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- W2043369749 abstract "Many salmonids, including brook trout (Salvelinus fontinalis), contain both anadromous (migrant) and nonanadromous (resident) forms within a population (partial migration). Although partial migration is commonly observed, the mechanisms governing the adoption of migration or residency are poorly understood. We used field estimates of fish growth coupled with in situ estimates of food consumption rates to demonstrate that a trade-off exists between the ability to efficiently exploit local environments (resident approach) and the capacity to capitalize from large-scale environmental heterogeneity (migrant approach). We demonstrate that in the year before migration, migrant brook trout have consumption rates 1.4 times higher than those of resident brook trout. However, migrants have lower growth efficiencies (ratio of growth to consumption) than residents, indicating that migrants have higher metabolic costs. Residents and migrants also differed in their stable carbon isotope signatures (δ 13 C), a time-integrated measure that has been linked to habitat use. Fish muscle δ 13 C of migrants was depleted by 1 ± 0.1 compared with that of residents, and this could not be explained by any biases introduced by the time of sampling or the size of fish sampled. Our findings thus agree with the notion that a link exists between metabolic costs (efficiency) and the adopted life-history strategy." @default.
- W2043369749 created "2016-06-24" @default.
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- W2043369749 date "2003-04-01" @default.
- W2043369749 modified "2023-10-14" @default.
- W2043369749 title "Early juvenile bioenergetic differences between anadromous and resident brook trout (<i>Salvelinus fontinalis</i>)" @default.
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- W2043369749 doi "https://doi.org/10.1139/f03-036" @default.
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