A5053672702- Coral and Marine Ecosystems Studies
- Marine and coastal plant biology
- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Coastal wetland ecosystem dynamics
- Ocean Acidification Effects and Responses
- Photosynthetic Processes and Mechanisms
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Marine and fisheries research
- Polar Research and Ecology
- Aquaculture disease management and microbiota
- Plant and animal studies
- Algal biology and biofuel production
- Cephalopods and Marine Biology
- Marine Invertebrate Physiology and Ecology
- Marine Sponges and Natural Products
- Marine Bivalve and Aquaculture Studies
- Coastal and Marine Management
- Perovskite Materials and Applications
- Insect symbiosis and bacterial influences
- Metabolomics and Mass Spectrometry Studies
- Leaf Properties and Growth Measurement
- Insect Pheromone Research and Control
- Calcium Carbonate Crystallization and Inhibition
Macquarie University
2016-2020
UNSW Sydney
2012-2018
Sydney Institute of Marine Science
2013-2018
University of Technology Sydney
2007-2016
Biochemical Society
1937
Abstract Macroalgal communities in Australia and around the world store vast quantities of carbon their living biomass, but prevalence growing on hard substrata means that they have limited capacity to act as long‐term sinks. Unlike other coastal blue habitats such seagrasses, saltmarshes mangroves, do not develop own organic‐rich sediments, may instead a rich source make significant contributions form detritus sedimentary by acting “carbon donor” “receiver sites” where organic material...
Understanding how multiple environmental stressors interact to affect seagrass health (measured as morphological and physiological responses) is important for responding global declines in populations. We investigated the interactive effects of temperature stress (24, 27, 30 32°C) shading (75, 50, 25 0% shade treatments) on Zostera muelleri over a 3-month period laboratory mesocosms. Z. widely distributed throughout temperate tropical waters south east coasts Australia, regarded regionally...
Corals rely on photosynthesis by their endosymbiotic dinoflagellates (Symbiodinium spp.) to form the basis of tropical coral reefs. High sea surface temperatures driven climate change can trigger loss Symbiodinium from corals (coral bleaching), leading declines in health. Different putative species (genetically distinct types) as well conspecific populations confer differing levels thermal tolerance host, but genes that govern dinoflagellate are unknown. Here we show physiological and...
The effects of elevated CO 2 and temperature on photosynthesis calcification in the calcifying algae Halimeda macroloba cylindracea symbiont‐bearing benthic foraminifera Marginopora vertebralis were investigated through exposure to a combination four temperatures (28°C, 30°C, 32°C, 34°C) levels (39, 61, 101, 203 Pa; pH 8.1, 7.9, 7.7, 7.4, respectively). Elevated caused profound decline photosynthetic efficiency (F V : F M ), calcification, growth all species. After five weeks at 34°C under...
We dissect the primary photo‐inactivation and counteracting metabolic repair rates in fragments of scleractinian coral, Pocillopora damicornis , subjected to a combined stress shift elevated temperature (from 26°C 32°C) increased light 200 µmol photons m −2 s −1 400 ) induce bleaching. During bleaching treatment dinoflagellate symbionts showed 5.5‐fold acceleration their photosystem II (PSII) rate constant, demonstrating that they maintain strong capacity clear replace photo‐damaged D1...
Diatoms are the primary source of nutrition and energy for Southern Ocean ecosystem. Microalgae, including diatoms, synthesise biological macromolecules such as lipids, proteins carbohydrates growth, reproduction acclimation to prevailing environmental conditions. Here we show that three key species diatom (Fragilariopsis cylindrus, Chaetoceros simplex Pseudo-nitzschia subcurvata) exhibited phenotypic plasticity in response salinity temperature regimes experienced during seasonal formation...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 361:139-150 (2008) - DOI: https://doi.org/10.3354/meps07360 Seasonal variation in photo-physiology of homogeneous and heterogeneous Symbiodinium consortia two scleractinian corals K. E. Ulstrup1,2,4,*, R. Hill1, M. J. H. van Oppen2, A. W. D. Larkum3, P. Ralph1 1Institute for Water & Environmental Resource...
Exposure to elevated temperature is known cause photosynthetic inhibition in the coral symbiont Symbiodinium sp. Through use of artificial electron acceptor, methyl viologen, this study identified how reduced capacity occurs as a result up‐ and/or downstream ferredoxin hospite and culture. Heterogeneity between species clades was thermal sensitivity photosynthesis symbionts scleractinian corals Stylophora pistillata Pocillopora damicornis , well among cultures A, B, C. The S. cultured clade...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 352:137-144 (2007) - DOI: https://doi.org/10.3354/meps07159 Post-bleaching viability of expelled zooxanthellae from scleractinian coral Pocillopora damicornis Ross Hill, Peter J. Ralph* Institute for Water and Environmental Resource Management Department Sciences, University Technology, Sydney, PO Box 123,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 286:125-132 (2005) - doi:10.3354/meps286125 Photosynthetic impact of hypoxia on in hospite zooxanthellae scleractinian coralPocillopora damicornis Karin E. Ulstrup, Ross Hill, Peter J. Ralph* Institute for Water and Environmental Resource Management, Department Sciences,University Technology, Sydney,...
Abstract Two inhibitors of the Calvin-Benson cycle (glycolaldehyde, GA, and potassium cyanide, KCN) were used in cultured Symbiodinium cells nubbins coral Pocillopora damicornis to test hypothesis that inhibition triggers bleaching. Inhibitor concentration range-finding trials aimed determine appropriate generate cycle, but avoid other metabolic impacts symbiont animal host. Both 3 mM GA 20 μM KCN caused minimal host respiration, did induce photosynthetic impairment, measured by a loss...
The effect of diel oscillations in light on the photosynthetic response three coral species during summer and winter was studied. Fast induction curves revealed detailed information primary photochemistry as well redox states electron acceptors photosystem II (PSII). comparison between seasons that similar physiological mechanisms were operating to high-light conditions throughout year environmental variables, such temperature, had no measurable seasons. A diurnal hysteresis seen both Fv /...