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Habitat Modeling Of Three Endemic Crayfish Species In The Black River Drainage Of Missouri And Arkansas: Factors Affecting Distribution And Abundance, Matthew Stephen Nolen Dec 2012

Habitat Modeling Of Three Endemic Crayfish Species In The Black River Drainage Of Missouri And Arkansas: Factors Affecting Distribution And Abundance, Matthew Stephen Nolen

Theses and Dissertations

The Ozark faunal region of Missouri and Arkansas harbors a high level of aquatic biological diversity, especially in regards to endemic crayfish. Orconectes eupunctus, Orconectes marchandi, and Cambarus hubbsi are three such endemics that are threatened by a limited natural distribution and the invasions of Orconectes neglectus. I sought to determine how natural and anthropogenic factors influence these three species across multiple spatial scales. Local and landscape data were used in decision tree analyses (CART) to determine their influence effect on presence/absence and density of the three species. Predictive models were validated using k-fold cross validation. O. eupunctus presence ...


The Status And Distribution Of Invasive Crayfishes And Their Effects On Native Crayfish Communities In West Virginia, Casey David Swecker Jan 2012

The Status And Distribution Of Invasive Crayfishes And Their Effects On Native Crayfish Communities In West Virginia, Casey David Swecker

Theses, Dissertations and Capstones

Introductions of non-native crayfish species have resulted in the global decline of native crayfish populations, including those in North America. The last large survey of crayfishes from West Virginia was in 1988 and 1989. In this thorough document Raymond Jezerinac, Whitney Stocker, and Donald Tarter identified three separate areas in West Virginia where non-native crayfish species have been introduced. One area is located in the Potomac River drainage in northeastern West Virginia commonly referred to as the eastern panhandle of the state. This is also the only drainage in West Virginia where the native spiny cheek crayfish (Orconectes limosus) occurs ...