Antarctic Legacy Archive

Exploring trophodynamics in the Southern Ocean: applications of fatty acid biomarkers and stable isotope ratios

Show simple item record Richoux, N.B. Froneman, P.W.
dc.coverage.spatial Southern Ocean 2021-03-10T09:25:40Z 2021-03-10T09:25:40Z 2007/10/09 2007/10/09
dc.description.abstract The dynamics of transfer of organic carbon among producers and consumers has interested trophic ecologists for several decades1. This field of research has proven to be particularly challenging for those investigating aquatic environments, as organisms of interest are often very small, remote and/or behaviourally complex. Furthermore, many species of plankton demonstrate a high degree of feeding plasticity, as the nature and availability of food can vary considerably both spatially and temporally. The diets of consumers are classically studied using gut contents and/or gut fluorescence analyses, approaches that are limited to freshly ingested prey, and in the latter case to herbivorous feeding2. Two methods that provide a time-integrated view of an organism's assimilated feeding history and incorporate both herbivorous and carnivorous pathways involve the determination of stable isotope ratios and fatty acid profiles3 4. Stable isotope ratios in animal tissues can be used as tracers to original sources of carbon at the base of a food chain as well as indicators of the trophic level of a population5, and fatty acids can provide information on the type and quality of resources assimilated by aquatic animals over ecologically meaningful time periods6,7. The aims of our current study are to determine trophodynamics among the numerically dominant zooplankton species and to assess regional differences in ecosystem fitness within the Subtropical Convergence zone (STC) using both stable isotope ratios and fatty acid profiles. As the STC can act as an effective biogeographical barrier8 food webs and the dynamics of energy transfer from primary producers to consumers on either side of this barrier are expected to differ. As global climate change has the potential to cause major shifts in the location, strength and physical and biological properties of the STC9 it is important to understand the potential effects on the biological communities inhabiting the region. Any changes in the food quality or availability for the dominant species or in the trophic relationships among producers and consumers may have serious implications for top consumers such as fish, birds and mammals. Successful characterization of food webs in the STC will provide an excellent framework for future studies in Southern Ocean trophic ecology. en_ZA
dc.description.sponsorship Sponsored by the the Department of Science and Innovation(DSI) through National Research Foundation (NRF) - South Africa en_ZA
dc.description.statementofresponsibility Antarctic Legacy of South Africa en_ZA
dc.format PDF en_ZA
dc.language English en_ZA
dc.publisher South African National Antarctic Programme (SANAP) en_ZA
dc.relation SANAP Symposium 2007 en_ZA
dc.relation.ispartof ARESSA THEME III: Biodiversity: Responses to Earth System Variability (Oral Presentations) en_ZA
dc.rights Copyright en_ZA
dc.rights Copyright en_ZA
dc.subject Research en_ZA
dc.subject Science en_ZA
dc.subject Meetings en_ZA
dc.subject Symposium en_ZA
dc.subject SANAP Symposium 2007 en_ZA
dc.subject Southern Ocean en_ZA
dc.subject Living Systems en_ZA
dc.subject Research en_ZA
dc.subject Marine Science en_ZA
dc.subject Ocean Science en_ZA
dc.subject Plankton en_ZA
dc.subject Stable Isotopes en_ZA
dc.subject Fatty Acid Profiles en_ZA
dc.subject Trophic Levels en_ZA
dc.title Exploring trophodynamics in the Southern Ocean: applications of fatty acid biomarkers and stable isotope ratios en_ZA
dc.type Abstracts en_ZA
dc.rights.holder Antarctic Legacy of South Africa en_ZA
dc.rights.holder Richoux, N.B. en_ZA
dc.rights.holder Froneman, P.W. en_ZA
iso19115.mdconstraints.uselimitation This item and the content of this website are subject to copyright protection. Reproduction of the content, or any part of it, other than for research, academic or non-commercial use is prohibited without prior consent from the copyright holder. en_ZA
iso19115.mddistributor.distributorcontact South African National Antarctic Programme (SANAP) en_ZA PDF en_ZA
iso19115.mdidentification.deliverypoint Antarctic Legacy of South Africa, Faculty of Science, Private Bag X1, Matieland. Stellenbosch. South Africa. en_ZA
iso19115.mdidentification.electronicmailaddress en_ZA
iso19115.mdidentification.organizationname Rhodes University en_ZA

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