Stable isotopes changes in the adductor muscle of diseased bivalve Ruditapes philippinarum |
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Authors: | Cécile Dang X de Montaudouin N Savoye N Caill-Milly P Martinez P G Sauriau |
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Institution: | (1) Université de Bordeaux, UMR 5805, Station Marine d’Arcachon, 2 rue du Pr Jolyet, 33120 Arcachon, France;(2) CNRS, UMR 5805, Station Marine d’Arcachon, 33120 Arcachon, France;(3) IFREMER, Laboratoire Ressources Halieutiques Aquitaine, 64600 Anglet, France;(4) Université de Bordeaux, UMR 5805, 33405 Talence, France;(5) CNRS, UMR 5805, 33405 Talence, France;(6) CNRS, LIENSs, Université de La Rochelle, 17000 La Rochelle, France |
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Abstract: | In this article, we show how a disease could bias stable isotope analyzes of trophic networks and propose a strategy in the
choice of tissues to be analyzed. In the past few years, a new pathology (brown muscle disease or BMD) affecting the posterior
adductor muscle of Ruditapes philippinarum has emerged in Arcachon Bay. BMD induces a necrosis of muscle tissues which become infused by conchiolin and hence calcified.
As muscle of mollusks are often used for trophic food webs studies through stable isotopic analyzes, this work investigated
the effect of BMD on carbon and nitrogen isotopic ratios of anterior and posterior adductor muscles of clams collected in
February and August 2007. Infected clams displayed a lower condition index and a posterior adductor muscle δ13C enrichment of 1.2‰ in February and 0.7‰ in August. δ15N of posterior muscles was however not affected by the disease. Anterior muscle of diseased clams remained healthy and displayed
the same isotopic signature as both posterior and anterior muscular tissues of healthy clam. Acidification significantly depleted
δ13C in posterior muscles of infected clams, suggesting calcification, contrary to anterior muscles of infected clam and to both
muscles of healthy clams, where no effect was observed. An X-ray diffractometry analysis confirmed the presence of CaCO3 (aragonite). Trophic food web studies relying on stable isotope ratios should utilize only healthy animals or anterior adductor
muscles when expertise in mollusk pathology is lacking. |
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