Comparative study of isotopic trends in two coastal ecosystems of North Biscay: A multitrophic spatial gradient approach
|Author(s)||Mortillaro J. M.2, 4, Schaal G.1, 2, Grall Jacques2, Nerot C.1, 4, Brind'Amour Anik3, Marchais V.1, Perdriau M.4, Le Bris H.4|
|Affiliation(s)||1 : Univ Bretagne Occidentale, IUEM, LEMAR, UMR CNRS IRD 6539, F-29280 Plouzane, France.
2 : IUEM, Observ Sci Univers, UMS 3113, F-29280 Plouzane, France.
3 : Ifremer Nantes, Unite EMH, F-44311 Nantes 03, France.
4 : Agrocampus Ouest, UMR Ecol & Sante Ecosyst 985, F-35042 Rennes, France.
|Source||Estuarine Coastal And Shelf Science (0272-7714) (Academic Press Ltd- Elsevier Science Ltd), 2014-01 , Vol. 136 , P. 149-156|
|WOS© Times Cited||5|
|Keyword(s)||Bay of Brest, Bay of Vilaine, benthic, filter-feeders, stable isotopes, organic matter|
|Abstract||In coastal estuarine embayments, retention of water masses due to coastal topography may result in an increased contribution of continental organic matter in food webs. However, in megatidal embayments, the effect of topography can be counterbalanced by the process of tidal mixing. Large amounts of continental organic matter are exported each year by rivers to the oceans. The fate of terrestrial organic matter in food webs of coastal areas and on neighboring coastal benthic communities was therefore evaluated, at multi-trophic levels, from primary producers to primary consumers and predators. Two coastal areas of the French Atlantic coast, differing in the contributions from their watershed, tidal range and aperture degree, were compared using carbon and nitrogen stable isotopes (δ13C and δ15N) during two contrasted periods. The Bay of Vilaine receives large inputs of freshwater from the Vilaine River, displaying 15N enriched and 13C depleted benthic communities, emphasizing the important role played by allochtonous inputs and anthropogenic impact on terrestrial organic matter in the food web. In contrast, the Bay of Brest which is largely affected by tidal mixing, showed a lack of agreement between isotopic gradients displayed by suspended particulate organic matter (SPOM) and suspension-feeders. Discrepancy between SPOM and suspension-feeders is not surprising due to differences in isotopes integration times. We suggest further that such a discrepancy may result from water replenishment due to coastal inputs, nutrient depletion by phytoplankton production, as well as efficient selection of highly nutritive phytoplanktonic particles by primary consumers.|