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dc.contributor.authorAya, Frolan A.
dc.contributor.authorKudo, Isao
dc.date.accessioned2019-09-16T02:29:28Z
dc.date.available2019-09-16T02:29:28Z
dc.date.issued2017
dc.identifier.citationAya, F. A., & Kudo, I. (2017). Nitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensis. Isotopes in Environmental and Health Studies, 53(1), 80-90.en
dc.identifier.issn1025-6016
dc.identifier.urihttp://hdl.handle.net/10862/3521
dc.description<a href="https://doi.org/10.6084/m9.figshare.3404635">View supplementary material</a>en
dc.description.abstractOntogenetic 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 (δ<sup>13</sup>C) and nitrogen (δ<sup>15</sup>N) 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 δ<sup>13</sup>C values, which remained constant with age and size, muscle δ<sup>15</sup>N values were more positively correlated with age accounting for 69 % of variations than size with only 46 %. Increasing <sup>15</sup>N values with age suggested that shifts in diet from SPOM to micro- and meso-zooplankton occurred during ontogeny in <i>M. yessoensis</i>. 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 <sup>15</sup>N, as a result of predation on zooplankton by M. yessoensis.en
dc.publisherTaylor & Francisen
dc.subjectMizuhopecten yessoensis
dc.subjecten
dc.subject動物en
dc.subjectCarbon-13en
dc.subjectDiet shiften
dc.subjectFooden
dc.subjectIsotope ecologyen
dc.subjectNitrogen-15en
dc.subjectホタテガイやイタヤガイの類en
dc.subject大きさen
dc.subject動物プランクトンen
dc.titleNitrogen stable isotopes reveal age-dependent dietary shift in the Japanese scallop Mizuhopecten yessoensisen
dc.typeArticleen
dc.citation.volume53
dc.citation.issue1
dc.citation.spage80
dc.citation.epage90
dc.citation.journalTitleIsotopes in Environmental and Health Studiesen
dc.identifier.essn1477-2639
dc.identifier.doi10.1080/10256016.2016.1186024


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