Document Type

Thesis

Date of Degree Completion

1969

Degree Name

Master of Science (MS)

Department

Biology

Committee Chair

Stamford D. Smith

Second Committee Member

Curt A. Wiberg

Third Committee Member

Philip C. Dumas

Abstract

Three cold-blooded vertebrates, Dicamptodon ensatus, Cottus tenuis, and Salmo gairdneri were investigated as to food habits for a period of one year. The existence of competition between these animals for food was determined by means of stomach analysis. The results were compared relative to each vertebrate and the bottom fauna procurred from the stream. It was shown that the food habits of D. ensatus and S. gairdneri were diverse enough to warrant partial exclusion on the basis of food. C. tenuis demonstrated selectivity and was shown to be under competitive stress from the other two species.

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