ORCID Profile
0000-0002-6178-4211
Current Organisations
Universidade Federal do Rio Grande
,
Phillip Island Nature Parks
,
University of Tasmania
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Publisher: Public Library of Science (PLoS)
Date: 15-10-2014
Publisher: Public Library of Science (PLoS)
Date: 20-04-2012
Publisher: Oxford University Press (OUP)
Date: 2011
Publisher: Public Library of Science (PLoS)
Date: 13-08-2014
Publisher: Public Library of Science (PLoS)
Date: 13-02-2013
Publisher: The Royal Society
Date: 07-07-2015
Abstract: Life-history strategies have evolved in response to predictable patterns of environmental features. In practice, linking life-history strategies and changes in environmental conditions requires comparable space–time scales between both processes, a difficult match in most marine system studies. We propose a novel spatio-temporal and dynamic scale to explore marine productivity patterns probably driving reproductive timing in the inshore little penguin ( Eudyptula minor ), based on monthly data on ocean circulation in the Southern Ocean, Australia. In contrast to what occurred when considering any other fixed scales, little penguin's highly variable laying date always occurred within the annual peak of ocean productivity that emerged from our newly defined dynamic scale. Additionally, local sea surface temperature seems to have triggered the onset of reproduction, acting as an environmental cue informing on marine productivity patterns at our dynamic scale. Chlorophyll- a patterns extracted from this scale revealed that environment factors in marine ecosystems affecting breeding decisions are related to a much wider region than foraging areas that are commonly used in current studies investigating the link between animals' life history and their environment. We suggest that marine productivity patterns may be more predictable than previously thought when environmental and biological data are examined at appropriate scales.
Publisher: Public Library of Science (PLoS)
Date: 25-01-2011
Publisher: Public Library of Science (PLoS)
Date: 22-06-2015
Publisher: Springer Science and Business Media LLC
Date: 10-2010
Publisher: Public Library of Science (PLoS)
Date: 15-04-2015
Publisher: Public Library of Science (PLoS)
Date: 13-04-2012
Publisher: Public Library of Science (PLoS)
Date: 18-03-2015
Publisher: Elsevier BV
Date: 10-2015
Publisher: Public Library of Science (PLoS)
Date: 19-06-2014
Publisher: Public Library of Science (PLoS)
Date: 25-08-2015
Publisher: Public Library of Science (PLoS)
Date: 25-03-2015
Publisher: Wiley
Date: 30-06-2005
Publisher: Springer Science and Business Media LLC
Date: 05-04-2021
Publisher: Public Library of Science (PLoS)
Date: 28-10-2011
Publisher: Informa UK Limited
Date: 12-2002
DOI: 10.1071/MU02004
Publisher: Wiley
Date: 26-03-2021
DOI: 10.1002/ECE3.7431
Abstract: The extrinsic and intrinsic factors affecting differing reproductive strategies among populations are central to understanding population and evolutionary ecology. To evaluate whether in idual reproductive strategies responded to annual patterns in marine productivity and age‐related processes in a seabird we used a long term (2003–2013), a continuous dataset on nest occupancy and attendance at the colony by little penguins ( Eudyptula minor ) at Phillip Island (Victoria, Australia). We found that concurrent with a secondary annual peak of marine productivity, a secondary peak in colony attendance and nest occupancy was observed in Autumn (out of the regular breeding season in spring/summer) with in iduals showing mating‐like behavior. In iduals attending this autumn peak averaged 2.5 years older than those in iduals that exclusively bred during spring/summer. Rather than being a naïve response by younger and inexperienced birds misreading environmental cues, our data indicate that the autumn peak attendance is an earlier attempt to breed by older and more experienced penguins. Therefore, we provide strong support for the fundamental prediction of the life‐history theory of increasing investment in reproduction with age to maximize lifetime fitness as future survival prospects diminish and experience increases.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CP54825B
Abstract: Radical-directed dissociation of gas phase ions is emerging as a powerful and complementary alternative to traditional tandem mass spectrometric techniques for biomolecular structural analysis. Previous studies have identified that coupling of 2-[(2,2,6,6-tetramethylpiperidin-1-oxyl)methyl]benzoic acid (TEMPO-Bz) to the N-terminus of a peptide introduces a labile oxygen-carbon bond that can be selectively activated upon collisional activation to produce a radical ion. Here we demonstrate that structurally-defined peptide radical ions can also be generated upon UV laser photodissociation of the same TEMPO-Bz derivatives in a linear ion-trap mass spectrometer. When subjected to further mass spectrometric analyses, the radical ions formed by a single laser pulse undergo identical dissociations as those formed by collisional activation of the same precursor ion, and can thus be used to derive molecular structure. Mapping the initial radical formation process as a function of photon energy by photodissociation action spectroscopy reveals that photoproduct formation is selective but occurs only in modest yield across the wavelength range (300-220 nm), with the photoproduct yield maximised between 235 and 225 nm. Based on the analysis of a set of model compounds, structural modifications to the TEMPO-Bz derivative are suggested to optimise radical photoproduct yield. Future development of such probes offers the advantage of increased sensitivity and selectivity for radical-directed dissociation.
Publisher: Public Library of Science (PLoS)
Date: 09-10-2014
Publisher: Wiley
Date: 10-08-2012
Publisher: Elsevier BV
Date: 07-2015
Publisher: Public Library of Science (PLoS)
Date: 27-03-2012
Publisher: The Royal Society
Date: 06-2023
DOI: 10.1098/RSOS.220362
Abstract: While differences in foraging and reproductive success are well studied between seabird colonies, they are less understood at a smaller subcolony scale. Working with little penguins ( Eudyptula minor ) at Phillip Island, Australia, we used an automated penguin monitoring system and performed regular nest checks at two subcolonies situated 2 km apart during the 2015/2016 breeding seasons. We examined whether foraging and reproductive success differed between subcolonies. We used satellite data to examine how sea surface temperature, as environmental pressure, in the foraging regions from each subcolony influenced their foraging performance. In the pre-laying and incubation breeding stages, the birds from one subcolony had a lower foraging success than birds from the other. However, this pattern was reversed between the subcolonies in the guard and post-guard stages. Breeding success data from the two subcolonies from 2004–2018 showed that reproductive success and mean egg-laying had a negative relationship with sea surface temperature. We highlighted that variation in foraging and reproductive success can arise in subcolonies, likely due to different responses to environmental conditions and prey availability. Differences at the subcolony level can help refine, develop and improve appropriate species management plans for conserving a range of colonial central place seabirds.
Publisher: Wiley
Date: 06-07-2020
Publisher: Springer Science and Business Media LLC
Date: 04-2018
Publisher: Public Library of Science (PLoS)
Date: 24-04-2015
Publisher: American Association for the Advancement of Science (AAAS)
Date: 26-01-2018
Abstract: Until the past century or so, the movement of wild animals was relatively unrestricted, and their travels contributed substantially to ecological processes. As humans have increasingly altered natural habitats, natural animal movements have been restricted. Tucker et al. examined GPS locations for more than 50 species. In general, animal movements were shorter in areas with high human impact, likely owing to changed behaviors and physical limitations. Besides affecting the species themselves, such changes could have wider effects by limiting the movement of nutrients and altering ecological interactions. Science , this issue p. 466
Publisher: Cold Spring Harbor Laboratory
Date: 07-2023
DOI: 10.1101/2023.06.30.547199
Abstract: The COVID-19 pandemic and its lock-down measures have resulted in periods of reduced human activity, known as anthropause. While this period was expected to be favorable for the marine ecosystem, due to a probable reduction of pollution, shipping traffic, industrial activity and fishing pressure, negative counterparts such as the increased use of disposable plastic and reduced fisheries surveillance and enforcement could counterbalance these positive effects. Simultaneously, on-land pressure due to human disturbance and tourism should have drastically decreased, potentially benefiting land-based marine breeders such as seabirds. Thus, long-term datasets became crucial to differentiate between historical trends and any evident changes resulting from the anthropause. We analyzed 11 years of data on several biological parameters of little penguins ( Eudyptula minor ) from the Penguin Parade ®, a popular tourist attraction at Phillip Island, Australia. We investigated the impact of anthropogenic activities on penguin behavior during the breeding season measured by (1) distribution at sea, (2) colony attendance, (3) isotopic niche (4) chick meal mass, and (5) offspring investment against shipping traffic and number of tourists. The 2020 lock-downs resulted in a near absence of tourists visiting the Penguin Parade ®, which was otherwise visited by 800,000+ visitors on average per year. However, our long-term analysis showed no effect of the presence of visitors on little penguins’ activities. Surprisingly, the anthropause did not triggered any changes in maritime traffic intensity and distribution in the region. While we found significant inter- and intra-annual variations for most parameters, we detected a negative effect of marine traffic on the foraging efficiency. Our results suggest that environmental variations have a greater influence on the breeding behavior of little penguins compared to short-term anthropause events. Our long-term dataset was key to test whether changes in anthropogenic activities affected the wildlife during the COVID-19 pandemic. We found that marine traffic, but not tourist presence, negatively impact the foraging and provisioning behavior of little penguins.
Publisher: Elsevier BV
Date: 07-2010
Publisher: Springer Science and Business Media LLC
Date: 12-01-2007
Publisher: Elsevier BV
Date: 11-2007
Publisher: Public Library of Science (PLoS)
Date: 04-06-2013
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-02-2017
Abstract: The main hot spots of marine bio ersity are also the areas that are affected the most by climate and, potentially, fishing impacts.
Publisher: Wiley
Date: 24-05-2020
DOI: 10.1002/ECE3.6393
Publisher: Springer Science and Business Media LLC
Date: 13-08-2015
Publisher: Public Library of Science (PLoS)
Date: 25-03-2014
Publisher: Wiley
Date: 11-2009
DOI: 10.2193/2008-146
Publisher: Public Library of Science (PLoS)
Date: 19-07-2012
Publisher: Public Library of Science (PLoS)
Date: 13-11-2013
Publisher: Wiley
Date: 11-01-2019
DOI: 10.1111/GEB.12875
Publisher: Springer Science and Business Media LLC
Date: 20-07-2014
DOI: 10.1007/S00442-014-3018-3
Abstract: Competition for food resources can result in spatial and dietary segregation among in iduals from the same species. Few studies have looked at such segregations with the combined effect of sex and age in species with short foraging ranges. In this study we examined the 3D spatial use of the environment in a species with a limited foraging area. We equipped 26 little penguins (Eudyptula minor) of known age, sex, and breeding output with GPS (location) and accelerometer (body acceleration and e depth) loggers. We obtained dietary niche information from the isotopic analysis of blood tissue. We controlled for confounding factors of foraging trip length and food availability by s ling adults at guard stage when parents usually make one-day trips. We observed a spatial segregation between old (>11 years old) and middle-aged penguins (between 5 and 11 years old) in the foraging area. Old penguins foraged closer to the shore, in shallower water. Despite observing age-specific spatial segregation, we found no differences in the ing effort and foraging efficiency between age classes and sexes. Birds appeared to target similar prey types, but showed age-specific variation in their isotopic niche width. We hypothesize that this age-specific segregation was primarily determined by a "cohort effect" that would lead in iduals sharing a common life history (i.e. having fledged and dispersed around the same age) to forage preferentially together or to share similar foraging limitations.
Publisher: Wiley
Date: 28-11-2021
DOI: 10.1002/ESP.5284
Abstract: Changes in vegetation cover and dune mobility of Woolamai dune fields on the southeast coast of Australia were quantified based on a time series of aerial imagery (1939 to 2020). Results showed that the dune fields have shifted from nearly all bare sand (with % vegetation cover) to a new quasi‐equilibrium state, being almost fully stabilized by vegetation ( %) from 1939 to 2020. Three temporal stages of vegetation change were identified, namely: (I) early expansion over 1939–1975 (II) rapid growth from 1976 to 2010 and (III) recent ‘quasi‐equilibrium’ state in 2010–2020. In stage I, complex impacts of climate and human activities co‐existed with uncertainty of the dominant factor. In this early stage, vegetation growth was constrained to the low and sheltered areas, indicating the influence of topography. Rapid vegetation growth took place in 1976–2010 (stage II), during which a re‐vegetation programme combined with favourable climate conditions promoted vegetation growth. In the last decade (stage III), vegetation might have reached a new quasi‐equilibrium when the vegetation almost reached a maximum. The slight loss of vegetation could be attributed to weed control and an unfavourable climate for growth (drier and windier) in Woolamai dune fields. This study showed that variations in vegetation cover and dune mobility through time are not simply linked to a single factor but depend on the occurrence of multiple factors (e.g. topography, climate and human activities) that promote stability, or alternatively, mobility of the dune system. This research contributes to expanding our understanding of the complexity of the bio‐geomorphologic dynamics in dune fields. It also provides detailed observational evidence for the historical trajectory of vegetation expansion from the bare dune fields to a fully stabilized state, which can be used to verify and refine models for other similar dune sites.
Publisher: Public Library of Science (PLoS)
Date: 03-10-2014
Publisher: Wiley
Date: 14-08-2013
DOI: 10.1002/ETC.2303
Abstract: The authors hypothesized that the catastrophic annual molt of penguins (Sphenisciformes) would lead to reduced intrain idual variation of mercury concentrations in body feathers. While mean mercury concentrations varied significantly among 8 penguin species, intrain idual variability did not differ among species and was 3 times lower than values observed in other seabirds. The findings of the present study suggest that a single body feather collected at random per in idual can be adequate to estimate mercury exposure at the population level in penguins.
Publisher: Informa UK Limited
Date: 03-2003
DOI: 10.1071/MU02020
Publisher: Public Library of Science (PLoS)
Date: 22-01-2014
Publisher: Wiley
Date: 15-08-2023
DOI: 10.1002/PAN3.10520
Abstract: Culturally dependent human social behaviours involving artificial light usage can potentially affect light pollution patterns and thereby impact the night‐time ecology in populated areas, although to date this has not been examined globally. By analysing continuous (monthly), highly resolved, spatially explicit data on global night lights (Visible and Infrared Imaging Radiometer Suite–Day/Night Band‐VIIRS‐DNB 2014–2019) with circular statistical techniques, we evaluated whether macro‐cultural activities involving social aggregations and the use of artificial lights shape annual lighting patterns globally. Scheduled routines associated with cultural‐specific festivities appear to be important drivers of observed seasonal patterns in urban night‐time lights. For instance, the display of Christmas lights between Christmas and Epiphany Day celebrations (December–January) coincides with the annual peak in urban night‐time light intensity in Christian countries. Analogously, night celebrations during the Holy Month of Ramadam (from May to July) or the month‐long period of Karthika Masam (from October to November) fits with annual night light peaks in Muslim and Hindu countries. Annual peaks of urban light intensity in China and Vietnam also match with Chinese and Vietnamese (Tê't) New Year celebrations (January–February). In contrast, predominantly Buddhist countries, which do not have such prominent and prolonged celebrations involving artificial lights, show a relatively uniform distribution of night light peaks throughout the annual cycle. Social behaviour and sociocultural contexts help explain how people modify the global nightscape and contribute to light pollution globally. Understanding the cultural contexts responsible for peaks in artificial light usage is an important first step if humans are to mitigate any deleterious effects associated with global increases in night‐time light pollution. Read the free Plain Language Summary for this article on the Journal blog.
Publisher: Wiley
Date: 10-2011
DOI: 10.1890/11-0407.1
Abstract: Breeding animals face important time and energy constraints when caring for themselves and their offspring. For long-lived species, life-history theory predicts that parents should favor survival over current reproductive attempts, thus investing more into their own maintenance than the provisioning of their young. In seabirds, provisioning strategies may additionally be influenced by the distance between breeding sites and foraging areas, and offshore and inshore species should thus exhibit different strategies. Here, we examine the provisioning strategies of an inshore seabird using a long-term data set on more than 200 Little Penguins, Eudyptula minor. They alternated between two consecutive long and several short foraging trips all along chick rearing, a strategy almost never observed for inshore animals. Short trips allowed for regular provisioning of the chicks (high feeding frequency and larger meals), whereas long trips were performed when parent body mass was low and enabled them to rebuild their reserves, suggesting that adult body condition may be a key factor in initiating long trips. Inshore seabirds do use dual strategies of alternating short and long trips, but from our data, on a simpler and less flexible way than for offshore birds.
Publisher: Public Library of Science (PLoS)
Date: 21-11-2011
Publisher: Springer Science and Business Media LLC
Date: 06-02-2007
Publisher: Public Library of Science (PLoS)
Date: 15-05-2015
Publisher: Wiley
Date: 22-11-2011
Publisher: Public Library of Science (PLoS)
Date: 20-02-2012
Publisher: Public Library of Science (PLoS)
Date: 14-10-2015
Publisher: Public Library of Science (PLoS)
Date: 21-11-2012
Publisher: Public Library of Science (PLoS)
Date: 10-04-2012
Publisher: Elsevier BV
Date: 02-2007
Publisher: Public Library of Science (PLoS)
Date: 12-06-2013
Publisher: Wiley
Date: 11-12-2014
Publisher: Public Library of Science (PLoS)
Date: 05-10-2011
Publisher: Wiley
Date: 13-12-2021
DOI: 10.1002/ECM.1495
Abstract: Reproductive performance typically improves with age, reaching a plateau at middle age and subsequently declining in older age classes (senescing in iduals). Three potential non‐exclusive mechanisms can explain the improvement in reproductive performance with age: (1) selection (poor quality in iduals are removed from the population with increasing age), (2) constraint (in idual efficiency increases through experience), and (3) restraint (reproductive investment increases with age as the residual reproductive value decreases). While all three mechanisms received strong empirical support, few studies have aimed at teasing apart those hypotheses and understanding their underlying functioning. In little penguins ( Eudyptula minor ), we used a 19‐yr longitudinal dataset on breeding and foraging of more than 450 in iduals to investigate the effect of age on breeding success. We separated within‐in idual from among‐in idual age effects using state‐of‐the‐art statistical methods (within‐subject centering and population change decomposition). We then assessed whether within‐in idual changes in breeding resulted from ontogenetic changes in foraging performances, breeding phenology or access to mates and nest sites. Fidelity and assortative pairing explained the high correlation in male and female ages within a pair. Breeding performances followed a typical bell‐shaped curve with performance increasing up to 8 yr old, before reaching a plateau and subsequently declining after age 16. Both selection and within‐in idual processes occurred, although within‐in idual changes dominated differences in age‐dependent breeding success. The selective appearance had almost no effect (apart from ages 2–3), and selective disappearance mostly affected changes at old ages (above 16), although they were also responsible for the slight increase in reproductive performances from ages 5–8. Focusing on within‐in idual changes, birds exhibited higher performances at middle ages, with birds foraging better, laying earlier and changing partner and nest less often. Their reproductive investment did not vary with age for females and slightly decreased for males. This supports the constraint hypothesis but not the restraint one. Finally, the increase in breeding performances at young ages was explained by the age‐related increase in foraging performances during chick‐rearing and advancement of laying. In contrast, reproductive senescence was defined by a general decrease in bird performances.
Publisher: Elsevier BV
Date: 08-2015
Publisher: Public Library of Science (PLoS)
Date: 05-09-2012
Publisher: Oxford University Press (OUP)
Date: 07-2008
Publisher: Public Library of Science (PLoS)
Date: 30-11-2015
Publisher: Public Library of Science (PLoS)
Date: 26-04-2012
DOI: 10.1371/ANNOTATION/32C246EB-3B73-4410-A44C-B41DDAE11FC5
Publisher: Public Library of Science (PLoS)
Date: 24-08-2012
Publisher: Springer Science and Business Media LLC
Date: 18-04-2015
DOI: 10.1007/S00442-015-3294-6
Abstract: Marine animals forage in areas that aggregate prey to maximize their energy intake. However, these foraging 'hot spots' experience environmental variability, which can substantially alter prey availability. To survive and reproduce animals need to modify their foraging in response to these prey shifts. By monitoring their inter-annual foraging behaviours, we can understand which environmental variables affect their foraging efficiency, and can assess how they respond to environmental variability. Here, we monitored the foraging behaviour and isotopic niche of little penguins (Eudyptula minor), over 3 years (2008, 2011, and 2012) of climatic and prey variability within Port Phillip Bay, Australia. During drought (2008), penguins foraged in close proximity to the Yarra River outlet on a predominantly anchovy-based diet. In periods of heavy rainfall, when water depth in the largest tributary into the bay (Yarra River) was high, the total distance travelled, maximum distance travelled, distance to core-range, and size of core- and home-ranges of penguins increased significantly. This larger foraging range was associated with broad dietary ersity and high reproductive success. These results suggest the increased foraging range and dietary ersity of penguins were a means to maximize resource acquisition rather than a strategy to overcome local depletions in prey. Our results demonstrate the significance of the Yarra River in structuring predator-prey interactions in this enclosed bay, as well as the flexible foraging strategies of penguins in response to environmental variability. This plasticity is central to the survival of this small-ranging, resident seabird species.
Publisher: Springer Science and Business Media LLC
Date: 24-05-2013
DOI: 10.1038/SREP01884
No related grants have been discovered for Andre Chiaradia.