{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/89023"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/89023","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Comparative reproductive biology of co-occurring endangered and common shrubland birds","abstract":"Black-capped vireos (Vireo atricapilla) and white-eyed vireos (Vireo griseus) are closely related and ecologically similar. Despite these similarities, white-eyed vireos are widely distributed and common, whereas the black-capped vireo has a restricted breeding range and is federally endangered. Here I address this apparent paradox with a comparative ecological study of co-occurring black-capped and white-eyed vireos. I studied vireos in shrublands and woodlands in central Texas, USA in 2013 and 2014. I used point count surveys (n = 256) and nest monitoring (n = 145) to determine arrival dates, settlement patterns, nest site selection, and, ultimately, nest survival relative to temporal and habitat factors. Additionally, I conducted reciprocal playback trials (n = 16) to test for the presence of interspecific aggression. White-eyed vireos arrived first and established territories in shrub and woodland habitat with equal probability. Black-capped vireos arrive after white-eyed vireos and settled in greater numbers in shrubland habitat. White-eyed vireos begin initiating nests earlier than black-capped vireos and selected nest sites surrounded by taller, more mature, and more densely wooded vegetation. Playback trials failed to detect evidence of interspecific aggression, suggesting that competition with white-eyed vireos is not currently limiting black-capped vireos. For both species, nest survival declined as the season progressed, and was greater for nests in taller, more mature habitat. Accordingly, overall nest survival appeared greater for white-eyed vireos than black-capped vireos suggesting that the flexibility demonstrated by white-eyed vireos in where and when they nest confers a reproductive advantage.","abstract_html":"Black-capped vireos (Vireo atricapilla) and white-eyed vireos (Vireo griseus) are closely related and ecologically similar. Despite these similarities, white-eyed vireos are widely distributed and common, whereas the black-capped vireo has a restricted breeding range and is federally endangered. Here I address this apparent paradox with a comparative ecological study of co-occurring black-capped and white-eyed vireos. I studied vireos in shrublands and woodlands in central Texas, USA in 2013 and 2014. I used point count surveys (n = 256) and nest monitoring (n = 145) to determine arrival dates, settlement patterns, nest site selection, and, ultimately, nest survival relative to temporal and habitat factors. Additionally, I conducted reciprocal playback trials (n = 16) to test for the presence of interspecific aggression. White-eyed vireos arrived first and established territories in shrub and woodland habitat with equal probability. Black-capped vireos arrive after white-eyed vireos and settled in greater numbers in shrubland habitat. White-eyed vireos begin initiating nests earlier than black-capped vireos and selected nest sites surrounded by taller, more mature, and more densely wooded vegetation. Playback trials failed to detect evidence of interspecific aggression, suggesting that competition with white-eyed vireos is not currently limiting black-capped vireos. For both species, nest survival declined as the season progressed, and was greater for nests in taller, more mature habitat. Accordingly, overall nest survival appeared greater for white-eyed vireos than black-capped vireos suggesting that the flexibility demonstrated by white-eyed vireos in where and when they nest confers a reproductive advantage.","abstract_has_math":false,"creators":["Kovar, Daniel George"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Natural Resources & Environmental Sciences","degree_department":null,"school":null,"contributors":["Sperry, Jinelle H"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-03-02T19:34:03Z","date_published":"2016-03-02T19:34:03Z","updated_at":"2026-07-22T22:26:32Z","subjects":["comparative ecology","habitat selection","interspecific competition","endangered species management and conservation","avian ecology","nest site selection","nest survival","brood parasitism","black-capped vireo","Vireo atricapilla","white-eyed vireo","Vireo griseus"],"languages":["en"],"rights":["Copyright 2015 Daniel George Kovar"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/89023","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sperry, Jinelle H"]},{"key":"dc:creator","label":"Author","values":["Kovar, Daniel George"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016-03-02T19:34:03Z","2015-11-30","2015-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Resources & Environmental Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["comparative ecology","habitat selection","interspecific competition","endangered species management and conservation","avian ecology","nest site selection","nest survival","brood parasitism","black-capped vireo","Vireo atricapilla","white-eyed vireo","Vireo griseus"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Daniel George Kovar"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/89023"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Black-capped vireos (Vireo atricapilla) and white-eyed vireos (Vireo griseus) are closely related and ecologically similar. Despite these similarities, white-eyed vireos are widely distributed and common, whereas the black-capped vireo has a restricted breeding range and is federally endangered. Here I address this apparent paradox with a comparative ecological study of co-occurring black-capped and white-eyed vireos. I studied vireos in shrublands and woodlands in central Texas, USA in 2013 and 2014. I used point count surveys (n = 256) and nest monitoring (n = 145) to determine arrival dates, settlement patterns, nest site selection, and, ultimately, nest survival relative to temporal and habitat factors. Additionally, I conducted reciprocal playback trials (n = 16) to test for the presence of interspecific aggression. White-eyed vireos arrived first and established territories in shrub and woodland habitat with equal probability. Black-capped vireos arrive after white-eyed vireos and settled in greater numbers in shrubland habitat. White-eyed vireos begin initiating nests earlier than black-capped vireos and selected nest sites surrounded by taller, more mature, and more densely wooded vegetation. Playback trials failed to detect evidence of interspecific aggression, suggesting that competition with white-eyed vireos is not currently limiting black-capped vireos. For both species, nest survival declined as the season progressed, and was greater for nests in taller, more mature habitat. Accordingly, overall nest survival appeared greater for white-eyed vireos than black-capped vireos suggesting that the flexibility demonstrated by white-eyed vireos in where and when they nest confers a reproductive advantage.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Daniel Kovar, accepted the attached license on 2015-11-30 at 10:27.","The student, Daniel Kovar, submitted this Thesis for approval on 2015-11-30 at 13:50.","This Thesis was approved for publication on 2015-11-30 at 14:47.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8867 on 2016-03-02 at 12:50:45","Made available in DSpace on 2016-03-02T19:34:03Z (GMT). No. of bitstreams: 3 KOVAR-THESIS-2015.pdf: 817098 bytes, checksum: 73b76fce16c14c89611f1175c56379d9 (MD5) DKovar_MS Thesis_v5.docx: 189731 bytes, checksum: bdd9b56d69a80bfcbccd7ceee2f3aad3 (MD5) LICENSE.txt: 4209 bytes, checksum: ce9b46176c60ee2719992dc83741c10e (MD5) Previous issue date: 2015-11-30"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Comparative reproductive biology of co-occurring endangered and common shrubland birds"]}]}],"canonical_facts":{"dc:contributor":["Sperry, Jinelle H"],"dc:creator":["Kovar, Daniel George"],"dc:date":["2016-03-02T19:34:03Z","2015-11-30","2015-12"],"dc:description":["Black-capped vireos (Vireo atricapilla) and white-eyed vireos (Vireo griseus) are closely related and ecologically similar. Despite these similarities, white-eyed vireos are widely distributed and common, whereas the black-capped vireo has a restricted breeding range and is federally endangered. Here I address this apparent paradox with a comparative ecological study of co-occurring black-capped and white-eyed vireos. I studied vireos in shrublands and woodlands in central Texas, USA in 2013 and 2014. I used point count surveys (n = 256) and nest monitoring (n = 145) to determine arrival dates, settlement patterns, nest site selection, and, ultimately, nest survival relative to temporal and habitat factors. Additionally, I conducted reciprocal playback trials (n = 16) to test for the presence of interspecific aggression. White-eyed vireos arrived first and established territories in shrub and woodland habitat with equal probability. Black-capped vireos arrive after white-eyed vireos and settled in greater numbers in shrubland habitat. White-eyed vireos begin initiating nests earlier than black-capped vireos and selected nest sites surrounded by taller, more mature, and more densely wooded vegetation. Playback trials failed to detect evidence of interspecific aggression, suggesting that competition with white-eyed vireos is not currently limiting black-capped vireos. For both species, nest survival declined as the season progressed, and was greater for nests in taller, more mature habitat. Accordingly, overall nest survival appeared greater for white-eyed vireos than black-capped vireos suggesting that the flexibility demonstrated by white-eyed vireos in where and when they nest confers a reproductive advantage.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms","The student, Daniel Kovar, accepted the attached license on 2015-11-30 at 10:27.","The student, Daniel Kovar, submitted this Thesis for approval on 2015-11-30 at 13:50.","This Thesis was approved for publication on 2015-11-30 at 14:47.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8867 on 2016-03-02 at 12:50:45","Made available in DSpace on 2016-03-02T19:34:03Z (GMT). No. of bitstreams: 3 KOVAR-THESIS-2015.pdf: 817098 bytes, checksum: 73b76fce16c14c89611f1175c56379d9 (MD5) DKovar_MS Thesis_v5.docx: 189731 bytes, checksum: bdd9b56d69a80bfcbccd7ceee2f3aad3 (MD5) LICENSE.txt: 4209 bytes, checksum: ce9b46176c60ee2719992dc83741c10e (MD5) Previous issue date: 2015-11-30"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/89023"],"dc:language":["en"],"dc:rights":["Copyright 2015 Daniel George Kovar"],"dc:subject":["comparative ecology","habitat selection","interspecific competition","endangered species management and conservation","avian ecology","nest site selection","nest survival","brood parasitism","black-capped vireo","Vireo atricapilla","white-eyed vireo","Vireo griseus"],"dc:title":["Comparative reproductive biology of co-occurring endangered and common shrubland birds"],"dc:type":["text"],"thesis:degree_discipline":["Natural Resources & Environmental Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:32Z"}