{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23114"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23114","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Biochemical investigations of the evolution and systematics of certain pocket mice (Rodentia: Heteromyidae)","abstract":"Several of the twenty or more species of pocket mice of the subfamily Perognathinae are questionable as to their systematic status and relationship to other species. In this study, three such species are examined. Perognathus amplus and P. longimembris are so similar in morphology and karyotype that at least one worker has proposed that they may be members of a single ring-species demonstrating circular overlap. On the basis of differences in morphology, karyotypes and allozymes between the subspecies of Chaetodipus penicillatus, others have suggested that this taxon may include cryptic species. The subspecies C. p. penicillatus and C. p. pricei were examined here.","abstract_html":"Several of the twenty or more species of pocket mice of the subfamily Perognathinae are questionable as to their systematic status and relationship to other species. In this study, three such species are examined. Perognathus amplus and P. longimembris are so similar in morphology and karyotype that at least one worker has proposed that they may be members of a single ring-species demonstrating circular overlap. On the basis of differences in morphology, karyotypes and allozymes between the subspecies of Chaetodipus penicillatus, others have suggested that this taxon may include cryptic species. The subspecies C. p. penicillatus and C. p. pricei were examined here.","abstract_has_math":false,"creators":["McKnight, Mark Leroy"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Lee, M. Raymond"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:02:41Z","date_published":"2011-05-07T14:02:41Z","updated_at":"2026-07-22T22:25:21Z","subjects":["Biology, Molecular","Biology, Genetics","Biology, Zoology"],"languages":["eng"],"rights":["Copyright 1989 McKnight, Mark Leroy"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010955","(UMI)AAI9010955"],"render_values":[{"text":"AAI9010955","href":null,"code":true},{"text":"(UMI)AAI9010955","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23114","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lee, M. 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In this study, three such species are examined. Perognathus amplus and P. longimembris are so similar in morphology and karyotype that at least one worker has proposed that they may be members of a single ring-species demonstrating circular overlap. On the basis of differences in morphology, karyotypes and allozymes between the subspecies of Chaetodipus penicillatus, others have suggested that this taxon may include cryptic species. The subspecies C. p. penicillatus and C. p. pricei were examined here.","By examination of mitochondrial DNA, allozymes, morphology, and karyotypes of these taxa, I am able to show that: (1) P. amplus and P. longimembris are distinct taxa (species), each of which contains several distinguishable taxonomic units (subspecies). (2) P. amplus and P. longimembris are not related paraphyletically, as the circular overlap hypothesis would predict, but are two separate monophyletic groups. (3) It is possible that these two species differentiated after becoming isolated by the Colorado River when it attained its modern course. (4) C. p. penicillatus and C. p. pricei often hybridize. The hybrids are capable of backcrossing to either of the parental taxa. Thus, these two taxa are not biological species.","Made available in DSpace on 2011-05-07T14:02:41Z (GMT). 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Raymond"],"dc:creator":["McKnight, Mark Leroy"],"dc:date":["2011-05-07T14:02:41Z","10000-01-01","1989"],"dc:description":["Several of the twenty or more species of pocket mice of the subfamily Perognathinae are questionable as to their systematic status and relationship to other species. In this study, three such species are examined. Perognathus amplus and P. longimembris are so similar in morphology and karyotype that at least one worker has proposed that they may be members of a single ring-species demonstrating circular overlap. On the basis of differences in morphology, karyotypes and allozymes between the subspecies of Chaetodipus penicillatus, others have suggested that this taxon may include cryptic species. The subspecies C. p. penicillatus and C. p. pricei were examined here.","By examination of mitochondrial DNA, allozymes, morphology, and karyotypes of these taxa, I am able to show that: (1) P. amplus and P. longimembris are distinct taxa (species), each of which contains several distinguishable taxonomic units (subspecies). (2) P. amplus and P. longimembris are not related paraphyletically, as the circular overlap hypothesis would predict, but are two separate monophyletic groups. (3) It is possible that these two species differentiated after becoming isolated by the Colorado River when it attained its modern course. (4) C. p. penicillatus and C. p. pricei often hybridize. The hybrids are capable of backcrossing to either of the parental taxa. Thus, these two taxa are not biological species.","Made available in DSpace on 2011-05-07T14:02:41Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9010955.pdf: 3837510 bytes, checksum: 09edce209104e9331a661f0cf7041bda (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:02:16Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:29:36-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9010955","(UMI)AAI9010955","http://hdl.handle.net/2142/23114"],"dc:language":["eng"],"dc:rights":["Copyright 1989 McKnight, Mark Leroy"],"dc:subject":["Biology, Molecular","Biology, Genetics","Biology, Zoology"],"dc:title":["Biochemical investigations of the evolution and systematics of certain pocket mice (Rodentia: Heteromyidae)"],"dc:type":["text"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:21Z"}