{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/77625"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/77625","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Factors Affecting the Distribution and Abundance of Microtus Ochrogaster and M. Pennsylvanicus in East-Central Illinois (Competition, Agonistic)","abstract":"An apparent case of habitat segregation between the meadow vole (Microtus pennsylvanicus) and the prairie vole (M. ochrogaster) was investigated in east-central Illinois. Local distribution of the two species indicated a strong negative association. Multivariate analysis of variance of the vegetation characteristics of M. ochrogaster and M. pennsylvanicus sites were characterized by a greater total vegetation biomass, a higher percent composition of grasses other than Poa and by a lesser amount of Taraxacum than were M. ochrogaster sites. Discriminant function analysis indicated that the structure of the vegetation is a better predictor of whether a site is occupied by M. ochrogaster or M. pennsylvanicus, than are floristics. It is suggested that differential predation risk resulting from differences in nest location is responsible for the preference of M. pennsylvanicus for dense vegetation and tolerance of M. ochrogaster for sites with more sparse cover. A series of three manipulative field experiments using the addition or removal of individuals, to or from, open and enclosed vole populations were conducted between 1977 and 1984 to determine if the apparent habitat segregation was due to an interspecific competitive interaction. The experiments strongly suggested that: (1) a competitive interaction exists between M. pennsylvanicus and M. ochrogaster in central Illinois; (2) the two species do not compete directly for food; (3) the competitive interaction is a key determinant of the local distribution of the two species; and (4) some advantage in the competitive interaction accrues to the species which is first resident at a particular site. Interspecific dyadic encounters, conducted in each species' typical habitat, showed a strong habitat effect on the agonistic behavior of the two species. M. pennsylvanicus females tended to dominate both sexes of M. ochrogaster in dense vegetation, whereas male M. ochrogaster tended to dominate both sexes of M. pennsylvanicus in sparse vegetation. It is concluded that the between-habitat shift in agonistic behavior plays a key role in the competitive interaction, thus determining the distribution of these two species in east-central Illinois.","abstract_html":"An apparent case of habitat segregation between the meadow vole (Microtus pennsylvanicus) and the prairie vole (M. ochrogaster) was investigated in east-central Illinois. Local distribution of the two species indicated a strong negative association. Multivariate analysis of variance of the vegetation characteristics of M. ochrogaster and M. pennsylvanicus sites were characterized by a greater total vegetation biomass, a higher percent composition of grasses other than Poa and by a lesser amount of Taraxacum than were M. ochrogaster sites. Discriminant function analysis indicated that the structure of the vegetation is a better predictor of whether a site is occupied by M. ochrogaster or M. pennsylvanicus, than are floristics. It is suggested that differential predation risk resulting from differences in nest location is responsible for the preference of M. pennsylvanicus for dense vegetation and tolerance of M. ochrogaster for sites with more sparse cover. A series of three manipulative field experiments using the addition or removal of individuals, to or from, open and enclosed vole populations were conducted between 1977 and 1984 to determine if the apparent habitat segregation was due to an interspecific competitive interaction. The experiments strongly suggested that: (1) a competitive interaction exists between M. pennsylvanicus and M. ochrogaster in central Illinois; (2) the two species do not compete directly for food; (3) the competitive interaction is a key determinant of the local distribution of the two species; and (4) some advantage in the competitive interaction accrues to the species which is first resident at a particular site. Interspecific dyadic encounters, conducted in each species' typical habitat, showed a strong habitat effect on the agonistic behavior of the two species. M. pennsylvanicus females tended to dominate both sexes of M. ochrogaster in dense vegetation, whereas male M. ochrogaster tended to dominate both sexes of M. pennsylvanicus in sparse vegetation. It is concluded that the between-habitat shift in agonistic behavior plays a key role in the competitive interaction, thus determining the distribution of these two species in east-central Illinois.","abstract_has_math":false,"creators":["Klatt, Brian Jerome"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Ecology, Evolution, and Conservation Biology","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-14T15:18:01Z","date_published":"2015-05-14T15:18:01Z","updated_at":"2026-07-22T22:26:11Z","subjects":["Biology, Ecology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8701532"],"render_values":[{"text":"(UMI)AAI8701532","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/77625","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Klatt, Brian Jerome"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-05-14T15:18:01Z","10000-01-01","1986"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Ecology, Evolution, and Conservation Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology, Ecology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/77625","(UMI)AAI8701532"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["An apparent case of habitat segregation between the meadow vole (Microtus pennsylvanicus) and the prairie vole (M. ochrogaster) was investigated in east-central Illinois. Local distribution of the two species indicated a strong negative association. Multivariate analysis of variance of the vegetation characteristics of M. ochrogaster and M. pennsylvanicus sites were characterized by a greater total vegetation biomass, a higher percent composition of grasses other than Poa and by a lesser amount of Taraxacum than were M. ochrogaster sites. Discriminant function analysis indicated that the structure of the vegetation is a better predictor of whether a site is occupied by M. ochrogaster or M. pennsylvanicus, than are floristics. It is suggested that differential predation risk resulting from differences in nest location is responsible for the preference of M. pennsylvanicus for dense vegetation and tolerance of M. ochrogaster for sites with more sparse cover. A series of three manipulative field experiments using the addition or removal of individuals, to or from, open and enclosed vole populations were conducted between 1977 and 1984 to determine if the apparent habitat segregation was due to an interspecific competitive interaction. The experiments strongly suggested that: (1) a competitive interaction exists between M. pennsylvanicus and M. ochrogaster in central Illinois; (2) the two species do not compete directly for food; (3) the competitive interaction is a key determinant of the local distribution of the two species; and (4) some advantage in the competitive interaction accrues to the species which is first resident at a particular site. Interspecific dyadic encounters, conducted in each species' typical habitat, showed a strong habitat effect on the agonistic behavior of the two species. M. pennsylvanicus females tended to dominate both sexes of M. ochrogaster in dense vegetation, whereas male M. ochrogaster tended to dominate both sexes of M. pennsylvanicus in sparse vegetation. It is concluded that the between-habitat shift in agonistic behavior plays a key role in the competitive interaction, thus determining the distribution of these two species in east-central Illinois.","Made available in DSpace on 2015-05-14T15:18:01Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8701532.PDF: 3974700 bytes, checksum: 95446d8815c37dfd5c12f68c20ef1330 (MD5) Previous issue date: 1986","Embargo set by: Seth Robbins for item 78835 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","118 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986."]},{"key":"dc:title","label":"Title","values":["Factors Affecting the Distribution and Abundance of Microtus Ochrogaster and M. Pennsylvanicus in East-Central Illinois (Competition, Agonistic)"]}]}],"canonical_facts":{"dc:creator":["Klatt, Brian Jerome"],"dc:date":["2015-05-14T15:18:01Z","10000-01-01","1986"],"dc:description":["An apparent case of habitat segregation between the meadow vole (Microtus pennsylvanicus) and the prairie vole (M. ochrogaster) was investigated in east-central Illinois. Local distribution of the two species indicated a strong negative association. Multivariate analysis of variance of the vegetation characteristics of M. ochrogaster and M. pennsylvanicus sites were characterized by a greater total vegetation biomass, a higher percent composition of grasses other than Poa and by a lesser amount of Taraxacum than were M. ochrogaster sites. Discriminant function analysis indicated that the structure of the vegetation is a better predictor of whether a site is occupied by M. ochrogaster or M. pennsylvanicus, than are floristics. It is suggested that differential predation risk resulting from differences in nest location is responsible for the preference of M. pennsylvanicus for dense vegetation and tolerance of M. ochrogaster for sites with more sparse cover. A series of three manipulative field experiments using the addition or removal of individuals, to or from, open and enclosed vole populations were conducted between 1977 and 1984 to determine if the apparent habitat segregation was due to an interspecific competitive interaction. The experiments strongly suggested that: (1) a competitive interaction exists between M. pennsylvanicus and M. ochrogaster in central Illinois; (2) the two species do not compete directly for food; (3) the competitive interaction is a key determinant of the local distribution of the two species; and (4) some advantage in the competitive interaction accrues to the species which is first resident at a particular site. Interspecific dyadic encounters, conducted in each species' typical habitat, showed a strong habitat effect on the agonistic behavior of the two species. M. pennsylvanicus females tended to dominate both sexes of M. ochrogaster in dense vegetation, whereas male M. ochrogaster tended to dominate both sexes of M. pennsylvanicus in sparse vegetation. It is concluded that the between-habitat shift in agonistic behavior plays a key role in the competitive interaction, thus determining the distribution of these two species in east-central Illinois.","Made available in DSpace on 2015-05-14T15:18:01Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8701532.PDF: 3974700 bytes, checksum: 95446d8815c37dfd5c12f68c20ef1330 (MD5) Previous issue date: 1986","Embargo set by: Seth Robbins for item 78835 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","118 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986."],"dc:identifier":["http://hdl.handle.net/2142/77625","(UMI)AAI8701532"],"dc:language":["eng"],"dc:subject":["Biology, Ecology"],"dc:title":["Factors Affecting the Distribution and Abundance of Microtus Ochrogaster and M. Pennsylvanicus in East-Central Illinois (Competition, Agonistic)"],"dc:type":["text"],"thesis:degree_discipline":["Ecology, Evolution, and Conservation Biology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:11Z"}