{"id":{"repo_id":"drake","oai_identifier":"oai:escholarshare.drake.edu:2092/338"},"canonical_url":"https://search.dev.ndltd.org/etd/drake/oai:escholarshare.drake.edu:2092/338","repository":{"repo_id":"drake","name":"Drake University","base_url":"https://escholarshare.drake.edu/server/oai/request"},"display":{"title":"Distinguishing the Treefrogs \"Hyla versicolor\" and \"Hyla chrysoscelis\" in Iowa, and Their Distributions","abstract":"Historically, the tetraploid and diploid species pair of treefrogs, \"Hyla versicolor\" and \"Hyla chrysoscelis\" have been mapped collectively in Iowa because no distinguishing macroscopic morphological characteristics useful in recognizing the two species had been found. The present study reports identification and separation of the species by counts of stained nucleoli and measurement of scanning electron micrographs of toepad projections. The resulting distribution correlates with spot checks of call analysis. Subsequent morphometric data confirm that the two species represent two distinct populations in Iowa. \"H. chrysoscelis\" is distributed sporadically through the southwestern half of Iowa while \"H. versicolor\" is limited to the southeastern half of the state. This study suggests a decline of these species in extreme northern Iowa.","abstract_html":"Historically, the tetraploid and diploid species pair of treefrogs, "Hyla versicolor" and "Hyla chrysoscelis" have been mapped collectively in Iowa because no distinguishing macroscopic morphological characteristics useful in recognizing the two species had been found. The present study reports identification and separation of the species by counts of stained nucleoli and measurement of scanning electron micrographs of toepad projections. The resulting distribution correlates with spot checks of call analysis. Subsequent morphometric data confirm that the two species represent two distinct populations in Iowa. "H. chrysoscelis" is distributed sporadically through the southwestern half of Iowa while "H. versicolor" is limited to the southeastern half of the state. This study suggests a decline of these species in extreme northern Iowa.","abstract_has_math":false,"creators":["Oberfoell, Catherine E.C."],"institution":"Drake University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1997,"date_issued":"1997-05","date_published":"1997-05","updated_at":"2026-07-27T19:19:47Z","subjects":["Hyla versicolor.","Hyla chrysoscelis.","Frogs--Iowa."],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["1997 .O2"],"render_values":[{"text":"1997 .O2","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2092/338","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Oberfoell, Catherine E.C."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2006-03-15T17:09:07Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2006-03-15T17:09:07Z"]},{"key":"dc:date.issued","label":"Date","values":["1997-05"]},{"key":"dc:publisher","label":"Institution","values":["Drake University"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Hyla versicolor.","Hyla chrysoscelis.","Frogs--Iowa."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["1997 .O2"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/2092/338"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["[iv], 36 leaves. Advisor: James L. Christiansen."]},{"key":"dc:description.abstract","label":"Abstract","values":["Historically, the tetraploid and diploid species pair of treefrogs, \"Hyla versicolor\" and \"Hyla chrysoscelis\" have been mapped collectively in Iowa because no distinguishing macroscopic morphological characteristics useful in recognizing the two species had been found. The present study reports identification and separation of the species by counts of stained nucleoli and measurement of scanning electron micrographs of toepad projections. The resulting distribution correlates with spot checks of call analysis. Subsequent morphometric data confirm that the two species represent two distinct populations in Iowa. \"H. chrysoscelis\" is distributed sporadically through the southwestern half of Iowa while \"H. versicolor\" is limited to the southeastern half of the state. This study suggests a decline of these species in extreme northern Iowa."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Distinguishing the Treefrogs \"Hyla versicolor\" and \"Hyla chrysoscelis\" in Iowa, and Their Distributions"]}]}],"canonical_facts":{"dc:creator":["Oberfoell, Catherine E.C."],"dc:date.accessioned":["2006-03-15T17:09:07Z"],"dc:date.available":["2006-03-15T17:09:07Z"],"dc:date.issued":["1997-05"],"dc:description":["[iv], 36 leaves. Advisor: James L. Christiansen."],"dc:description.abstract":["Historically, the tetraploid and diploid species pair of treefrogs, \"Hyla versicolor\" and \"Hyla chrysoscelis\" have been mapped collectively in Iowa because no distinguishing macroscopic morphological characteristics useful in recognizing the two species had been found. The present study reports identification and separation of the species by counts of stained nucleoli and measurement of scanning electron micrographs of toepad projections. The resulting distribution correlates with spot checks of call analysis. Subsequent morphometric data confirm that the two species represent two distinct populations in Iowa. \"H. chrysoscelis\" is distributed sporadically through the southwestern half of Iowa while \"H. versicolor\" is limited to the southeastern half of the state. This study suggests a decline of these species in extreme northern Iowa."],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["1997 .O2"],"dc:identifier.uri":["http://hdl.handle.net/2092/338"],"dc:language.iso":["en_US"],"dc:publisher":["Drake University"],"dc:subject":["Hyla versicolor.","Hyla chrysoscelis.","Frogs--Iowa."],"dc:title":["Distinguishing the Treefrogs \"Hyla versicolor\" and \"Hyla chrysoscelis\" in Iowa, and Their Distributions"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T19:19:47Z"}