A population viability analysis of the Oregon chub (Oregonichthys crameri) in the Willamette Valley, Oregon Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/p5547t28z

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  • The Oregon chub (Oregonichthys crameri) is a small minnow (Family: Cyprinidae) endemic to Oregon’s Willamette Valley. In 1993, the Oregon chub was listed as endangered because of habitat loss and predation and competition by nonnative fishes. Conservation efforts by the Oregon Department of Fish and Wildlife (ODFW) and other agencies have led the Oregon chub to become the first fish ever proposed for delisting due to recovery. The goal of this project was to analyze population parameters from 18 sites containing Oregon chub and determine how factors such as the presence of nonnative species and the supplementation of other chub might affect them. I used regression to determine overall trends for each population and a population viability analysis to evaluate quasi-extinction risk for each population. Results indicate that over long time periods, the supplementation of chub can reduce extinction risk, while the presence of nonnative fishes may cause populations to drop below critical thresholds for population size. The outcome of this project is important because it supports current management practices by showing that continued monitoring is needed to maintain the progress that has been made towards the recovery of the Oregon chub.
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