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• W1504257646 abstract "Self-thinning patterns are frequently used to describe density dependence in populations on timescales shorter than the organism's life span and have been used to infer carrying capacity of the environment. Among mobile animals, this concept has been used to document density dependence in stream salmonids, which compete over access to food and space. The carrying capacity, growth conditions, and initial cohort sizes often vary between streams and stream sections, which would influence the onset and strength of the density dependence. Despite much effort in describing habitat relationships in stream fishes, few studies have explicitly tested how the physical environment affects the slope of the thinning curves. Here, we investigate the prevalence and strength of self-thinning in juvenile stages of a steelhead (Oncorhynchus mykiss) population in Idaho, USA. Further, we investigate the roles of local physical habitat and metabolic constraints in explaining the variation in thinning curves among study sites in the watershed. Only yearling steelhead exhibited an overall significant thinning trend, but the slope of the mass–density relationship (−0.53) was shallower than predicted by theory and reported from empirical studies. There was no detectable relationship in subyearling steelhead. Certain abiotic factors explained a relatively large portion of the variation in the strength of the self-thinning among the study reaches. For subyearling steelhead, the slopes were negatively associated with the average water depth and flow velocity in the study sites, whereas slopes in yearlings were steeper in sites that incurred a higher metabolic cost. Our results show that the prevalence and strength of density dependence in natural fish populations can vary across heterogeneous watersheds and can be more pronounced during certain stages of a species' life history, and that environmental factors can mediate the extent to which density dependence is manifested in predictable ways." @default.
• W1504257646 created "2016-06-24" @default.
• W1504257646 creator A5032186178 @default.
• W1504257646 creator A5036028850 @default.
• W1504257646 date "2015-07-15" @default.
• W1504257646 modified "2023-09-25" @default.
• W1504257646 title "Local habitat conditions explain the variation in the strength of self‐thinning in a stream salmonid" @default.
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• W1504257646 doi "https://doi.org/10.1002/ece3.1591" @default.
• W1504257646 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4569021" @default.
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• W1504257646 hasPublicationYear "2015" @default.
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