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• W2892489472 abstract "Abstract Diets of stream‐dwelling salmonids vary at multiple spatial and temporal scales, but the relative importance of different sources of variation has rarely been evaluated for a population. In a small coastal basin in central California, we sampled diets of steelhead/Rainbow Trout Oncorhynchus mykiss monthly for a year from two reaches that differed in the presence of streambed travertine (calcium carbonate) to determine the relative magnitude of spatial, seasonal, and ontogenetic variation in consumption and diet composition. Seasonal parameters (cosine function terms for months in periodic regression and multivariate models) and fish size ( FL ) were greater sources of variation than differences between the two study reaches, and seasonal and ontogenetic patterns were evident despite high interindividual variability. Seasonal parameters explained the most variation in diet composition, which varied in an orderly pattern over the year. Consumption was highest in spring and summer for both aquatic and terrestrial prey, and seasonal parameters accounted for more variation than fish size for consumption of aquatic prey but this was reversed for terrestrial prey and total consumption. The main ontogenetic trend was increased consumption of terrestrial invertebrates: from 15‐20% of the energy consumed by 60–100‐mm fish to 60% of the energy consumed by fish larger than 160 mm. In addition, diet breadth (taxonomic richness and prey size) and the degree of variation among individuals also increased with fish size. Diet differences between sites were relatively small and included higher consumption of aquatic invertebrates at the site without travertine in 4 months and modest differences in the relative abundances of common prey taxa. Although seasonal and ontogenetic patterns were evident, interindividual variation was the dominant scale of diet variation, and diets of individual fish ranged from specialized to generalized relative to the population. Based on these findings, O. mykiss appeared to be opportunistic feeders that took advantage of diverse aquatic and terrestrial prey available in these study reaches." @default.
• W2892489472 created "2018-10-05" @default.
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• W2892489472 date "2018-11-26" @default.
• W2892489472 modified "2023-10-03" @default.
• W2892489472 title "Diet Variability of Steelhead/Rainbow Trout in a Coastal Basin in Central California: Relative Importance of Seasonal, Spatial, and Ontogenetic Variation" @default.
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• W2892489472 doi "https://doi.org/10.1002/tafs.10121" @default.
• W2892489472 hasPublicationYear "2018" @default.
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