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Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis

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Title: Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis
Authors: Aya, Frolan A. Browse this author
Kudo, Isao Browse this author →KAKEN DB
Keywords: Age
diet shift
isotope ecology
Issue Date: Mar-2017
Publisher: Taylor & Francis
Journal Title: Isotopes in environmental and health studies
Volume: 53
Issue: 1
Start Page: 80
End Page: 90
Publisher DOI: 10.1080/10256016.2016.1186024
PMID: 27225746
Abstract: Ontogenetic niche shifts in diet are a consequence of changes in body size or resource partitioning between age classes. To better resolve the feeding patterns of the Japanese scallop Mizuhopecten yessoensis, we examined the relative importance of age and size in the diet of this species using stable isotope ratios of carbon (C-13) and nitrogen (N-15) from 2006 to 2009. Contribution of food sources was quantified using an isotope mixing model by comparing the muscle tissue isotope ratios to those of suspended particulate organic matter (SPOM) and their zooplankton prey (e.g. micro- and meso-zooplankton). Unlike the C-13 values, which remained constant with age and size, muscle N-15 values were more positively correlated with age accounting for 69% of variations than size with only 46%. Increasing N-15 values with age suggested that shifts in diet from SPOM to micro- and meso-zooplankton occurred during ontogeny in M. yessoensis. Results of the isotope mixing model indicated that SPOM contribution to scallop's diet decreased from 68 to 8% while those of zooplankton increased from 15 to 50% with increasing age. This study concludes that age-related dietary shift explains the enrichment of N-15, as a result of predation on zooplankton by M. yessoensis.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Isotopes in Environmental and Health Studies on March 2017, available online:
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 勲

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