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• W3147756747 abstract "To clarify food resource use and niche breadths of the Japanese fluvial sculpin Cottus pollux (large-egg type), listed by over half the prefectures as an endangered species, we examined the diet and food selectivity of 168 specimens at 7 locations in 3 tributaries that drain into the upper regions of the Chikuma River. A stomach pump was used to assess the stomach contents. In total, 2,833 aquatic organisms from more than 22 families were found in the stomachs. An index of relative importance (IRI) indicated that chironomid, baetid, and ephemerellid larvae were the major prey for the sculpin. Despite considerable variation in the composition of aquatic organisms among locations, sculpin exhibited strong food selectivity for baetid, glossosomatid, chironomid, and tipulid larvae at multiple locations. Each individual sculpin preyed upon 17.2 prey items on average, and the number of prey items found in the stomach positively correlated with the number of prey families, regardless of sculpin body size. Of 22 prey fam- ilies found form all stomachs we examined, each individual sculpin preyed upon only 3.54 families on average. These findings suggest that sculpin may have relatively narrow niche breadths regardless of a considerable number of prey individuals in their stomachs. GLM results indicated that a model that incorporated water depth and sculpin body size was the most parsimonious model to explain the prey diversity index in the stomachs of the sculpins. The diversity index of aquatic organisms positively correlated with the mean water depth at each location. These data suggest that rivers with deeper water depths might allow colonization of a variety of aquatic organisms, which might be expected to enhance availability of prey potentially available for the sculpin." @default.
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• W3147756747 date "2012-01-01" @default.
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• W3147756747 title "Diet and food selectivity of Japanese fluvial sculpin Cottus pollux (large-egg type) in the upper regions of the Chikuma River" @default.
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