{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/113075"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/113075","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Migration phenology and fertility of imperiled Illinois salamander (Ambystoma) species","abstract":"Made available in DSpace on 2022-01-12T21:46:56Z (GMT). No. of bitstreams: 2 CALLAHAN-THESIS-2021.pdf: 2826996 bytes, checksum: 5cc241706b5a8e00e8dc8731cde47fc3 (MD5) LICENSE.txt: 4210 bytes, checksum: 284778725358f3904105b35f49d32554 (MD5) Previous issue date: 2021-07-21","abstract_html":"Made available in DSpace on 2022-01-12T21:46:56Z (GMT). No. of bitstreams: 2 CALLAHAN-THESIS-2021.pdf: 2826996 bytes, checksum: 5cc241706b5a8e00e8dc8731cde47fc3 (MD5) LICENSE.txt: 4210 bytes, checksum: 284778725358f3904105b35f49d32554 (MD5) Previous issue date: 2021-07-21","abstract_has_math":false,"creators":["Callahan, Shay Anna"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Natural Res & Env Sciences","degree_department":null,"school":null,"contributors":["Dreslik, Michael J","Crawford, John A"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-01-12T21:46:56Z","date_published":"2022-01-12T21:46:56Z","updated_at":"2026-07-22T22:24:53Z","subjects":["Phenology","Migration","Ambystoma","Mole salamander","Fertility","Mark and Recapture"],"languages":["en"],"rights":["Copyright 2021 Shay Callahan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/113075","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dreslik, Michael J","Crawford, John A"]},{"key":"dc:creator","label":"Author","values":["Callahan, Shay Anna"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-01-12T21:46:56Z","2021-07-21","2021-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Res & Env 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":["Phenology","Migration","Ambystoma","Mole salamander","Fertility","Mark and Recapture"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2021 Shay Callahan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/113075"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Made available in DSpace on 2022-01-12T21:46:56Z (GMT). No. of bitstreams: 2 CALLAHAN-THESIS-2021.pdf: 2826996 bytes, checksum: 5cc241706b5a8e00e8dc8731cde47fc3 (MD5) LICENSE.txt: 4210 bytes, checksum: 284778725358f3904105b35f49d32554 (MD5) Previous issue date: 2021-07-21","Habitat loss is the primary driver of global amphibian declines. Habitat restoration and management of aquatic and terrestrial habitats are underway in Illinois, where over 90% of wetlands have been lost. Demographic and phenologic data are needed to inform land management decisions, such as the timing of controlled burns, to help avoid causing harm to amphibians moving between aquatic and terrestrial habitats (and vice versa). Interfering, stressing, or causing mortality of migrating adults could result in cascading effects on reproduction and recruitment. The Jefferson Salamander (Ambystoma jeffersonianum), Silvery Salamander (A. platineum), and Blue-spotted Salamander (A. laterale) are three species of conservation concern in Illinois that migrate annually from upland habitat to wetlands for reproduction. Juveniles (metamorphs) subsequently emigrate from wetlands to terrestrial habitats after metamorphosis. I conducted a census for each species over three years to understand the environmental factors influencing adult and juvenile movements. Minimum air temperature and 24-hr. precipitation influenced adult A. jeffersonianum and A. platineum movements, whereas wetland depth (a surrogate for hydroperiod) influenced metamorph emigration. Increases in soil inversion strength promoted A. laterale adult movements. To estimate A. jeffersonianum population reproductive characteristics, I combined census and fertility data over three years. Fertility estimates for two wetlands ranged from 0.29 to 1.94, possibly due to hydroperiod. Fertility estimates for both wetlands surveyed were larger than previous studies conducted in the same region. A potential reason for the higher fertility is the restoration efforts aimed at wetland creation and increasing the hydroperiod of existing wetlands. Ultimately, my results can inform future restoration efforts on the timing of prescribed burns and illustrate the potential benefits of habitat restoration on population demographics for wetland-breeding amphibians.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-01-12 without embargo terms","The student, Shay Callahan, accepted the attached license on 2021-07-19 at 16:41.","The student, Shay Callahan, submitted this Thesis for approval on 2021-07-19 at 16:58.","This Thesis was approved for publication on 2021-07-21 at 08:59.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17017 on 2022-01-12 at 12:46:20"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Migration phenology and fertility of imperiled Illinois salamander (Ambystoma) species"]}]}],"canonical_facts":{"dc:contributor":["Dreslik, Michael J","Crawford, John A"],"dc:creator":["Callahan, Shay Anna"],"dc:date":["2022-01-12T21:46:56Z","2021-07-21","2021-08"],"dc:description":["Made available in DSpace on 2022-01-12T21:46:56Z (GMT). No. of bitstreams: 2 CALLAHAN-THESIS-2021.pdf: 2826996 bytes, checksum: 5cc241706b5a8e00e8dc8731cde47fc3 (MD5) LICENSE.txt: 4210 bytes, checksum: 284778725358f3904105b35f49d32554 (MD5) Previous issue date: 2021-07-21","Habitat loss is the primary driver of global amphibian declines. Habitat restoration and management of aquatic and terrestrial habitats are underway in Illinois, where over 90% of wetlands have been lost. Demographic and phenologic data are needed to inform land management decisions, such as the timing of controlled burns, to help avoid causing harm to amphibians moving between aquatic and terrestrial habitats (and vice versa). Interfering, stressing, or causing mortality of migrating adults could result in cascading effects on reproduction and recruitment. The Jefferson Salamander (Ambystoma jeffersonianum), Silvery Salamander (A. platineum), and Blue-spotted Salamander (A. laterale) are three species of conservation concern in Illinois that migrate annually from upland habitat to wetlands for reproduction. Juveniles (metamorphs) subsequently emigrate from wetlands to terrestrial habitats after metamorphosis. I conducted a census for each species over three years to understand the environmental factors influencing adult and juvenile movements. Minimum air temperature and 24-hr. precipitation influenced adult A. jeffersonianum and A. platineum movements, whereas wetland depth (a surrogate for hydroperiod) influenced metamorph emigration. Increases in soil inversion strength promoted A. laterale adult movements. To estimate A. jeffersonianum population reproductive characteristics, I combined census and fertility data over three years. Fertility estimates for two wetlands ranged from 0.29 to 1.94, possibly due to hydroperiod. Fertility estimates for both wetlands surveyed were larger than previous studies conducted in the same region. A potential reason for the higher fertility is the restoration efforts aimed at wetland creation and increasing the hydroperiod of existing wetlands. Ultimately, my results can inform future restoration efforts on the timing of prescribed burns and illustrate the potential benefits of habitat restoration on population demographics for wetland-breeding amphibians.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-01-12 without embargo terms","The student, Shay Callahan, accepted the attached license on 2021-07-19 at 16:41.","The student, Shay Callahan, submitted this Thesis for approval on 2021-07-19 at 16:58.","This Thesis was approved for publication on 2021-07-21 at 08:59.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17017 on 2022-01-12 at 12:46:20"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/113075"],"dc:language":["en"],"dc:rights":["Copyright 2021 Shay Callahan"],"dc:subject":["Phenology","Migration","Ambystoma","Mole salamander","Fertility","Mark and Recapture"],"dc:title":["Migration phenology and fertility of imperiled Illinois salamander (Ambystoma) species"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Natural Res & Env Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:53Z"}