Date of Award

Spring 1982

Document Type

Thesis

Department

Life & Environmental Sciences

First Advisor

John Christenson

Second Advisor

Jean Smith

Third Advisor

Rev. Robert Butko

Abstract

The temperature selection and upper lethal temperature for two species of sculpin in the Flathead River Basin of northwestern Montana were investigated. Comparisons were made between Cottus cognatus and Cottus confusus concerning these thermal parameters to examine the possible relationship between altered thermal discharges below Hungry Horse Dam and reported hybridization between the two species. The data suggests that C. confusus has a higher preferred temperature and upper lethal temperature tolerance.

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