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Towards the trophic structure of the Bouvet Island marine ecosystem |
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| Authors: | U Jacob T Brey I Fetzer S Kaehler K Mintenbeck K Dunton K Beyer U Struck EA Pakhomov WE Arntz |
| Institution: | 1. Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, 27515, Bremerhaven, Germany 5. Centre for Environmental Research Leipzig-Halle, Permoserstra?e 15, 04318, Leipzig, Germany 2. Southern Ocean Group, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa 3. Marine Science Institute, University of Texas, 750 Channelview Drive Port, Austin, TX, 78373-5015, USA 4. GeoBio-Center at Ludwig-Maximilans-Universit?t, Richard-Wagner-Strasse 10, 80333, München, Germany 6. Zoology Department, Faculty of Science and Technology, University of Fort Hare, Private Bag X1314, Alice, 5700, South Africa 7. Department of Earth and Ocean Sciences, University of British Columbia, Stores Road, Stores Road, Vancouver, BC, V6T 1Z4, Canada |
| Abstract: | Although Bouvet Island is of considerable importance for Southern Ocean species conservation, information on the marine community species inventory and trophic functioning is scarce. Our combined study of stable isotopes and feeding relationships shows that (1) the marine system conforms to the trophic pattern described for other Antarctic systems within the Antarctic circumpolar current (ACC); (2) both the benthic and the pelagic subsystem are almost exclusively linked via suspended particulate organic matter (SPOM); and (3) there is no evidence of a subsystem driven by macroalgae. Bouvet Island can therefore be characterized as a benthic “oasis” within a self-sustaining open ocean pelagic system. |
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