Master's Theses

Date of Award

Summer 1997

Degree Name

Master of Science (MS)




Nick Mandrak


It has been hypothesized that stream flow alteration within the Great Plains has resulted in a turnover in historic fish assemblage compositions. Cluster analysis and principal coordinates analysis were used to test for similarity between pre- and post-impoundment fish assemblage compositions within the Republican River drainage. Results indicate that areas that are in close proximity to impoundments have low similarities between pre- and post-impoundment fish assemblage compositions. Species composition has shifted from variable flow, broad, sandy stream fishes to fishes that are more suited for stable flow environments. Areas further away from impoundments show high similarities between pre- and post-impoundment assemblage compositions and I hypothesize that this similarity is related to persistence of historic stream flow cycles.


Copyright 1997 Terrence R. Malloy


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