{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/86550"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/86550","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Morphometric Theory and Application to Evolution and Biogeography in Argopecten (Bivalvai: Pectinidae) From the Southeastern United States","abstract":"Evolution in the Argopecten irradians lineage shows early onset of circular disk morphologies similar to modern forms, with subsequent evolution through punctuated selection against more archaic (asymmetrical) morphologies, likely associated with Pleistocene glaciations. That speciation mirrors macroevolution suggests self-similarity in evolution. Convergence on circular disk shape (a local maximum of swimming efficiency) seen in numerous pectinid lineages implies adaptative evolution and precludes genetic drift.","abstract_html":"Evolution in the Argopecten irradians lineage shows early onset of circular disk morphologies similar to modern forms, with subsequent evolution through punctuated selection against more archaic (asymmetrical) morphologies, likely associated with Pleistocene glaciations. That speciation mirrors macroevolution suggests self-similarity in evolution. Convergence on circular disk shape (a local maximum of swimming efficiency) seen in numerous pectinid lineages implies adaptative evolution and precludes genetic drift.","abstract_has_math":false,"creators":["Werner, John Edward"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Jay Bass","Blake, Daniel B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T15:12:36Z","date_published":"2015-09-28T15:12:36Z","updated_at":"2026-07-22T22:26:27Z","subjects":["Biology, Zoology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9904619"],"render_values":[{"text":"(MiAaPQ)AAI9904619","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/86550","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Jay Bass","Blake, Daniel B."]},{"key":"dc:creator","label":"Author","values":["Werner, John Edward"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T15:12:36Z","10000-01-01","1998"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"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, Zoology"]}]},{"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/2142/86550","(MiAaPQ)AAI9904619"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Evolution in the Argopecten irradians lineage shows early onset of circular disk morphologies similar to modern forms, with subsequent evolution through punctuated selection against more archaic (asymmetrical) morphologies, likely associated with Pleistocene glaciations. That speciation mirrors macroevolution suggests self-similarity in evolution. Convergence on circular disk shape (a local maximum of swimming efficiency) seen in numerous pectinid lineages implies adaptative evolution and precludes genetic drift.","Made available in DSpace on 2015-09-28T15:12:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9904619.pdf: 3975206 bytes, checksum: e603585aa042fba780b98cb8cd0a9ddc (MD5) Previous issue date: 1998","Embargo set by: Seth Robbins for item 87831 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","138 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998."]},{"key":"dc:title","label":"Title","values":["Morphometric Theory and Application to Evolution and Biogeography in Argopecten (Bivalvai: Pectinidae) From the Southeastern United States"]}]}],"canonical_facts":{"dc:contributor":["Jay Bass","Blake, Daniel B."],"dc:creator":["Werner, John Edward"],"dc:date":["2015-09-28T15:12:36Z","10000-01-01","1998"],"dc:description":["Evolution in the Argopecten irradians lineage shows early onset of circular disk morphologies similar to modern forms, with subsequent evolution through punctuated selection against more archaic (asymmetrical) morphologies, likely associated with Pleistocene glaciations. That speciation mirrors macroevolution suggests self-similarity in evolution. Convergence on circular disk shape (a local maximum of swimming efficiency) seen in numerous pectinid lineages implies adaptative evolution and precludes genetic drift.","Made available in DSpace on 2015-09-28T15:12:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9904619.pdf: 3975206 bytes, checksum: e603585aa042fba780b98cb8cd0a9ddc (MD5) Previous issue date: 1998","Embargo set by: Seth Robbins for item 87831 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","138 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998."],"dc:identifier":["http://hdl.handle.net/2142/86550","(MiAaPQ)AAI9904619"],"dc:language":["eng"],"dc:subject":["Biology, Zoology"],"dc:title":["Morphometric Theory and Application to Evolution and Biogeography in Argopecten (Bivalvai: Pectinidae) From the Southeastern United States"],"dc:type":["text"],"thesis:degree_discipline":["Geology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:27Z"}