Investigation of an invasive crayfish and its relation to two imperiled native crayfishes; anthropogenic influences, multi-scale habitat associations, and conservation options

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Investigation of an invasive crayfish and its relation to two imperiled native crayfishes; anthropogenic influences, multi-scale habitat associations, and conservation options

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dc.contributor.advisor Rabeni, Charles F. en_US
dc.contributor.author Westhoff, Jacob Thomas
dc.date.accessioned 2012-05-18T18:48:50Z
dc.date.available 2012-05-18T18:48:50Z
dc.date.issued 2011
dc.date.submitted 2011 Summer en_US
dc.identifier.other WesthoffJ-062811-D578
dc.identifier.uri http://hdl.handle.net/10355/14242
dc.description "July 2011" en_US
dc.description Title from PDF of title page (University of Missouri--Columbia, viewed on May 18, 2012). en_US
dc.description The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. en_US
dc.description Dissertation advisor: Dr. Charles F. Rabeni en_US
dc.description Vita. en_US
dc.description Includes bibliographical references. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Fisheries and wildlife. en_US
dc.description.abstract The introduced Woodland Crayfish (Orconectes hylas) is spreading throughout the St. Francis River, Missouri. The imperiled Big Creek Crayfish (Orconectes peruncus) and St. Francis River Crayfish (Orconectes quadruncus) are often extirpated from locations where O. hylas establishes. The goal of my study was to find evidence that explains how O. hylas displaces either of these natives and provide managers with potential conservation actions to ensure their persistence. Investigation of associations among natural and anthropogenic factors at a coarse-spatial scale with the distributions of O. hylas, O. peruncus, and O. quadruncus was done using classification trees. Orconectes hylas was not positively associated with anthropogenic alterations, suggesting that it is not taking advantage of stressed aquatic environments to establish and replace native crayfishes. The most highly associated natural factors for all three species related to either soils or geology. Fine-scale habitat use of O. hylas and O. quadruncus was assessed by tracking uniquely tagged adult crayfish and measuring habitat characteristics. Both species used a wide range of habitat conditions, but slow water and coarse substrate particles were the most highly selected attributes. Orconectes quadruncus selected the slowest water, but there were no other significant differences in the habitat selection between species. A monitoring framework was developed based on occupancy estimation to determine the status of O. peruncus, O. quadruncus, and O. hylas. The results of my study were discussed in a theoretical and applied format that considers both specific conservation actions to address the study species and also crayfish conservation in general. en_US
dc.format.extent xvi, 254 pages en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.relation.ispartof 2011 Freely available dissertations (MU) en_US
dc.subject introduced species en_US
dc.subject species displacement en_US
dc.subject crayfish en_US
dc.subject habitat monitoring en_US
dc.title Investigation of an invasive crayfish and its relation to two imperiled native crayfishes; anthropogenic influences, multi-scale habitat associations, and conservation options en_US
dc.type Thesis en_US
thesis.degree.discipline Fisheries and wildlife sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name Ph. D. en_US
thesis.degree.level Doctoral en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Dissertations. 2011 Dissertations


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