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14 results on '"Ferguson, Angus"'

8. Seagrass ecosystem trajectory depends on the relative timescales of resistance, recovery and disturbance

Author

O'Brien, Katherine R., primary, Waycott, Michelle, additional, Maxwell, Paul, additional, Kendrick, Gary A., additional, Udy, James W., additional, Ferguson, Angus J.P., additional, Kilminster, Kieryn, additional, Scanes, Peter, additional, McKenzie, Len J., additional, McMahon, Kathryn, additional, Adams, Matthew P., additional, Samper-Villarreal, Jimena, additional, Collier, Catherine, additional, Lyons, Mitchell, additional, Mumby, Peter J., additional, Radke, Lynda, additional, Christianen, Marjolijn J.A., additional, and Dennison, William C., additional

Published
2018
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14. Decomposition of jellyfish carrion in situ: Short-term impacts on infauna, benthic nutrient fluxes and sediment redox conditions

Author

Peter R. Teasdale, David T. Welsh, Ariella Chelsky, William W. Bennett, Kylie A. Pitt, Angus J. P. Ferguson, Chelsky, Ariella, Pitt, Kylie A, Ferguson, Angus JP, Bennett, William W, Teasdale, Peter R, and Welsh, David T

Subjects
0106 biological sciences, Geologic Sediments, Biogeochemical cycle, Jellyfish, Gelatinous zooplankton, Environmental Engineering, Scyphozoa, 010504 meteorology & atmospheric sciences, Biology, diffusive equilibration, 01 natural sciences, remineralization, Nutrient, biogeochemistry, biology.animal, gelatinous zooplankton, Animals, Environmental Chemistry, Carrion, Organic matter, sewage treatment, Waste Management and Disposal, 0105 earth and related environmental sciences, chemistry.chemical_classification, decomposition, benthic macrofauna, 010604 marine biology & hydrobiology, Water Pollution, Sediment, biology.organism_classification, Biota, Invertebrates, Pollution, Death, Oceanography, chemistry, Benthic zone, New South Wales, Oxidation-Reduction, Environmental Monitoring
Abstract

Jellyfish often form blooms that persist for weeks to months before they collapse en masse, resulting in the sudden release of large amounts of organic matter to the environment. This study investigated the biogeochemical and ecological effects of the decomposition of jellyfish in a shallow coastal lagoon in New South Wales, Australia. Catostylus mosaicus carrion was added to the surface of shallow sub-tidal sediments and biogeochemical parameters and macrofaunal abundance immediately below the jellyfish carrion were measured over three days. Sediment plots without jellyfish served as controls. Sediment oxygen demand and carbon and nitrogen efflux increased by up to 60-fold in the jellyfish plots, compared to control plots, and dissolved organic nutrient fluxes were more sustained than in previous studies due to the use of fresh rather than frozen biomass. The decomposing jellyfish progressively altered sediment redox conditions, indicated by an increase in porewater iron (II) and sulfide concentrations measured by high-resolution in situ diffusive samplers. Abundance of some macrofaunal taxa in the jellyfish plots decreased relative to controls, however, the abundance of a carnivorous gastropod, which was presumably feeding on the carrion, increased in the jellyfish plots. While jellyfish carrion may be a food source for some macrofauna, low oxygen conditions coupled with the accumulation of toxic dissolved sulfides in the near-surface sediments may explain the overall change in the macroinfaunal community. Refereed/Peer-reviewed

Published
2016

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