Competition for Conifer Cones as a Potential Mechanism of Endangerment for the Mount Graham Red Squirrel

Persistent Link:
http://hdl.handle.net/10150/193441
Title:
Competition for Conifer Cones as a Potential Mechanism of Endangerment for the Mount Graham Red Squirrel
Author:
Minor, Rebecca
Issue Date:
2010
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Non-native species are a major cause of endangerment for native species, but the mechanisms are often unclear. As species invasions continue to rise, it is important to understand how to mitigate this threat. Our field experiment quantified the impact of introduced Abert's squirrels (Sciurus aberti) on rates of food removal within the range of the critically endangered Mount Graham red squirrel (Tamiasciurus hudsonicus grahamensis). In the presence of Abert's squirrels, the time until 50% of cones were removed was 5.55 days faster than when Abert's squirrels were excluded (95% confidence interval 2.25 to 11.63 days). The impact on food availability as a result of cone removal by Abert's squirrels suggests the potential of food competition as a mechanism of endangerment for the Mount Graham red squirrel. Eradication of established non-native populations is rare. Management targeted at specific mechanisms by which non-natives cause endangerment is an essential tool for conservation.
Type:
text; Electronic Thesis
Keywords:
Arizona; endangered species; invasive species; removal rate; resource competition; sciuridae
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Natural Resources; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Koprowski, John L.
Committee Chair:
Koprowski, John L.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleCompetition for Conifer Cones as a Potential Mechanism of Endangerment for the Mount Graham Red Squirrelen_US
dc.creatorMinor, Rebeccaen_US
dc.contributor.authorMinor, Rebeccaen_US
dc.date.issued2010en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractNon-native species are a major cause of endangerment for native species, but the mechanisms are often unclear. As species invasions continue to rise, it is important to understand how to mitigate this threat. Our field experiment quantified the impact of introduced Abert's squirrels (Sciurus aberti) on rates of food removal within the range of the critically endangered Mount Graham red squirrel (Tamiasciurus hudsonicus grahamensis). In the presence of Abert's squirrels, the time until 50% of cones were removed was 5.55 days faster than when Abert's squirrels were excluded (95% confidence interval 2.25 to 11.63 days). The impact on food availability as a result of cone removal by Abert's squirrels suggests the potential of food competition as a mechanism of endangerment for the Mount Graham red squirrel. Eradication of established non-native populations is rare. Management targeted at specific mechanisms by which non-natives cause endangerment is an essential tool for conservation.en_US
dc.typetexten_US
dc.typeElectronic Thesisen_US
dc.subjectArizonaen_US
dc.subjectendangered speciesen_US
dc.subjectinvasive speciesen_US
dc.subjectremoval rateen_US
dc.subjectresource competitionen_US
dc.subjectsciuridaeen_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineNatural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorKoprowski, John L.en_US
dc.contributor.chairKoprowski, John L.en_US
dc.contributor.committeememberConway, Courtneyen_US
dc.contributor.committeememberMannan, Williamen_US
dc.identifier.proquest11403en_US
dc.identifier.oclc752261269en_US
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