Graduate Project
 

Environmental correlates of freshwater fish species richness in Oregon

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https://ir.library.oregonstate.edu/concern/graduate_projects/tt44pn53v

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  • Native freshwater fish biodiversily is imperiled in Oregon with 36 species or sub-species listed by the State of Oregon as sensitive, threatened, or endangered, and 9 species or sub-species listed as endangered or threatened under the federal Endangered Species Act. Understanding and managing biodiversity is critical to its conservation. Using regression tree analysis and multiple linear regression, within the structure of an equal-area regular grid, the relationship of species richness to selected climatic, geographic, and historical characteristics, as well as anthropogenic stressors, were explored Results show that, in specific contexts, greater climatic stability, spatial heterogeneity, total stream length, human population, and non-native species richness, each can be associated with greater native species richness. Historical characteristics were not associated with richness in Oregon. Considering the known detrimental impacts of humans and non-natives on native species, the association of greater human population and greater non-native species with greater native richness calls for diligent action to prevent further deterioration of Oregon 's aquatic biodiversity.
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