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Title: Predicting cutthroat trout (Oncorhynchus clarkii) abundance in high-elevation streams: revisiting a model of translocation success

Author: Young, Michael K.; Guenther-Gloss, Paula M.; Ficke, Ashley D.

Date: 2005

Source: Canadian Journal of Fisheries and Aquatic Sciences, Volume 62, Number 10, 1 October 2005, pp. 2399-2408(10).

Publication Series: Miscellaneous Publication

Description: Assessing viability of stream populations of cutthroat trout (Oncorhynchus clarkii) and identifying streams suitable for establishing populations are priorities in the western United States, and a model was recently developed to predict translocation success (as defined by an index of population size) of two subspecies based on mean July water temperature, pool bankfull width, and deep pools counts. To determine whether the translocation model applied to streams elsewhere with more precise abundance estimates, we examined the relation between electrofishing-based estimates of cutthroat trout abundance and these habitat variables plus occupied stream length. The preferred model was (population size)1/2 = 0.00508(stream length (m)) + 5.148 (N = 31). In contrast, a model based on data from the original translocation model included stream temperature and deep pool counts as variables. Differences in models appear to largely have a methodological rather than biological basis. Additional habitat coupled with increased habitat complexity may account for the form of the abundance ­ stream length relation in the electrofishing-based model. Model-derived estimates imply that many cutthroat trout populations are below thresholds associated with reduced risk of extinction. We believe that this model can reduce uncertainty about projected population sizes when selecting streams for reintroductions or evaluating unsampled streams.

Keywords: cutthroat trout, Oncorhynchus clarkii, high-elevation streams, stream populations, translocation

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Young, Michael K.; Guenther-Gloss, Paula M.; Ficke, Ashley D. 2005. Predicting cutthroat trout (Oncorhynchus clarkii) abundance in high-elevation streams: revisiting a model of translocation success. Canadian Journal of Fisheries and Aquatic Sciences, Volume 62, Number 10, 1 October 2005, pp. 2399-2408(10).

 


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