks in the vertical distribution of prey. However, when prey was unusually sparse and/or deep, penguins had worse than random prey encounter indices, exhibited es that mismatched depth of maximum prey density, and females had abnormally low body mass (5.3% lower than average). Reductions in prey encounters owing to decreases in the density or accessibility of prey may ultimately lead to reduced fitness and population declines in central-place foraging marine predators.
Differential cognitive effects of ebastine and (+)-chlorpheniramine in healthy subjects: Correlation between cognitive impairment and plasma drug concentration
Publisher: Wiley
Date: 03-2002
The influence of matrix habitat on Aphthona flea beetle immigration to leafy spurge patches
Publisher: Springer Science and Business Media LLC
Date: 04-2001
Abstract: Variation in movement ability by insects among different non-habitat (matrix) types may have important implications for both metapopulation dynamics and weed biocontrol practices. We used a mark-recapture experiment to explore the effects of two different matrix habitats (grass vs shrub) on the ability of two species of Aphthona (Chrysomelidae: Coleoptera) flea beetle to immigrate to patches of the invasive weed, leafy spurge. Using generalized linear models, we compared effects of the matrix habitat types, species and sex on observed immigration probabilities. Our analyses demonstrated that one species (A. nigriscutis) had a much higher immigration probability when moving through a grass-dominated matrix than a shrub-dominated matrix whereas immigration probabilities for the second species (A. lacertosa) were similar in both matrix habitats but significantly lower overall than for A. nigriscutis. Furthermore, A. nigriscutis females were more likely to immigrate to spurge patches embedded in a grass matrix than in shrub, whereas the opposite occurred for males. Our results suggest that metapopulation dynamics may be strongly affected by the type(s) of matrix habitat present on a landscape. These effects also suggest that release strategies for weed biocontrol should be tailored according to the structure of the landscape into which releases are planned. In addition, even closely related species can have significantly different movement abilities which will also affect release strategies.
A citizen science approach to long‐term monitoring of humpback whales (Megaptera novaeangliae) off Sydney, Australia
Publisher: Wiley
Date: 21-10-2019
DOI: 10.1111/MMS.12651
Abstract: The Cape Solander Whale Migration Study is a citizen science project that annually counts northward migrating humpback whales ( Megaptera novaeangliae ) off Cape Solander, Sydney, Australia. Dedicated observers have compiled a 20‐year data set (1997–2017) of shore‐based observations from Cape Solander's high vantage point. Using this long‐term data set collected by citizen scientists, we sought to estimate the humpback whale population trend as it continues to recover postexploitation. We estimated an exponential growth rate of 0.099 (95% CI = 0.079–0.119) using a generalized linear model, based on observer effort (number of observation days) and number of whales observed, equating to 10% per annum growth in sightings since 1997. We found that favorable weather conditions for spotting whales off Cape Solander consisted of winds km/hr from a southerly through a north westerly direction. Incidental observations of other cetacean species included the endangered blue whale ( Balaenoptera musculus ) and data deficient species such as killer whales ( Orcinus orca ) and false killer whales ( Pseudorca crassidens ). Citizen science‐based studies can provide a cost‐effective approach to monitoring wildlife over the time necessary to detect change in a population. Information obtained from citizen science projects like this may help inform policy makers responsible for State and Federal protection of cetaceans in Australian waters and beyond.
In vivo imaging of amyloid plaques
Publisher: Japanese Pharmacological Society
Date: 2008
DOI: 10.1254/FPJ.131.333
aniMotum, an R package for animal movement data: Rapid quality control, behavioural estimation and simulation
Publisher: Wiley
Date: 26-01-2023
Abstract: Animal tracking data are indispensable for understanding the ecology, behaviour and physiology of mobile or cryptic species. Meaningful signals in these data can be obscured by noise due to imperfect measurement technologies, requiring rigorous quality control as part of any comprehensive analysis. State–space models are powerful tools that separate signal from noise. These tools are ideal for quality control of error‐prone location data and for inferring where animals are and what they are doing when they record or transmit other information. However, these statistical models can be challenging and time‐consuming to fit to erse animal tracking data sets. The R package aniMotum eases the tasks of conducting quality control on and inference of changes in movement from animal tracking data. This is achieved via: (1) a simple but extensible workflow that accommodates both novice and experienced users (2) automated processes that alleviate complexity from data processing and model specification/fitting steps (3) simple movement models coupled with a powerful numerical optimization approach for rapid and reliable model fitting. We highlight aniMotum 's capabilities through three applications to real animal tracking data. Full R code for these and additional applications is included as Supporting Information, so users can gain a deeper understanding of how to use aniMotum for their own analyses.
Assessing Performance of Bayesian State-Space Models Fit to Argos Satellite Telemetry Locations Processed with Kalman Filtering
Publisher: Public Library of Science (PLoS)
Date: 20-03-2014
Predicting krill swarm characteristics important for marine predators foraging off East Antarctica
Publisher: Wiley
Date: 27-09-2018
DOI: 10.1111/ECOG.03080
Taking animal tracking to new depths
Publisher: Wiley
Date: 02-2015
DOI: 10.1890/14-0469.1
Abstract: In animal ecology, a question of key interest for aquatic species is how changes in movement behavior are related in the horizontal and vertical dimensions when in iduals forage. Alternative theoretical models and inconsistent empirical findings mean that this question remains unresolved. Here we tested expectations by incorporating the vertical dimension ( e information) when predicting switching between movement states ("resident" or "directed") within a state-space model. We integrated telemetry-based tracking and ing data available for four seal species (southern elephant, Weddell, antarctic fur, and crabeater) in East Antarctica. Where possible, we included e variables derived from the relationships between (1) e duration and depth (as a measure of effort), and (2) e duration and the post e surface interval (as a physiological measure of cost). Our results varied within and across species, but there was a general tendency for the probability of switching into "resident" state to be positively associated with shorter e durations (for a given depth) and longer post e surface intervals (for a given e duration). Our results add to a growing body of literature suggesting that simplistic interpretations of optimal foraging theory based only on horizontal movements do not directly translate into the vertical dimension in dynamic marine environments. Analyses that incorporate at least two dimensions can test more sophisticated models of foraging behavior.
Influence of dispersal, stochasticity, and an Allee effect on the persistence of weed biocontrol introductions
Publisher: Elsevier BV
Date: 05-2007
Quinoline and benzimidazole derivatives: Candidate probes for in vivo imaging of tau pathology in Alzheimer's disease
Publisher: Society for Neuroscience
Date: 23-11-2005
DOI: 10.1523/JNEUROSCI.1738-05.2005
Abstract: Neurofibrillary tangles (NFTs), neuropil threads, and neuritic elements of senile plaques predominantly comprise hyperphosphorylated tau protein and represent pathological characteristics of Alzheimer's disease (AD). These lesions occur before the presentation of clinical symptoms and correlate with the severity of dementia. In vivo detection of these lesions would thus prove useful for preclinical diagnosis of AD and for tracking disease progression. The present study introduces three novel compounds, 4-[2-(2-benzoimidazolyl)ethenyl]- N , N -diethylbenzenamine (BF-126), 2-[(4-methylamino)phenyl]quinoline (BF-158), and 2-(4-aminophenyl)quinoline (BF-170), as candidate probes for in vivo imaging of tau pathology in the AD brain. When solutions of these compounds are injected intravenously into normal mice, these agents exhibit excellent brain uptake and rapid clearance from normal brain tissue. These compounds display relatively lower binding affinity to β-amyloid fibrils and higher binding affinity to tau fibrils, compared with previously reported probe BF-168. In neuropathological examination using AD brain sections, BF-126, BF-158, and BF-170 clearly visualize NFTs, neuropil threads, and paired helical filament-type neuritis. Autoradiography using 11 C-labeled BF-158 further demonstrated labeling of NFTs in AD brain sections. These findings suggest the potential usefulness of quinoline and benzimidazole derivatives for in vivo imaging of tau pathology in AD.
Key Questions in Marine Megafauna Movement Ecology
Publisher: Elsevier BV
Date: 06-2016
DOI: 10.1016/J.TREE.2016.02.015
Abstract: It is a golden age for animal movement studies and so an opportune time to assess priorities for future work. We assembled 40 experts to identify key questions in this field, focussing on marine megafauna, which include a broad range of birds, mammals, reptiles, and fish. Research on these taxa has both underpinned many of the recent technical developments and led to fundamental discoveries in the field. We show that the questions have broad applicability to other taxa, including terrestrial animals, flying insects, and swimming invertebrates, and, as such, this exercise provides a useful roadmap for targeted deployments and data syntheses that should advance the field of movement ecology.
Hierarchical State-Space Estimation of Leatherback Turtle Navigation Ability
Publisher: Public Library of Science (PLoS)
Date: 28-12-2010
Correction: Return Customers: Foraging Site Fidelity and the Effect of Environmental Variability in Wide-Ranging Antarctic Fur Seals
Publisher: Public Library of Science (PLoS)
Date: 06-06-2017
A water mass classification approach to tracking variability in the East Australian Current
Publisher: Frontiers Media SA
Date: 03-06-2020
Movements of southern elephant seals (Mirounga leonina) from Davis Base, Antarctica: combining population genetics and tracking data
Publisher: Springer Science and Business Media LLC
Date: 25-06-2022
DOI: 10.1007/S00300-022-03058-9
Abstract: Marine animals such as the southern elephant seal ( Mirounga leonina ) rely on a productive marine environment and are vulnerable to oceanic changes that can affect their reproduction and survival rates. Davis Base, Antarctica, acts as a moulting site for southern elephant seals that forage in Prydz Bay, but the mitochondrial haplotype ersity and natal source populations of these seals have not been characterized. In this study, we combined genetic and animal tracking data on these moulting seals to identify levels of mitochondrial haplotype ersity, natal source population, and movement behaviours during foraging and haul-out periods. Using partial sequences of the mitochondrial control region, we identified two major breeding mitochondrial lineages of seals at Davis Base. We found that the majority of the seals originated from breeding stocks within the South Atlantic Ocean and South Indian Ocean. One seal was grouped with the Macquarie Island breeding stock (South Pacific Ocean). The Macquarie Island population, unlike the other two stocks, is decreasing in size. Tracking data revealed long-distance foraging activity of the Macquarie Island seal around Crozet Islands. We speculate that changes to the Antarctic marine environment can result in a shift in foraging and movement strategies, which subsequently affects seal population growth rates.
Animal-Borne Acoustic Transceivers Reveal Patterns of at-Sea Associations in an Upper-Trophic Level Predator
Publisher: Public Library of Science (PLoS)
Date: 14-11-2012
Foraging movements of Leach's storm-petrelsOceanodroma leucorhoaduring incubation
Publisher: Wiley
Date: 18-03-2014
DOI: 10.1111/JAV.00361
In vivo visualization of donepezil binding in the brain of patients with Alzheimer's disease
Publisher: Wiley
Date: 04-2008
Imaging amyloid pathology in the living brain
Publisher: Bentham Science Publishers Ltd.
Date: 02-2008
Transmitting species‐interaction data from animal‐borne transceivers through Service Argos using Bluetooth communication
Publisher: Wiley
Date: 09-2014
Recent prey capture experience and dynamic habitat quality mediate short-term foraging site fidelity in a seabird
Publisher: The Royal Society
Date: 25-07-2018
Abstract: Foraging site fidelity allows animals to increase their efficiency by returning to profitable feeding areas. However, the mechanisms underpinning why animals ‘stay’ or ‘switch’ sites have rarely been investigated. Here, we explore how habitat quality and prior prey capture experience influence short-term site fidelity by the little penguin ( Eudyptula minor ). Using 88 consecutive foraging trips by 20 brooding penguins, we found that site fidelity was higher after foraging trips where environmental conditions were favourable, and after trips where prey capture success was high. When penguins exhibited lower site fidelity, the number of prey captures relative to the previous trip increased, suggesting that switches in foraging location were an adaptive strategy in response to low prey capture rates. Penguins foraged closer to where other penguins foraged on the same day than they did to the location of their own previous foraging site, and caught more prey when they foraged close together. This suggests that penguins aggregated flexibly when prey was abundant and accessible. Our results illustrate how foraging predators can integrate information about prior experience with contemporary information such as social cues. This gives insight into how animals combine information adaptively to exploit changing prey distribution in a dynamic environment.
Cost-effective mitigation strategies to reduce bycatch threats to cetaceans identified using return-on-investment analysis
Publisher: Wiley
Date: 16-10-2020
DOI: 10.1111/COBI.13418
Abstract: Globally, fisheries bycatch threatens the survival of many whale and dolphin species. Strategies for reducing bycatch can be expensive. Management is inclined to prioritize investment in actions that are inexpensive, but these may not be the most effective. We used an economic tool, return-on-investment, to identify cost-effective measures to reduce cetacean bycatch in the trawl, net, and line fisheries of Australia. We examined 3 management actions: spatial closures, acoustic deterrents, and gear modifications. We compared an approach for which the primary goal was to reduce the cost of bycatch reduction to fisheries with an approach that aims solely to protect whale and dolphin species. Based on cost-effectiveness and at a fine spatial resolution, we identified the management strategies across Australia that most effectively abated dolphin and whale bycatch. Although trawl-net modifications were the cheapest strategy overall, there were many locations where spatial closures were the most cost-effective solution, despite their high costs to fisheries, due to their effectiveness in reducing all fisheries interactions. Our method can be used to delineate strategies to reduce bycatch threats to mobile marine species across erse fisheries at relevant spatial scales to improve conservation outcomes.
Spatiotemporal modelling of marine movement data using Template Model Builder (TMB)
Publisher: Inter-Research Science Center
Date: 17-02-2017
DOI: 10.3354/MEPS12019
The neural correlates of driving performance identified using positron emission tomography
Publisher: Elsevier BV
Date: 07-2005
META-ANALYSIS OF ANIMAL MOVEMENT USING STATE-SPACE MODELS
Publisher: Wiley
Date: 11-2003
DOI: 10.1890/02-0670
North Atlantic blue and fin whales suspend their spring migration to forage in middle latitudes
Publisher: Public Library of Science (PLoS)
Date: 08-10-2013
Voxel-based analysis of amyloid positron emission tomography probe [C]BF-227 uptake in mild cognitive impairment and alzheimer's disease
Publisher: S. Karger AG
Date: 2010
DOI: 10.1159/000318754
Abstract: i Aim: /i To determine early brain changes in the distribution of an amyloid positron emission tomography (PET) probe, sup /sup C-labeled BF-227 or [ sup /sup C]BF-227, in order to accurately predict the progression of mild cognitive impairment (MCI) to Alzheimer’s disease (AD). i Patients and Methods: /i Amyloid plaque burden was evaluated using [ sup /sup C]BF-227 PET in AD, MCI and aged normal controls. A voxel-based analysis of [ sup /sup C]BF-227 PET images was performed to characterize the culprit brain lesion in patients with MCI who were destined to progress to AD, referred to as MCI converters (MCI-C). In addition, binding characteristics of BF-227 to amyloid deposits were examined using postmortem AD brain s les. i Results: /i Voxel-based statistical analyses of the BF-227 PET images clearly demonstrated an abnormal distribution of BF-227 mainly in the posterior association area in MCI-C and patients with AD. BF-227 uptake in the lateral temporal cortex was consistently observed in almost all MCI-C and patients with AD, and it distinguished MCI-C from MCI nonconverters. BF-227 binding strongly correlated with dense amyloid-β protein plaque density, but not with diffuse plaque density in the frontal cortex. i Conclusion: /i BF-227 uptake in the lateral temporal cortex is a reliable indicator that can be used for predicting prognosis in patients with MCI.
Incorrect likelihood methods were used to infer scaling laws of marine predator search behaviour
Publisher: Public Library of Science (PLoS)
Date: 05-10-2012
Methamphetamine- and 3,4-methylenedioxymethamphetamine-induced behavioral changes in histamine H3-receptor knockout mice
Publisher: Japanese Pharmacological Society
Date: 2009
DOI: 10.1254/JPHS.09024FP
Advances in molecular imaging for the diagnosis of dementia
Publisher: Informa Healthcare
Date: 29-07-2009
Discrete cortical regions associated with the musical beauty of major and minor chords
Publisher: Springer Science and Business Media LLC
Date: 06-2008
DOI: 10.3758/CABN.8.2.126
Neural correlates of perceptual difference between itching and pain: A human fMRI study
Publisher: Elsevier BV
Date: 07-2007
A multi-phase correlation search framework for mining non-taxonomic relations from unstructured text
Publisher: Springer Science and Business Media LLC
Date: 24-12-2012
Daily activity budgets reveal a quasi-flightless stage during non-breeding in Hawaiian albatrosses
Publisher: Springer Science and Business Media LLC
Date: 19-11-2014
Tracking of marine predators to protect Southern Ocean ecosystems
Publisher: Springer Science and Business Media LLC
Date: 18-04-2020
A novel approach to quantifying the spatiotemporal behavior of instrumented grey seals used to sample the environment
Publisher: Springer Science and Business Media LLC
Date: 08-07-2015
Regional Brain Activity and Performance During Car-Driving Under Side Effects of Psychoactive Drugs
Publisher: Springer Berlin Heidelberg
Date: 2009
Putting the behavior into animal movement modeling: Improved activity budgets from use of ancillary tag information
Publisher: Wiley
Date: 20-10-2016
DOI: 10.1002/ECE3.2530
Fine-scale movement behaviors of calopterygid damselflies are influenced by landscape structure: an experimental manipulation
Publisher: Wiley
Date: 03-2000
Inter‐ and intrasex habitat partitioning in the highly dimorphic southern elephant seal
Publisher: Wiley
Date: 29-01-2021
DOI: 10.1002/ECE3.7147
Movement responses to environment: fast inference of variation among southern elephant seals with a mixed effects model
Publisher: Wiley
Date: 24-12-2018
DOI: 10.1002/ECY.2566
Abstract: Like many species, movement patterns of southern elephant seals ( Mirounga leonina ) are being influenced by long‐term environmental change. These seals migrate up to 4,000 km from their breeding colonies, foraging for months in a variety of Southern Ocean habitats. Understanding how movement patterns vary with environmental features and how these relationships differ among in iduals employing different foraging strategies can provide insight into foraging performance at a population level. We apply new fast‐estimation tools to fit mixed effects within a random walk movement model, rapidly inferring among‐in idual variability in southern elephant seal environment–movement relationships. We found that seals making foraging trips to the sea ice on or near the Antarctic continental shelf consistently reduced speed and directionality (move persistence) with increasing sea‐ice coverage but had variable responses to chlorophyll a concentration, whereas seals foraging in the open ocean reduced move persistence in regions where circumpolar deep water shoaled. Given future climate scenarios, open‐ocean foragers may encounter more productive habitat but sea‐ice foragers may see reduced habitat availability. Our approach is scalable to large telemetry data sets and allows flexible combinations of mixed effects to be evaluated via model selection, thereby illuminating the ecological context of animal movements that underlie habitat usage.
Killer whale movements on the Norwegian shelf are associated with herring density
Publisher: Inter-Research Science Center
Date: 29-04-2021
DOI: 10.3354/MEPS13685
Abstract: Killer whales Orcinus orca have a cosmopolitan distribution with a broad diet ranging from fish to marine mammals. In Norway, killer whales are regularly observed feeding on overwintering Norwegian spring-spawning (NSS) herring Clupea harengus inside the fjords. However, their offshore foraging behavior and distribution are less well understood. In particular, it is not known to what degree they rely on the NSS herring stock when the herring move to deeper offshore waters. Satellite telemetry data from 29 male killer whales were analyzed to assess whether their offshore foraging behavior is linked to herring distribution. Unlike most marine predator-prey studies that use indirect proxies for prey abundance and distribution, our study utilized 2 herring density estimates based on (1) direct observations from acoustic trawl survey data and (2) simulations from a fully coupled ecosystem model. Mixed effects models were used to infer the effect of herring density and light intensity on whale movement patterns. Our results suggest that killer whales follow NSS herring over long distances along the coast from their inshore overwintering areas to offshore spawning grounds. All whales changed from fast, directed, to slow, non-directed movement when herring density increased, although in iduals had different propensities towards movement. Our data indicated that whales continue to feed on herring along the Norwegian shelf. We conclude that NSS herring constitute an important prey resource for at least some killer whales in the northeastern Atlantic, not only during the herring overwintering period, but also subsequently throughout the herring spawning migration.
Identifying nonproportionality of fisheryindependent survey data to estimate population trends and assess recovery potential for cusk (Brosme brosme)
Publisher: Canadian Science Publishing
Date: 03-2011
DOI: 10.1139/F10-165
Abstract: Cusk ( Brosme brosme ) was designated as “threatened” by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 2003, based on an estimated 93% decline between 1970 and 2001 from the Fisheries and Oceans Canada (DFO) Scotian Shelf summer bottom trawl survey index. We combined this index with a fishery-dependent longline index in a Bayesian surplus production state-space model to estimate population trends and the recovery potential of western Scotian Shelf cusk. We tested for index nonproportionality using a power curve function in the observation model and identified potential hyperdepletion for cusk in the trawl survey index. We estimate a 59% decline in cusk biomass between 1970 and 2001, and a 64% decline from 1970 to 2007. Although population projections indicate the current landing limit should lead to population recovery, robustness tests suggest the biomass projections and recovery time lines are overly optimistic. Simulations showed that incorporating multiple indices increases power to recapture model parameters and failure to account for index nonproportionality results in biased parameter estimates. We suggest that nonproportionality of fishery-independent indices must be considered when determining the population status of data-poor species.
Dispersal of southern elephant seals (Mirounga leonina) from Davis Base, Antarctica: Combining population genetics and tracking data
Publisher: Cold Spring Harbor Laboratory
Date: 27-11-2021
DOI: 10.1101/2021.11.26.470169
Abstract: Marine animals such as the southern elephant seal ( Mirounga leonina ) rely on a productive marine environment and are vulnerable to oceanic changes that can affect their reproduction and survival rates. Davis Base, Antarctica, acts as a moulting site for southern elephant seals that forage in Prydz Bay, but the genetic ersity and natal source populations of these seals has not been characterized. Determining the genetic ersity of moulting populations like this one provides essential information on seal dispersal, inter-population mixing, and foraging behaviours. In this study, we combined genetic and animal tracking data on these moulting seals to identify levels of genetic ersity, natal source population, and movement behaviours during foraging and haul-out periods. Using mitochondrial sequence data, we identified two major breeding lineages of seals at Davis Base. We found that the majority of the seals originated from breeding stocks within the South Atlantic Ocean and South Indian Ocean. One seal was grouped with the Macquarie Island breeding stock (South Pacific Ocean). The Macquarie Island population, unlike the other two stocks, is decreasing in size. Tracking data revealed long-distance foraging activity of the Macquarie Island seal around Crozet Islands. We speculate that changes to the Antarctic marine environment have resulted in a shift in foraging and dispersal strategies, which subsequently affects seal population growth rates. These findings have implications for conservation management plans aimed at improving the population status of the southern elephant seal.
The Future of Marine Animal Populations
Publisher: Wiley
Date: 08-10-2010
Assessing threats to species at risk using stage-structured state - Space models
Publisher: Wiley
Date: 07-2009
DOI: 10.1890/08-1699.1
Abstract: Population models are needed to assess the threats to species at risk and to evaluate alternative management actions. Data to support modeling is limited for many species at risk, and commonly used approaches generally assume stationary vital rates, a questionable assumption given widespread ecosystem change. We describe a modeling approach that can be applied to time series of length composition data to estimate vital rates and test for changes in these rates. Our approach uses stage-structured population models fit within a Bayesian state-space model. This approach simultaneously allows for both process and observation uncertainty, and it facilitates incorporating prior information on population dynamics and on the monitoring process. We apply these models to populations of winter skate (Leucoraja ocellata) that have been designated as "endangered" or "threatened." These models indicate that natural mortality has decreased for juveniles and increased for adults in these populations. The declines observed in these populations had been attributed to unsustainable rates of bycatch in fisheries for other groundfishes our analyses indicate that increased natural mortality of adults is also an important factor contributing to these declines. Adult natural mortality was positively related to grey seal (Halichoerus grypus) abundance, suggesting the hypothesis that increased adult mortality reflected increased predation by expanding grey seal herds. Population projections indicated that the threatened population would be expected to stabilize at a low level of abundance if all fishery removals were eliminated, but that the endangered population would likely continue to decline even in the absence of fishery removals. We note that time series of size distributions are available for most marine fish populations monitored by research surveys, and we suggest that a similar approach could be used to extract information from these time series in order to estimate mortality rates and changes in these rates.
Estimation and simulation of foraging trips in land-based marine predators
Publisher: Wiley
Date: 12-06-2017
DOI: 10.1002/ECY.1880
Abstract: The behavior of colony‐based marine predators is the focus of much research globally. Large telemetry and tracking data sets have been collected for this group of animals, and are accompanied by many empirical studies that seek to segment tracks in some useful way, as well as theoretical studies of optimal foraging strategies. However, relatively few studies have detailed statistical methods for inferring behaviors in central place foraging trips. In this paper we describe an approach based on hidden Markov models, which splits foraging trips into segments labeled as “outbound”, “search”, “forage”, and “inbound”. By structuring the hidden Markov model transition matrix appropriately, the model naturally handles the sequence of behaviors within a foraging trip. Additionally, by structuring the model in this way, we are able to develop realistic simulations from the fitted model. We demonstrate our approach on data from southern elephant seals ( Mirounga leonina ) tagged on Kerguelen Island in the Southern Ocean. We discuss the differences between our 4‐state model and the widely used 2‐state model, and the advantages and disadvantages of employing a more complex model.
A hierarchical Bayesian approach to multi-state mark-recapture
Publisher: Wiley
Date: 28-04-2009
Histamine H1 receptors in patients with Alzheimer's disease assessed by positron emission tomography
Publisher: Elsevier BV
Date: 08-2000
The importance of sample size in marine megafauna tagging studies
Publisher: Wiley
Date: 16-07-2019
DOI: 10.1002/EAP.1947
Abstract: Telemetry is a key, widely used tool to understand marine megafauna distribution, habitat use, behavior, and physiology however, a critical question remains: "How many animals should be tracked to acquire meaningful data sets?" This question has wide-ranging implications including considerations of statistical power, animal ethics, logistics, and cost. While power analyses can inform s le sizes needed for statistical significance, they require some initial data inputs that are often unavailable. To inform the planning of telemetry and biologging studies of marine megafauna where few or no data are available or where resources are limited, we reviewed the types of information that have been obtained in previously published studies using different s le sizes. We considered s le sizes from one to >100 in iduals and synthesized empirical findings, detailing the information that can be gathered with increasing s le sizes. We complement this review with simulations, using real data, to show the impact of s le size when trying to address various research questions in movement ecology of marine megafauna. We also highlight the value of collaborative, synthetic studies to enhance s le sizes and broaden the range, scale, and scope of questions that can be answered.
Atlantic salmon (Salmo salar) smolt and early post-smolt migration and survival inferred from multi-year and multi-stock acoustic telemetry studies in the Gulf of St. Lawrence, northwest Atlantic
Publisher: Oxford University Press (OUP)
Date: 04-12-2019
Abstract: The migration dynamics and inter-annual variation in early at-sea survival of Atlantic salmon (Salmo salar) smolts over 14 years of study are reported for four river populations located in the Gulf of St. Lawrence (Canada). Acoustically tagged smolts were monitored at three points along their migration from freshwater to the Labrador Sea, a migration extending more than 800 km at sea and a period of 2 months. A hierarchical state-space version of the Cormack–Jolly–Seber model was used to estimate apparent survival rates from incomplete acoustic detections at key points. There was a positive size-dependent probability of survival through the freshwater and estuary areas the odds of survival of a 16 cm smolt were 1.5–1.7 times higher than for a 13.5 cm smolt, length at tagging. Length adjusted (centred to the mean fork length of smolts during the study of 14.6 cm) survivals through the estuary and nearshore waters were estimated to range between 67 and 90% for the two river populations migrating through Chaleur Bay in contrast to lower survival estimates of 28–82% for the two populations from the neighbouring Miramichi Bay. Across the 14 years of study, survival estimates varied without trend for the populations of Chaleur Bay, but declined for the populations migrating through Miramichi Bay. Survival through the Gulf of St. Lawrence was variable but generally high among years and rivers, ranging from 96% day−1 to 99% day−1. Long term, replicated studies at multiple sites using acoustically tagged smolts can provide empirical data to examine hypotheses of the location and timing of factors contributing to smolt and post-smolt mortality of salmon at sea.
An economical custom-built drone for assessing whale health
Publisher: Frontiers Media SA
Date: 21-12-2017
Abundance estimates and habitat preferences of bottlenose dolphins reveal the importance of two gulfs in South Australia
Publisher: Springer Science and Business Media LLC
Date: 29-05-2019
DOI: 10.1038/S41598-019-44310-3
Abstract: Informed conservation management of marine mammals requires an understanding of population size and habitat preferences. In Australia, such data are needed for the assessment and mitigation of anthropogenic impacts, including fisheries interactions, coastal zone developments, oil and gas exploration and mining activities. Here, we present large-scale estimates of abundance, density and habitat preferences of southern Australian bottlenose dolphins ( Tursiops sp.) over an area of 42,438km 2 within two gulfs of South Australia. Using double-observer platform aerial surveys over four strata and mark-recapture distance s ling analyses, we estimated 3,493 (CV = 0.21 95%CI = 2,327-5,244) dolphins in summer/autumn, and 3,213 (CV = 0.20 95%CI = 2,151-4,801) in winter/spring of 2011. Bottlenose dolphin abundance and density was higher in gulf waters across both seasons (0.09-0.24 dolphins/km 2 ) compared to adjacent shelf waters (0.004–0.04 dolphins/km 2 ). The high densities of bottlenose dolphins in the two gulfs highlight the importance of these gulfs as a habitat for the species. Habitat modelling associated bottlenose dolphins with shallow waters, flat seafloor topography, and higher sea surface temperatures (SSTs) in summer/autumn and lower SSTs in winter/spring. Spatial predictions showed high dolphin densities in northern and coastal gulf sections. Distributional data should inform management strategies, marine park planning and environmental assessments of potential anthropogenic threats to this protected species.
Integrative modelling of animal movement: Incorporating in situ habitat and behavioural information for a migratory marine predator
Publisher: The Royal Society
Date: 07-01-2013
Abstract: A fundamental goal in animal ecology is to quantify how environmental (and other) factors influence in idual movement, as this is key to understanding responsiveness of populations to future change. However, quantitative interpretation of in idual-based telemetry data is h ered by the complexity of, and error within, these multi-dimensional data. Here, we present an integrative hierarchical Bayesian state-space modelling approach where, for the first time, the mechanistic process model for the movement state of animals directly incorporates both environmental and other behavioural information, and observation and process model parameters are estimated within a single model. When applied to a migratory marine predator, the southern elephant seal ( Mirounga leonina ), we find the switch from directed to resident movement state was associated with colder water temperatures, relatively short e bottom time and rapid descent rates. The approach presented here can have widespread utility for quantifying movement–behaviour ( ing or other)–environment relationships across species and systems.
Linking movement and dive data to prey distribution models: new insights in foraging behaviour and potential pitfalls of movement analyses
Publisher: Springer Science and Business Media LLC
Date: 23-03-2023
DOI: 10.1186/S40462-023-00377-2
Abstract: Animal movement data are regularly used to infer foraging behaviour and relationships to environmental characteristics, often to help identify critical habitat. To characterize foraging, movement models make a set of assumptions rooted in theory, for ex le, time spent foraging in an area increases with higher prey density. We assessed the validity of these assumptions by associating horizontal movement and ing of satellite-telemetered ringed seals ( Pusa hispida )—an opportunistic predator—in Hudson Bay, Canada, to modelled prey data and environmental proxies. Modelled prey biomass data performed better than their environmental proxies (e.g., sea surface temperature) for explaining seal movement however movement was not related to foraging effort. Counter to theory, seals appeared to forage more in areas with relatively lower prey ersity and biomass, potentially due to reduced foraging efficiency in those areas. Our study highlights the need to validate movement analyses with prey data to effectively estimate the relationship between prey availability and foraging behaviour.
Estimating fishery-scale rates of discard mortality using conditional reasoning
Publisher: Elsevier BV
Date: 08-2012
Recent advances in the development of amyloid imaging agents
Publisher: Bentham Science Publishers Ltd.
Date: 09-2007
Molecular imaging techniques for research on brain function using PET
Publisher: Japanese Pharmacological Society
Date: 2005
DOI: 10.1254/FPJ.126.347
Joint estimation over multiple individuals improves behavioural state inference from animal movement data
Publisher: Springer Science and Business Media LLC
Date: 08-02-2016
DOI: 10.1038/SREP20625
Abstract: State-space models provide a powerful way to scale up inference of movement behaviours from in iduals to populations when the inference is made across multiple in iduals. Here, I show how a joint estimation approach that assumes in iduals share identical movement parameters can lead to improved inference of behavioural states associated with different movement processes. I use simulated movement paths with known behavioural states to compare estimation error between nonhierarchical and joint estimation formulations of an otherwise identical state-space model. Behavioural state estimation error was strongly affected by the degree of similarity between movement patterns characterising the behavioural states, with less error when movements were strongly dissimilar between states. The joint estimation model improved behavioural state estimation relative to the nonhierarchical model for simulated data with heavy-tailed Argos location errors. When applied to Argos telemetry datasets from 10 Weddell seals, the nonhierarchical model estimated highly uncertain behavioural state switching probabilities for most in iduals whereas the joint estimation model yielded substantially less uncertainty. The joint estimation model better resolved the behavioural state sequences across all seals. Hierarchical or joint estimation models should be the preferred choice for estimating behavioural states from animal movement data, especially when location data are error-prone.
Coastal seascape variability in the intensifying East Australian Current Southern Extension
Publisher: Frontiers Media SA
Date: 21-09-2022
DOI: 10.3389/FMARS.2022.925123
Abstract: Coastal pelagic ecosystems are highly variable in space and time, with environmental conditions and the distribution of biomass being driven by complex processes operating at multiple scales. The emergent properties of these processes and their interactive effects result in complex and dynamic environmental mosaics referred to as “seascapes”. Mechanisms that link large-scale oceanographic processes and ecological variability in coastal environments remain poorly understood, despite their importance for predicting how ecosystems will respond to climate change. Here we assessed seascape variability along the path of the rapidly intensifying East Australian Current (EAC) Southern Extension in southeast Australia, a hotspot of ocean warming and ecosystem tropicalisation. Using satellite and in situ measures of temperature, salinity and current velocity coupled with contemporaneous measurements of pelagic biomass distribution from nine boat-based active acoustic surveys in five consecutive years, we investigated relationships between the physical environment and the distribution of pelagic biomass (zooplankton and fish) at multiple timescales. Survey periods were characterised by high variability in oceanographic conditions, with variation in coastal conditions influenced by meso-to-large scale processes occurring offshore, including the position and strength of eddies. Intra-annual variability was often of a similar or greater magnitude to inter-annual variability, suggesting highly dynamic conditions with important variation occurring at scales of days to weeks. Two seascape categories were identified being characterised by (A) warmer, less saline water and (B) cooler, more saline water, with the former indicating greater influence of the EAC on coastal processes. Warmer waters were also associated with fewer, deeper and less dense biological aggregations. As the EAC continues to warm and penetrate further south, it is likely that this will have substantial effects on biological activity in coastal pelagic ecosystems, including a potential reduction in the accessibility of prey aggregations to surface-feeding predators and to fisheries. These results highlight the import role of offshore oceanographic processes in driving coastal seascape variability and biological activity in a region undergoing rapid oceanic warming and ecological change.
Effects of a sedative antihistamine, D-chlorpheniramine, on regional cerebral perfusion and performance during simulated car driving
Publisher: Wiley
Date: 2008
DOI: 10.1002/HUP.909
Related Organisations
Related Funding Activities
Linkage Projects - Grant ID: LP160100162
Start Date: 12-2016
End Date: 09-2022
Amount: $213,445.00
Funder: Australian Research Council
View Funded Activity