Trophic resources of the bivalve,Venus verrucosa, in the Chausey archipelago (Normandy, France) determined by stable isotopes and fatty acids

摘要: In the Chausey archipelago, growth of burrowing bivalve Venus verrucosa (Mollusca: Veneridae) has been shown to be highly variable between closely located sites ( 13 C and δ 15 N). Environmental parameters, including substrate, were also analysed discriminate their effects on potential trophic differences. Results isotopic fractionation lipid profiles water column digestive gland samples both showed a large contribution phytoplankton diet V. . More surprisingly, same results suggest that Phaeophyceae Rhodophyceae macroalgae could contribute nutrition as dissolved exudates. Whereas site differences not observed food sources , we performance index was correlated wave height. Thus, hypothesized high local variability controlled by hydrosedimentary dynamics. addition, although no significant found intertidal subtidal populations, better condition more total lipids in suggesting compensatory mechanisms.