Food resources of the bivalve Astarte elliptica in a sub-Arctic fjord: a multi-biomarker approach

Marine ecology progress series

, Frédéric Olivier¹  *, Tarik Meziane¹  , Martin E. Blicher²  , Søren Rysgaard³  , Réjean Tremblay⁴  Blandine Gaillard⁴  , Philippe Archambault⁵  , Laurent Chauvaud⁶ 

[1] Biologie des Organismes et Ecosystèmes Aquatiques, UMR-MNHN, CNRS, UPMC, IRD, UCN, UA, Muséum National d'Histoire Naturelle, 61 rue Buffon, CP 53, 75231 Paris Cedex 05, France;Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, Box 570, 3900 Nuuk, Greenland;Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, Box 570, 3900 Nuuk, Greenland. Centre for Earth Observation Science, CHR Faculty of Environment Earth and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, Manitoba R3T 2N2, Canada. Arctic Research Centre, Aarhus University, Ny Munkegade 114, Bldg. 1540, 8000 Aarhus C, Denmark;Institut des Sciences de la mer, Université du Québec à Rimouski, 310 Allée des Ursulines, Rimouski, Québec G5L 3A1, Canada;Institut des Sciences de la mer, Université du Québec à Rimouski, 310 Allée des Ursulines, Rimouski, Québec G5L 3A1, Canada. Québec-Océan, Département de Biologie, Université Laval, Québec G1V 0A6, Canada;Unité Mixte de Recherche ‘Laboratoire des sciences de l’environnement marin’ (LEMAR, UMR 6539), Institut Universitaire Européen de la Mer, Technopôle Brest-Iroise, rue Dumont d’Urville, 29280 Plouzané, France

关键词: Trophic ecology;    Stable isotopes;    Fatty acid trophic markers;    Compound-specific stable isotope analysis;    Sub-Arctic fjord;    Bivalve;   

DOI  :  10.3354/meps12036

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

It is generally agreed that pelagic-benthic coupling is tight on Arctic shelves, i.e. that organic matter produced in the surface layers supports the seafloor and benthos. However, this paradigm is mainly based on the assumption that phytoplankton and ice algae are the main sources of carbon for the benthic communities. Climate change is expected to alter the relative contribution of food sources for benthic organisms. Macroalgal biomass is predicted to increase in near-shore systems in response to increased temperature and reduced sea ice cover. Thus, a better understanding of the relative contribution of benthic and pelagic components in benthic food webs in the Arctic is needed. In this study, a multi-biomarker approach (stable isotopes, fatty acid trophic markers, and compound-specific stable isotope analysis) was applied to link potential sources of carbon, including particulate organic matter from subsurface and bottom waters, sediment organic matter, and 6 macroalgal species to the diet of the bivalve Astarte elliptica collected below the euphotic zone in a sub-Arctic fjord (Kobbefjord, Greenland). Results showed that A. elliptica feeds on particulate and sediment organic matter and that brown macroalgae significantly support the Arctic benthic food web. Multi-biomarker approaches can be used to determine the diet of benthic organisms and track temporal variability in sources of food. It therefore appears to be an interesting method to study food regime strategies in response to changing primary production dynamics.

【 授权许可】

Unknown