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- W3019771261 abstract "Abstract Volitional dispersal is a ubiquitous strategy characteristic of species across major faunal groups. Dispersal during the juvenile life stage is of interest because early performance can be critical for determining future success (survival/reproduction). For salmonids, dispersal can influence local density, competition, individual growth and survival, though drivers of dispersal at meso‐scales are rarely quantified. Here, we evaluate dispersal of tagged juvenile steelhead ( Oncorhynchus mykiss ) through habitat units in extended stream reaches (500 m) at sites across a watershed from July to October 2017. Our aim was to quantify the frequency and spatial extent of dispersal, identify links to biotic and abiotic factors, evaluate the implications for individual growth and test for associations between dispersal and migration initiation. Dispersal rates varied between sites, but were consistently higher for age 1+ than for age 0 steelhead (avg. 21% vs. 6% respectively). Age 1+ dispersal probability was positively correlated with time between recapture events and body mass, and negatively correlated with growth rate, maximum temperature experienced and age 1+ density. At sites where there appeared to be growth benefits to remaining sedentary compared to moving, proportionally fewer fish performed dispersal. We found no links between dispersal and timing or probability of migration initiation the following spring. Our results support the hypothesis that although dispersal over intermediate scales (10–1,000 m) might be rare, it could be an important strategy that permits fish to seek out better opportunities (foraging, shelter or otherwise) in underutilised areas." @default.
- W3019771261 created "2020-05-01" @default.
- W3019771261 creator A5026775031 @default.
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- W3019771261 date "2020-04-22" @default.
- W3019771261 modified "2023-10-17" @default.
- W3019771261 title "Variation in juvenile steelhead (<i>Oncorhynchus mykiss</i>) dispersal in relation to age and growth performance" @default.
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- W3019771261 doi "https://doi.org/10.1111/eff.12548" @default.
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