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Isotopic shifts with size, culture habitat, and enrichment between the diet and tissues of the Japanese scallop Mizuhopecten yessoensis (Jay, 1857)
Aya, F.A.; Kudo, I. (2010). Isotopic shifts with size, culture habitat, and enrichment between the diet and tissues of the Japanese scallop Mizuhopecten yessoensis (Jay, 1857). Mar. Biol. (Berl.) 157(10): 2157-2167. http://dx.doi.org/10.1007/s00227-010-1480-y
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793
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| Abstract |
Use of stable isotope signatures to trace diet patterns in cultured marine bivalves, particularly when changing culture habitat, requires knowledge of the isotopic shift and enrichment between diet and consumer’s tissues. The aim of this study was to determine the patterns of isotope change and the variability of enrichment values (?d13C and ?d15N) in different tissues (muscle, gonad, digestive gland) of the Japanese scallop (Mizuhopecten yessoensis). It was hypothesized that the isotopic signatures of a consumer’s tissues changed during settlement and that the changes were related to variations in the isotopic signatures of food sources and gut contents. Particular attention was paid to the isotope enrichment between the diet and a consumer’s tissues using isotope analysis of gut content. Muscle d15N values decreased significantly 3–5 months post-settlement in a nearshore seabed, concomitant with the ingestion of lower d15N food. For juvenile scallops, sinking particles (SP) were considered a more important dietary source than suspended particulate organic matter (SPOM), based on the correspondence between SP and gut contents d13C. Enrichment values (?d13C and ?d15N) varied with tissue and season. ?d15N was 2.4‰ in muscle, 1.2‰ in gonad, and 0.7‰ in the digestive gland. ?d13C was 3.2‰ in muscle, 2.3‰ in gonad, and -0.5‰ in the digestive gland. ?d15N was the lowest in summer (0.3‰), and ?d13C was the highest in autumn (2.8‰). ?d15N values were significantly influenced by age, but not ?d13C. Patterns of isotope ratios and enrichment values may be related to physiological attributes and differences in diet. This is the first study to demonstrate isotopic shift and enrichment encountered in different tissues of a cultured scallop when changing culture habitat. |
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