ORCID Profile
0000-0002-9871-7338
Current Organisation
Southern Cross University
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Inorganic Geochemistry | Biological Oceanography | Geochemistry | Chemical Oceanography
Ecosystem Adaptation to Climate Change | Ecosystem Assessment and Management of Coastal and Estuarine Environments |
Publisher: Elsevier BV
Date: 08-2014
Publisher: Wiley
Date: 30-11-2020
DOI: 10.1111/GCB.15446
Abstract: Terrestrial ecosystems emit large quantities of biogenic volatile organic compounds (BVOCs), many of which play important roles in abiotic stress responses, pathogen and grazing defences, inter‐ and intra‐species communications, and climate regulation. Conversely, comparatively little is known about the ersity and functional potential of BVOCs produced in the marine environment, especially in highly productive coral reefs. Here we describe the first ‘volatilomes’ of two common reef‐building corals, Acropora intermedia and Pocillopora damicornis , and how the functional potential of their gaseous emissions is altered by heat stress events that are driving rapid deterioration of coral reef ecosystems worldwide. A total of 87 BVOCs were detected from the two species and the chemical richness of both coral volatilomes—particularly the chemical classes of alkanes and carboxylic acids—decreased during heat stress by 41% and 62% in A. intermedia and P. damicornis , respectively. Across both coral species, the abundance of in idual compounds changed significantly during heat stress, with the majority ( %) significantly decreasing compared to control conditions. Additionally, almost 60% of the coral volatilome (or 52 BVOCs) could be assigned to four key functional groups based on their activities in other species or systems, including stress response, chemical signalling, climate regulation and antimicrobial activity. The total number of compounds assigned to these functions decreased significantly under heat stress for both A. intermedia (by 35%) and P. damicornis (by 64%), with most dramatic losses found for climatically active BVOCs in P. damicornis and antimicrobial BVOCs in A. intermedia . Together, our observations suggest that future heat stress events predicted for coral reefs will reduce the ersity, quantity and functional potential of BVOCs emitted by reef‐building corals, potentially further compromising the healthy functioning of these ecosystems.
Publisher: Springer Science and Business Media LLC
Date: 27-12-2016
DOI: 10.1007/S00216-016-0141-5
Abstract: Dimethylsulfoniopropionate (DMSP) in scleractinian coral is usually analysed indirectly as dimethylsulfide (DMS) using gas chromatography (GC) with a sulfur-specific detector. We developed a headspace GC method for mass spectral analysis of DMSP in branching coral where hexa-deuterated DMSP (d
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/EN14258
Abstract: Environmental contextDimethylated sulfur compounds can exert multiple biological and environmental effects including climate regulation. Climate change and other anthropogenic factors are predicted to affect coral-reef ecosystems where these sulfur compounds are particularly abundant. We review the processes that regulate the production of dimethylated sulfur compounds in coral reefs and the potential consequences of environmental changes on their biogenic cycle in such fragile ecosystems under future climate change scenarios. AbstractDimethylsulfoniopropionate (DMSP) and its main breakdown products dimethylsulfide (DMS) and dimethylsulfoxide (DMSO) are biogenic species in the marine environment. In coral reefs, these dimethylated sulfur compounds (DSCs) have been reported at greater concentrations than in other marine ecosystems, which is most likely attributable to the extraordinary large bio ersity of coral reef communities (e.g. corals, macroalgae, coralline algae, invertebrates) and to the unique ability of zooxanthellate corals to synthesise DMSP from both the animal host and algal symbionts. Besides the various biological functions that have been attributed to DSCs, including thermoregulation, osmoregulation, chemoattraction and antioxidant response, DMS is suspected to take part in a climate feedback loop that could help counteract global warming. Nowadays, anthropogenic effects such as pollution, overfishing, increased sedimentation and global climate change are imminently threatening the health of coral reef communities around the world, with possible consequences on the natural cycle of DSCs within these ecosystems. This review provides insight into the biogeochemistry of DSCs in coral reefs and discusses the implications of projected changes in DSC production in these increasingly stressed ecosystems under future climate change scenarios. It shows that DSC dynamics will incontestably be affected in the near future, with possible feedback consequences on local climate.
Publisher: Elsevier BV
Date: 10-2013
Publisher: Copernicus GmbH
Date: 19-11-2019
Abstract: Abstract. The biogenic sulfur compounds dimethyl sulfide (DMS), dimethyl sulfoniopropionate (DMSP) and dimethyl sulfoxide (DMSO) are produced and transformed by erse populations of marine microorganisms and have substantial physiological, ecological and biogeochemical importance spanning organism to global scales. Understanding the production and transformation dynamics of these compounds under shifting environmental conditions is important for predicting their roles in a changing ocean. Here, we report the physiological and biochemical response of a robust strain of Alexandrium minutum, a dinoflagellate with the highest reported intracellular DMSP content, exposed to a 6 d increase in temperature mimicking mild and extreme coastal marine heatwave conditions (+4 and +12 ∘C). Under mild temperature increases (+4 ∘C), A. minutum growth was enhanced, with no measurable physiological stress response. However, under a very acute increase in temperature (+12 ∘C) triggering thermal stress, A. minutum growth declined, photosynthetic efficiency (FV∕FM) was impaired, and enhanced oxidative stress was observed. These physiological responses indicative of thermal stress were accompanied by increased DMS and DMSO concentrations followed by decreased DMSP concentration. At this temperature extreme, we observed a cascading stress response in A. minutum, which was initiated 6 h after the start of the experiment by a spike in DMS and DMSO concentrations and a rapid decrease in FV∕FM. This was followed by an increase in reactive oxygen species (ROS) and an abrupt decline in DMS and DMSO on day 2 of the experiment. A subsequent decrease in DMSP coupled with a decline in the growth rate of both A. minutum and its associated total bacterial assemblage coincided with a shift in the composition of the A. minutum microbiome. Specifically, an increase in the relative abundance of the operational taxonomic units (OTUs) matching Oceanicaulis (17.0 %), Phycisphaeraceae SM1A02 (8.8 %) and Balneola (4.9 %) as well as a decreased relative abundance of Maribacter (24.4 %), Marinoscillum (4.7 %) and Seohaeicola (2.7 %) were primarily responsible for differences in microbiome structure observed between temperature treatments. These shifts in microbiome structure are likely to have been driven by either the temperature itself, the changing physiological state of A. minutum cells, shifts in biogenic sulfur concentrations, the presence of other solutes, or a combination of all. Nevertheless, we suggest that these results point to the significant effect of extreme heatwaves on the physiology, growth and microbiome composition of the red-tide causing dinoflagellate A. minutum, as well as potential implications for biogenic sulfur cycling processes and marine DMS emissions.
Publisher: Elsevier BV
Date: 10-2014
Publisher: American Geophysical Union (AGU)
Date: 22-06-2016
DOI: 10.1002/2016JD024966
Publisher: Wiley
Date: 07-04-2014
Publisher: American Geophysical Union (AGU)
Date: 06-04-2020
DOI: 10.1029/2019JD031837
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 08-2019
DOI: 10.1016/J.CHEMOSPHERE.2019.04.129
Abstract: A dimethyl sulfide (DMS) vertical concentration profile and DMS surface emission flux were quantified in undisturbed acid sulfate soils (ASS) at Cudgen Lake on the north coast of New South Wales, Australia. A deuterated internal standard was used to account for soil adsorption characteristics. The DMS vertical concentration profile increased exponentially from 0.6 m depth to the surface layer. This profile reflected the adsorption properties of the ASS horizons present and the experimentally determined octanol/water partition coefficient for DMS of 1.36, suggesting that DMS would be mobilised in the soil water medium for upward translocation in time due to surface evaporation. The organic material in the oxidised ASS crustal layer had a chemically strong adsorption affinity for DMS, which appeared to restrain its emission from surface soil particles to the atmosphere. The seasonally averaged DMS surface flux estimate from the Cudgen Lake ASS was 9 ng S m
Publisher: Copernicus GmbH
Date: 17-01-2017
Abstract: Abstract. Atmospheric dimethylsulfide (DMSa), continually derived from the world's oceans, is a feed gas for the tropospheric production of new sulfate particles, leading to cloud condensation nuclei that influence the formation and properties of marine clouds and ultimately the Earth's radiation budget. Previous studies on the Great Barrier Reef (GBR), Australia, have indicated coral reefs are significant sessile sources of DMSa capable of enhancing the tropospheric DMSa burden mainly derived from phytoplankton in the surface ocean however, specific environmental evidence of coral reef DMS emissions and their characteristics is lacking. By using on-site automated continuous analysis of DMSa and meteorological parameters at Heron Island in the southern GBR, we show that the coral reef was the source of occasional spikes of DMSa identified above the oceanic DMSa background signal. In most instances, these DMSa spikes were detected at low tide under low wind speeds, indicating they originated from the lagoonal platform reef surrounding the island, although evidence of longer-range transport of DMSa from a 70 km stretch of coral reefs in the southern GBR was also observed. The most intense DMSa spike occurred in the winter dry season at low tide when convective precipitation fell onto the aerially exposed platform reef. This co-occurrence of events appeared to biologically shock the coral resulting in a seasonally aberrant extreme DMSa spike concentration of 45.9 nmol m−3 (1122 ppt). Seasonal DMS emission fluxes for the 2012 wet season and 2013 dry season c aigns at Heron Island were 5.0 and 1.4 µmol m−2 day−1, respectively, of which the coral reef was estimated to contribute 4 % during the wet season and 14 % during the dry season to the dominant oceanic flux.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 02-2010
Publisher: Springer Science and Business Media LLC
Date: 20-05-2017
DOI: 10.1007/S00216-017-0385-8
Abstract: Dimethylsulfoniopropionate (DMSP) and eleven other target zwitterions were quantified in the branch tips of six Acropora species and Stylophora pistillata hard coral growing on the reef flat surrounding Heron Island in the southern Great Barrier Reef (GBR), Australia. Hydrophilic interaction liquid chromatography mass spectrometry (HILIC-MS) was used for s le analysis with isotope dilution MS applied to quantify DMSP. The concentration of DMSP was ten times greater in A. aspera than A. valida, with this difference being maintained throughout the spring, summer and winter seasons. In contrast, glycine betaine was present in significantly higher concentrations in these species during the summer than the winter. Exposure of branch tips of A. aspera to air and hypo-saline seawater for up to 1 h did not alter the concentrations of DMSP present in the coral when compared with control s les. DMSP was the most abundant target zwitterion in the six Acropora species examined, ranging from 44-78% of all target zwitterions in A. millepora and A. aspera, respectively. In contrast, DMSP only accounted for 7% in S. pistillata, with glycine betaine and stachydrine collectively accounting for 88% of all target zwitterions in this species. The abundance of DMSP in the six Acropora species examined points to Acropora coral being an important source for the biogeochemical cycling of sulfur throughout the GBR, since this reef-building branching coral dominates the coral cover of the GBR. Graphical Abstract HILIC-MS extracted ion chromatogram showing zwitterionic metabolites from the branching coral Acropora isopora.
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.MARPOLBUL.2017.10.070
Abstract: Dimethylsulfoniopropionate (DMSP) is a biogenic compound that could be involved in metal detoxification in both the host and endosymbionts of symbiotic corals. Acropora aspera, a common reef-building coral of the Great Barrier Reef, was exposed to zinc doses from 10 to 1000μg/L over 96h, with zinc being a low-toxic trace metal commonly used in the shipping industry. Over time, significantly lower DMSP concentrations relative to the control were found in both the host and symbionts in the highest zinc treatment where zinc uptake by both partners of the symbiosis was the highest. This clearly indicates that DMSP was consumed or stopped being produced under high and extended zinc exposure. This drop in DMSP was first observed in the host tissue, suggesting that the coral host was the first to respond to metal contamination. Such decrease in DMSP concentrations could influence the long-term health of corals under zinc exposure.
Publisher: Elsevier BV
Date: 09-2020
Publisher: American Geophysical Union (AGU)
Date: 03-2021
DOI: 10.1029/2020JC016783
Abstract: Biogenic emissions of dimethylsulfide (DMS) are an important source of sulfur to the atmosphere, with implications for aerosol formation and cloud albedo over the ocean. Natural aerosol sources constitute the largest uncertainty in estimates of aerosol radiative forcing and climate and thus, an improved understanding of DMS sources is needed. Coral reefs are strong point sources of DMS however, this coral source of biogenic sulfur is not explicitly included in climatologies or in model simulations. Consequently, the role of coral reefs in local and regional climate remains uncertain. We aim to improve the representation of tropical coral reefs in DMS databases by calculating a climatology of seawater DMS concentration (DMS w ) and sea‐air flux in the Great Barrier Reef (GBR), Australia. DMS w is calculated from remotely sensed observations of sea surface temperature and photosynthetically active radiation using a multiple linear regression model derived from field observations of DMS w in the GBR. We estimate that coral reefs and lagoon waters in the GBR (∼347,000 km 2 ) release 0.03–0.05 Tg yr −1 of DMS (0.02 Tg yr −1 of sulfur). Based on this estimate, global tropical coral reefs (∼600,000 km 2 ) could emit 0.08 Tg yr −1 of DMS (0.04 Tg yr −1 of sulfur), with the potential to influence the local radiative balance.
Publisher: Elsevier BV
Date: 02-2011
Publisher: Scientific Research Publishing, Inc.
Date: 2017
Publisher: Inter-Research Science Center
Date: 03-12-2014
DOI: 10.3354/MEPS11038
Publisher: Wiley
Date: 09-05-2020
DOI: 10.1002/LOM3.10363
Publisher: Elsevier BV
Date: 11-2014
Publisher: Scientific Research Publishing, Inc.
Date: 2017
Publisher: American Geophysical Union (AGU)
Date: 21-12-2018
DOI: 10.1029/2018JD029210
Publisher: Springer Science and Business Media LLC
Date: 22-01-2016
Publisher: American Geophysical Union (AGU)
Date: 09-2021
DOI: 10.1029/2021JG006418
Abstract: Isoprene is an important biogenic volatile organic compound with atmospheric emissions contributing to climate regulation. Because isoprene is predominantly sourced terrestrially, there is limited knowledge on the role it might play in marine systems. Here, we report for the first time isoprene concentrations and tidal fluxes from two subtropical mangrove creeks in Moreton Bay, Queensland, Australia: Jacob's Creek and Turkey Boat Creek in 2017 and 2019. Isoprene concentrations tracked the tide height with higher concentrations at high tide and lower concentrations at low tide in both creek systems, showing that isoprene was imported into the creeks on the flood tide. Mangrove creeks in Moreton Bay were a sink (−9.53 ± 9.10 nmol m −2 h −1 ) for isoprene. Isoprene was most likely produced in the open water by either phytoplankton or nearby seagrass beds and then consumed by bacterial communities as a carbon source within the mangrove creek sediments. Mangrove creeks in Moreton Bay are estimated to uptake isoprene at a rate of −6 mg m −2 y −1 , leading to a total global isoprene sink of −0.69 Gg C y −1 . While only a small component of the global marine atmospheric flux of 11,600 Gg C y −1 , isoprene constitutes an important functional link between marine ecosystems.
Start Date: 01-2021
End Date: 12-2023
Amount: $430,000.00
Funder: Australian Research Council
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