A Stable Isotope Study on Seasonal Food Web Dynamics in a Eutrophic Lake

DOI Web Site Web Site 被引用文献29件

書誌事項

公開日
1994-04
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.2307/1941739
公開者
Wiley

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<jats:p>Phytoplankton, zooplankton, benthic invertebrates, and pond smelt were collected in a eutrophic lake (Lake Suwa, Japan) from spring to autumn in 1986 and 1987. Their stable carbon and nitrogen isotope ratios were analyzed together with conventional examination of the gut contents of pond smelt. Temporal variations in isotope rations were similar among the organisms other than benthic animals. The @d<jats:sup>1</jats:sup><jats:sup>5</jats:sup>N values of diet for several animals in the pelagic food web were estimated, assuming a stepwise enrichment in <jats:sup>1</jats:sup><jats:sup>5</jats:sup>N with increasing trophic level. A calanoid copepod, Eodiaptomus japonicus, seemed to feed on the predominant phytoplankton, including Microcystis spp., while Microcystis did not seem to be important as an organic source for other zooplankton and pond smelt. The temporal variation of the isotope ratios of pond smelt was well explained by visual gut content analysis. It is suggested that intensive measurements of carbon and nitrogen isotope ratios of each species serve to effectively assess the yearly dynamics of the food web structure in eutrophic lakes when productivity and species composition of plankton change seasonally.</jats:p>

収録刊行物

  • Ecology

    Ecology 75 (3), 835-846, 1994-04

    Wiley

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