Characteristics of pools used by adult summer steelhead (Oncorhynchus mykiss) in the Steamboat Creek Basin, North Umpqua River, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bc386m785

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  • This study examined features of deep pool (>0.8 m mean depth) used by adult summer steelhead in Steamboat Creek (1991-1992). Steamboat Creek had a heterogenous thermal profile, with some segments exceeding preferred temperature of steelhead. Deep pools were scarce (4% of the total habitat units) and 39% of them were identified as cool pools (mean bottom water temperature [less than or equal to] 19°C). Adult summer steelhead were found primarily in deep pools, avoiding other habitats (glides, riffles) and even cold but shallow tributary junctions. Use of odds ratio showed that use of cool pools use was estimated to be 11 times greater than the odds of the use of warm pools (P <0.001). Discriminant analysis identified mean bottom pool water temperature, riparian forest at the pool bank, proportion of large boulders, maximum length and mean depth as the best subset of variables that accounted for differences between pools occupied and not occupied by adult steelhead. A total of 69% of the variation was explained by differences in used and not used groups. Classification accuracy was 89%. Canton Creek, a tributary of Steamboat Creek, were tested as validation site for the derived model, observing that the classification function performed moderately, achieving a hit-ratio of 0.7. Results of the study showed that, since bottom pool temperature was a major factor but other ecological factors were also relevant, an integrated framework would be required in determining pool used by this species. Moderate success of the predictive model suggests that managers will want to check it before applying in other basins.
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