ORCID Profile
0000-0002-1085-4582
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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) | Ecosystem Function | Other Biological Sciences | Global Change Biology | Phycology | Marine And Estuarine Ecology (Incl. Marine Ichthyology) | Population Ecology | Ecology | Environmental Science and Management | Population And Ecological Genetics | Genetics | Environmental Rehabilitation (excl. Bioremediation) | Life Histories (Incl. Population Ecology) | Conservation And Biodiversity |
ANZSRC Socio-Economic Objective (SEO)
Living resources (incl. impacts of fishing on non-target species) | Control of pests and exotic species | Integrated (ecosystem) assessment and management | Climate change | Effects of Climate Change and Variability on Australia (excl. Social Impacts) | Coastal and Estuarine Flora, Fauna and Biodiversity | Rehabilitation of Degraded Coastal and Estuarine Environments | Marine Flora, Fauna and Biodiversity | Coastal and Estuarine Water Management | Ecosystem Assessment and Management of Marine Environments
Related Links
Publications
Anchors aweigh: Fragment generation of invasive Caulerpa taxifolia by boat anchors and its resistance to desiccation
Publisher: Elsevier BV
Date: 10-2007
A comparative assessment of the activity and structure of phlorotannins from the brown seaweed Carpophyllum flexuosum
Publisher: Elsevier BV
Date: 2018
Vulnerabilities and adaptation of ports to climate change
Publisher: Informa UK Limited
Date: 09-2013
Investigating biophysical linkages at tidal energy candidate sites: a case study for combining environmental assessment and resource characterisation
Publisher: Elsevier BV
Date: 10-2020
Dataset for concurrent echosounder and ADCP measurements at a tidal energy candidate site in Australia
Publisher: Elsevier BV
Date: 08-2020
Chemical microenvironments within macroalgal assemblages: Implications for the inhibition of kelp recruitment by turf algae
Publisher: Wiley
Date: 13-02-2019
DOI: 10.1002/LNO.11138
Abstract: Kelp forests around the world are under increasing pressure from anthropogenic stressors. A widespread consequence is that in many places, complex and highly productive kelp habitats have been replaced by structurally simple and less productive turf algae habitats. Turf algae habitats resist re‐establishment of kelp via recruitment inhibition however, little is known about the specific mechanisms involved. One potential factor is the chemical environment within the turf algae and into which kelp propagules settle and develop. Using laboratory trials, we illustrate that the chemical microenvironment (O 2 concentration and pH) 0.0–50 mm above the substratum within four multispecies macroalgal assemblages (including a turf‐sediment assemblage and an Ecklonia radiata kelp‐dominated assemblage) are characterized by elevated O 2 and pH relative to the surrounding seawater. Notably however, O 2 and pH were significantly higher within turf‐sediment assemblages than in kelp‐dominated assemblages, and at levels that have previously been demonstrated to impair the photosynthetic or physiological capacity of kelp propagules. Field observations of the experimental assemblages confirmed that recruitment of kelp was significantly lower into treatments with dense turf algae than in the kelp‐dominated assemblages. We demonstrate differences between the chemical microenvironments of kelp and turf algae assemblages that correlate with differences in kelp recruitment, highlighting how degradation of kelp habitats might result in the persistence of turf algae habitats and the localized absence of kelp.
Kelp nursery optimisation: density-dependent effects in early life-cycle stages of Ecklonia radiata (Laminariales)
Publisher: Walter de Gruyter GmbH
Date: 24-10-2022
Abstract: Kelp aquaculture is an emerging industry outside of Asia. To be successful, this industry requires a reliable production of seedstock, the optimisation of which greatly benefits from a detailed physiological understanding of the microscopic life-cycle stages of the cultured species. This study investigated the impact of six zoospore densities (10–278 mm −2 ) on the subsequent development of Ecklonia radiata gametophytes and sporophytes. The results showed that germination rates and sex ratio were unaffected by initial zoospore density, but there were significant effects on gametophyte size and sporophyte production. After two weeks, female gametophytes were largest at an initial zoospore density of 40 mm −2 while male gametophytes grew largest at densities below 40 mm −2 , but after four weeks gametophyte size showed a negative relationship with initial zoospore density. Significantly more sporophytes developed at initial zoospore densities below 40 in iduals mm −2 and no sporophytes were observed at the highest density (271 zoospores mm −2 ). These results clearly show the importance of initial zoospore density in optimising the nursery stage of kelp aquaculture.
Reduced performance of native infauna following recruitment to a habitat-forming invasive marine alga
Publisher: Springer Science and Business Media LLC
Date: 22-10-2008
DOI: 10.1007/S00442-008-1181-0
Abstract: Despite well-documented negative impacts of invasive species on native biota, evidence for the facilitation of native organisms, particularly by habitat-forming invasive species, is increasing. However, most of these studies are conducted at the population or community level, and we know little about the in idual fitness consequences of recruitment to habitat-forming invasive species and, consequently, whether recruitment to these habitats is adaptive. We determined the consequences of recruitment to the invasive green alga Caulerpa taxifolia on the native soft-sediment bivalve Anadara trapezia and nearby unvegetated sediment. Initially, we documented the growth and survivorship of A. trapezia following a natural recruitment event, to which recruitment to C. taxifolia was very high. After 12 months, few clams remained in either habitat, and those that remained showed little growth. Experimental manipulations of recruits demonstrated that all performance measures (survivorship, growth and condition) were significantly reduced in C. taxifolia sediments compared to unvegetated sediments. Exploration of potential mechanisms responsible for the reduced performance in C. taxifolia sediments showed that water flow and water column dissolved oxygen (DO) were significantly reduced under the canopy of C. taxifolia and that sediment anoxia was significantly higher and sediment sulphides greater in C. taxifolia sediments. However, phytoplankton abundance (an indicator of food supply) was significantly higher in C. taxifolia sediments than in unvegetated ones. Our results demonstrate that recruitment of native species to habitat-forming invasive species can reduce growth, condition and survivorship and that studies conducted at the community level may lead to erroneous conclusions about the impacts of invaders and should include studies on life-history traits, particularly juveniles.
CHEMICAL DEFENSE IN A MARINE ALGA: HERITABILITY AND THE POTENTIAL FOR SELECTION BY HERBIVORES
Publisher: Wiley
Date: 11-2004
DOI: 10.1890/03-4041
Thermal performance curves identify seasonal and site‐specific variation in the development of Ecklonia radiata (Phaeophyceae) gametophytes and sporophytes
Publisher: Wiley
Date: 28-10-2023
DOI: 10.1111/JPY.13406
Native turncoats and indirect facilitation of species invasions
Publisher: The Royal Society
Date: 24-01-2018
Abstract: At local scales, native species can resist invasion by feeding on and competing with would-be invasive species. However, this relationship tends to break down or reverse at larger scales. Here, we consider the role of native species as indirect facilitators of invasion and their potential role in this ersity-driven ‘invasion paradox’. We coin the term ‘native turncoats’ to describe native facilitators of non-native species and identify eight ways they may indirectly facilitate species invasion. Some are commonly documented, while others, such as indirect interactions within competitive communities, are largely undocumented in an invasion context. Therefore, we use models to evaluate the likelihood that these competitive interactions influence invasions. We find that native turncoat effects increase with the number of resources and native species. Furthermore, our findings suggest the existence, abundance and effectiveness of native turncoats in a community could greatly influence invasion success at large scales.
Biogeographic comparisons of the traits and abundance of an invasive crab throughout its native and invasive ranges
Publisher: Springer Science and Business Media LLC
Date: 22-01-2013
Structural complexity facilitates accumulation and retention of fragments of the invasive alga, Caulerpa taxifolia
Publisher: Elsevier BV
Date: 04-2009
Kelp patch size and density influence secondary productivity and diversity of epifauna
Publisher: Wiley
Date: 19-12-2019
DOI: 10.1111/OIK.06585
Abstract: Habitat‐forming ecosystem engineers are the foundation of many marine ecosystems where they support erse and productive food‐webs. A reduction in their patch size or density may affect the productivity, bio ersity and stability of these ecosystems. We determined the effects of different densities and patch sizes of Ecklonia radiata (the dominant kelp in southern Australia) on the secondary productivity, species richness, ersity and community structure of understory epifaunal invertebrates and how associated environmental covariates modified by kelp affected those patterns. We assessed sub‐canopy epifauna across 28 artificial reefs with transplanted E. radiata consisting of seven different patch sizes (0.12–7.68 m 2 ) crossed with four kelp densities (0–16 kelp m −2 ) over two years. Epifaunal secondary productivity associated with both natural algal and standardised rope fibre habitats decreased with patch size and was elevated when kelp was absent, however, it was also high in natural habitat when there was a high density of kelp. Epifaunal productivity was positively associated with sub‐canopy light and water flow but negatively associated with the biomass of the dominant understory alga, Ulva sp. Epifaunal ersity declined with a reduction in reef size as did richness which correlated with a loss of algal species richness. Community structure of epifauna also differed between small and large reefs, between reefs with and without kelp, between rope habitats at the centre and at the edge of reefs, and within natural habitat between reefs supporting high and low densities of kelp. Overall, these results indicate complex effects of E. radiata decline on epifaunal communities, with high secondary productivity associated with dense kelp stands, but also areas without kelp that are dominated by turf algae. While the loss of standing kelp from rocky reefs may result in declines in epifaunal bio ersity, where turf algae replaces kelp, the reefs may still support high secondary productivity.
Non-natives: 141 scientists object
Publisher: Springer Science and Business Media LLC
Date: 07-2011
DOI: 10.1038/475036A
Habitat associated differences in temperate sponge assemblages:
Publisher: Elsevier BV
Date: 06-1997
Phenotypic plasticity and biogeographic variation in physiology of habitat-forming seaweed: response to temperature and nitrate
Publisher: Wiley
Date: 13-09-2015
DOI: 10.1111/JPY.12330
Abstract: Southeastern Australian waters are warming at nearly four times the global average rate (~0.7°C · century(-1) ) driven by strengthening incursions of the warm oligotrophic East Australian Current. The growth rate hypothesis (GRH) predicts that nutrient depletion will impact more severely on seaweeds at high latitudes with compressed growth seasons. This study investigates the effects of temperature and nutrients on the ecophysiology of the habitat-forming seaweed Phyllospora comosa in a laboratory experiment using temperature (12°C, 17°C, 22°C) and nutrient (0.5, 1.0, 3.0 μM NO3 (-) ) scenarios representative of observed variation among geographic regions. Changes in growth, photosynthetic characteristics (via chlorophyll fluorescence), pigment content, tissue chemistry (δ(13) C, % C, % N, C:N) and nucleic acid characteristics (absolute RNA and DNA, RNA:DNA ratios) were determined in seaweeds derived from cool, high-latitude and warm, low-latitude portions of the species' range. Performance of P. comosa was unaffected by nitrate availability but was strongly temperature-dependent, with photosynthetic efficiency, growth, and survival significantly impaired at 22°C. While some physiological processes (photosynthesis, nucleic acid, and accessory pigment synthesis) responded rapidly to temperature, others (C/N dynamics, carbon concentrating processes) were largely invariant and biogeographic variation in these characteristics may only occur through genetic adaptation. No link was detected between nutrient availability, RNA synthesis and growth, and the GRH was not supported in this species. While P. comosa at high latitudes may be less susceptible to oligotrophy than predicted by the GRH, warming water temperatures will have deleterious effects on this species across its range unless rapid adaptation is possible.
Differences in soft-sediment macrobenthic assemblages invaded by Caulerpa taxifolia compared to uninvaded habitats
Publisher: Inter-Research Science Center
Date: 07-04-2009
DOI: 10.3354/MEPS07926
Resilience and stability of kelp forests: The importance of patch dynamics and environment-engineer feedbacks
Publisher: Public Library of Science (PLoS)
Date: 25-01-2019
The role of recreational activities in creating fragments of invasive Caulerpa taxifolia
Publisher: Elsevier BV
Date: 07-2009
Local densities and habitat preference of the critically endangered spotted handfish (Brachionichthys hirsutus): Large scale field trial of GPS parameterised underwater visual census and diver attache
Publisher: Public Library of Science (PLoS)
Date: 13-08-2018
Patch size and density of canopy-forming kelp modify influences of ecosystem engineering on understorey algal and sessile invertebrate assemblages
Publisher: Inter-Research Science Center
Date: 12-12-2019
DOI: 10.3354/MEPS13155
Ecosystem engineering by a canopy‐forming kelp facilitates the recruitment of native oysters
Publisher: Wiley
Date: 27-08-2019
DOI: 10.1111/REC.13019
A strategic review and research roadmap for offshore seaweed aquaculture—A case study from southern Australia
Publisher: Wiley
Date: 22-01-2023
DOI: 10.1111/RAQ.12788
Abstract: Global seaweed aquaculture production has more than tripled since 2002 and is dominated by Asian countries with farming operations that typically occur in relatively wave‐protected, nearshore areas. To meet future demand, production must move to “non‐traditional” regions and into less contested waters offshore. However, the technological complexities and uncertainties in the performance of seaweed cultivated in high‐energy offshore environments are substantial and must be overcome. Here, we identify knowledge gaps and suggest a research roadmap to inform the advancement of a commercial offshore seaweed aquaculture industry using southern Australian species as case studies: (1) Durvillaea spp. (order Fucales) (2) four kelps (order Laminariales) and (3) the rhodophyte Asparagopsis . These groups lie along a spectrum of commercial viability and readiness for offshore aquaculture, and key knowledge gaps are cultivation technology and the suitability to offshore conditions. Cultivation of Durvillaea is restricted by a low level of biological and technical understanding, but there is high market potential and readiness. For laminarian kelps, commercial production in nearshore conditions is already occurring elsewhere, which make them the most likely candidate for offshore cultivation in the medium term. Asparagopsis is least suited to offshore conditions, with substantial gaps in general cultivation knowledge, and its cultivation is likely to be restricted to land‐based systems or relatively sheltered nearshore waters. The knowledge gaps identified here will inform research and development programs to advance offshore seaweed aquaculture in southern Australia and globally.
A gastropod’s induced behavioral and morphological responses to invasive Carcinus maenas in Australia indicate a lack of novelty advantage
Publisher: Springer Science and Business Media LLC
Date: 13-01-2013
A comparison with natural particles reveals a small specific effect of PVC microplastics on mussel performance
Publisher: Elsevier BV
Date: 11-2020
Cost of chemical defence in the red alga Delisea pulchra
Publisher: Wiley
Date: 17-02-2006
Biogeographic variation in temperature drives performance of kelp gametophytes during warming
Publisher: Inter-Research Science Center
Date: 22-10-2014
DOI: 10.3354/MEPS10916
Environmental correlates of phenotypic variation: Do variable tidal regimes influence morphology in intertidal seaweeds?
Publisher: Wiley
Date: 13-09-2015
DOI: 10.1111/JPY.12329
Abstract: Seaweed morphology is often shaped by the hydrodynamic environment. However, exposure to air at low tide represents an additional factor potentially affecting the morphology of intertidal species. Here, we examined the relationships between the morphology of Hormosira banksii, an important intertidal habitat-forming seaweed in southern Australia, and environmental factors across multiple spatial scales around the island of Tasmania, Australia. Tasmania is surrounded by a erse coastline with differences in wave exposure, tidal parameters, and temperature. We s led Hormosira from four regions (100s km apart), three sites (10s km apart) within each region, and two zones (meters apart eulittoral and sublittoral) at each site, and measured multiple morphological variables to test for differences in morphology at those different spatial scales. Thirteen environmental variables reflecting wave exposure, tidal conditions, and temperature for each site were generated to assess the relationship between Hormosira morphology and environmental variation. Morphology varied at all spatial scales examined. Most notably, north coast in iduals had a distinct morphology, generally having smaller vesicles and shorter fronds, compared to other regions. Tidal conditions were the main environmental factors separating north coast sites from other sites and tidal regime was identified as the best predictor of morphological differences between regions. In contrast to other studies, we found little evidence that wave exposure was associated with morphological variation. Overall, our study emphasizes the role of tidal conditions, associated with emersion stress during low tide, in affecting the morphology of intertidal seaweeds.
A comparative assessment of microwave assisted (MAE) and conventional solid-liquid (SLE) techniques for the extraction of phloroglucinol from brown seaweed
Publisher: Elsevier BV
Date: 04-2017
Positive versus negative effects of an invasive ecosystem engineer on different components of a marine ecosystem
Publisher: Wiley
Date: 30-10-2012
Thinning of kelp canopy modifies understory assemblages: the importance of canopy density
Publisher: Inter-Research Science Center
Date: 06-11-2014
DOI: 10.3354/MEPS10964
Density-dependent sea urchin grazing: differential removal of species, changes in community composition and alternative community states
Publisher: Inter-Research Science Center
Date: 2005
DOI: 10.3354/MEPS298143
Habitat provided by native species facilitates higher abundances of an invader in its introduced compared to native range
Publisher: Springer Science and Business Media LLC
Date: 14-04-2020
DOI: 10.1038/S41598-020-63429-2
Abstract: The impacts invasive species have on bio ersity and ecosystem function globally have been linked to the higher abundances they often obtain in their introduced compared to native ranges. Higher abundances of invaders in the introduced range are often explained by a reduction in negative species interactions in that range, although results are equivocal. The role of positive interactions in explaining differences in the abundance of invaders between native and invasive ranges has not been tested. Using biogeographic surveys, we showed that the rocky shore porcelain crab, Petrolisthes elongatus , was ~4 times more abundant in its introduced (Tasmania, Australia) compared to its native (New Zealand) range. The habitat of these crabs in the invaded range (underside of intertidal boulders) was extensively covered with the habitat-forming tubeworm Galeolaria caespitosa . We tested whether the habitat provided by the tubeworm facilitates a higher abundance of the invasive crab by creating mimics of boulders with and without the tubeworm physical structure and measured crab colonisation into these habitats at three sites in both Tasmania and New Zealand. Adding the tubeworm structure increased crab abundance by an average of 85% across all sites in both ranges. Our intercontinental biogeographic survey and experiment demonstrate that native species can facilitate invader abundance and that positive interactions can be important drivers of invasion success.
Native species behaviour mitigates the impact of habitat-forming invasive seaweed
Publisher: Springer Science and Business Media LLC
Date: 30-03-2010
DOI: 10.1007/S00442-010-1608-2
Abstract: Habitat-forming invasive species cause large, novel changes to the abiotic environment. These changes may elicit important behavioural responses in native fauna, yet little is known about mechanisms driving this behaviour and how such trait-mediated responses influence the fitness of native species. Low dissolved oxygen is a key abiotic change created by the habitat-forming invasive seaweed, Caulerpa taxifolia, which influences an important behavioural response (burrowing depth) in the native infaunal bivalve Anadara trapezia. In Caulerpa-colonised areas, Anadara often emerged completely from the sediment, and we experimentally demonstrate that water column hypoxia beneath the Caulerpa canopy is the mechanism instigating this "pop-up" behaviour. Importantly, pop-up in Caulerpa allowed similar survivorship to that in unvegetated sediment however, when we prevented Anadara from popping-up, they suffered >50% mortality in just 1 month. Our findings not only highlight the substantial environmental alteration by Caulerpa, but also an important role for the behaviour of native species in mitigating the effects of habitat-forming invasive species.
Density‐dependence and seasonal variation in reproductive output and sporophyte production in the kelp, Ecklonia radiata
Publisher: Wiley
Date: 17-11-2021
DOI: 10.1111/JPY.13214
Abstract: The kelp, Ecklonia radiata , is an abundant subtidal ecosystem engineer in southern Australia. Density‐dependent changes in the abiotic environment engineered by Ecklonia may feedback to affect reproduction and subsequent recruitment. Here, we examined: 1) how the reproductive capacity of Ecklonia in iduals in the field (zoospores released · mm −2 reproductive tissue) varied with adult density and time, and 2) how the recruitment of microscopic gametophytes and sporophytes was influenced by zoospore density at two times. Zoospore production did not vary with adult density, with only one month out of ten s led over a 2‐y period showing a significant effect of density. However, zoospore production varied hugely over time, being generally highest in mid‐autumn and lowest in mid‐late summer. There were strong effects of initial zoospore density on gametophyte and sporophyte recruitment with both a minimum and an optimum zoospore density for sporophyte recruitment, but these varied in time. Almost no sporophytes developed when initial zoospore density was .5 · mm −2 in spring or .5 · mm −2 in winter with optimum densities of 90‐355 · mm −2 in spring and 21‐261 · mm −2 in winter, which resulted in relatively high recruitment of 4‐7 sporophytes · mm −2 . Sporophyte recruitment declined at initial zoospore densities · mm −2 in spring and · mm −2 in winter and was zero at very high zoospore densities. These findings suggest that although adult Ecklonia density does not affect per‐capita zoospore production, because there is a minimum zoospore density for sporophyte production, a decline in population‐level output could feedback to impact recruitment.
Intrinsic factors influence the attachment of fragments of the green alga Caulerpa filiformis
Publisher: Elsevier BV
Date: 12-2007
Larval settlement preference of a native bivalve: the influence of an invasive alga versus native substrata
Publisher: Inter-Research Science Center
Date: 05-11-2009
DOI: 10.3354/AB00196
Facilitation of an invader by a native habitat‐former increases along interacting gradients of environmental stress
Publisher: Wiley
Date: 11-03-2020
DOI: 10.1002/ECY.2961
Abstract: Native habitat-forming species can facilitate invasion by reducing environmental stress or consumer pressure. However, the intensity of one stressor along a local gradient may differ when expanding the scale of observation to encompass major variations in background environmental conditions. In this study, we determined how facilitation of the invasive porcelain crab, Petrolisthes elongatus, by the native tube-forming serpulid, Galeolaria caespitosa, varied with environmental gradients at local (tidal height) and larger (wave exposure) spatial scales. G. caespitosa constructs a complex calcareous matrix on the underside of intertidal boulders and we predicted that its positive effects on P. elongatus density would increase in intensity with shore height and be stronger at wave-sheltered than wave-exposed locations. To test these predictions, we conducted two experiments. First, we determined the effects of serpulid presence (boulders with live or dead serpulid matrix vs. bare boulders) at six shore heights that covered the intertidal distribution of P. elongatus. Second, we determined the effects of serpulid presence (present vs. absent), shore height (high vs. low) and wave exposure (sheltered vs. exposed) on crabs across six locations within the invaded range in northern Tasmania, Australia. In Experiment 1, the presence of serpulids (either dead or alive) enhanced P. elongatus densities at all shore heights, with facilitation intensity (as determined by a relative interaction index RII) tending to increase with shore height. In Experiment 2, serpulids facilitated P. elongatus across shore heights and wave exposures, although crab densities were lower at high shore levels of wave-sheltered locations. However, the intensity of crab facilitation by serpulids was greater on wave-sheltered than on wave-exposed shores, but only at the high shore level. This study demonstrates that local effects of native habitat-formers on invasive species are dependent on prevailing environmental conditions at larger spatial scales and that, under more stressful conditions, invaders become increasingly reliant on positive interactions with native habitat-formers. Increased strength of local-scale facilitation by native species, d ening broader scale variations in environmental stressors, could enhance the ability of invasive species to establish self-sustaining populations in the invaded range.
Related Organisations
No related organisations have been discovered for Jeffrey Wright.
Related Funding Activities
Discovery Projects - Grant ID: DP1096573
Start Date: 06-2010
End Date: 06-2015
Amount: $275,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0211238
Start Date: 03-2002
End Date: 12-2005
Amount: $227,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP130101113
Start Date: 06-2013
End Date: 12-2017
Amount: $325,000.00
Funder: Australian Research Council
View Funded ActivityLinkage - International - Grant ID: LX0989775
Start Date: 2009
End Date: 04-2010
Amount: $60,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP200200220
Start Date: 06-2022
End Date: 06-2025
Amount: $643,998.00
Funder: Australian Research Council
View Funded Activity