Aquat. Living Resour.
Volume 26, Number 3, July-September 2013
Thematic Section: Physiology in Marine Molluscs
|Page(s)||229 - 239|
|Published online||08 July 2013|
Trophic resources of the bivalve, Venus verrucosa, in the Chausey archipelago (Normandy, France) determined by stable isotopes and fatty acids
1 Institut des sciences de la mer,
Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec,
2 Muséum National d’Histoire Naturelle, DMPA, UMR 7208 BOREA CNRS-P6-MNHN-IRD, 61 rue Buffon, 75231 Paris, France
3 Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, LEMAR, UMR 6539, UBO-IRD-CNRS, Technopôle Brest-Iroise, rue Dumont d’Urville, 29280 Plouzané, France
a Corresponding author:
Accepted: 30 May 2013
In the Chausey archipelago, growth of the burrowing bivalve Venus verrucosa (Mollusca: Veneridae) has been shown to be highly variable between closely located sites (<1 km). To explain this small-scale spatial variability, we tested the trophic hypothesis using both fatty acid markers, and carbon and nitrogen stable isotopes (δ13C and δ15N). Environmental parameters, including substrate, were also analysed to discriminate their effects on potential trophic differences. Results of isotopic fractionation and lipid profiles of water column and digestive gland samples both showed a large contribution of phytoplankton to the diet of V. verrucosa. More surprisingly, the same results suggest that Phaeophyceae and Rhodophyceae macroalgae could contribute to the nutrition of V. verrucosa as dissolved exudates. Whereas site differences were not observed between the food sources of V. verrucosa, we showed that growth performance index was correlated to wave height. Thus, we hypothesized that the high local growth variability could be controlled by the hydrosedimentary dynamics. In addition, although no significant growth differences were found between intertidal and subtidal populations, better condition index and more total lipids were found in the digestive gland of intertidal V. verrucosa, suggesting potential compensatory growth mechanisms.
Key words: Shell growth / Benthic filter feeder / Food sources / Stable isotope / Lipid / Macrotidal flat / Atlantic Ocean
© EDP Sciences, IFREMER, IRD 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.