{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/87116"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/87116","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The Effects of Two Polychlorinated Biphenyl Mixtures on Honey Bee (Apis Mellifera) Foraging Behavior and Hypopharyngeal Gland Development","abstract":"The honey bee is a novel model in which to study physiological and behavioral changes that may have a hormonal influence. This dissertation focused on the effects of two PCB mixtures, Aroclor 1242 and 1254, on the European honey bee, Apis mellifera, as there is evidence that these compounds disrupt hormonal function in endocrine systems of mammals. After testing the dose range 0--80 mug/bee of A1242 and 0--1000 mug/bee of A1254, the LD20 for each PCB mixture was identified as 20 mug/bee and 100 mug/bee for A1242 and A1254, respectively. We then examined whether these doses affected the development of the hypopharyngeal gland and/or foraging behavior. Residue analysis was completed on bees exposed to the LD20 for each PCB mixture. In addition to being more toxic, A1242 was more quickly absorbed and excreted by the honey bee than A1254. Because honey bees appear to be more sensitive to A1242 than A1254, subsequent studies on the hypopharyngeal gland concentrated on A1242. Exposure of bees to 20 mug of A1242 produced an acceleration of age-related increases in alpha-glucosidase activity, acinar diameter, and wet weights of the hypopharyngeal gland when compared to controls. There was no evidence of precocious foraging following exposure to either A1242 or A1254. These studies provide new information on the behavioral and physiological effects of PCBs on honey bee populations. I conclude that exposure to sublethal doses of A1242 or A1254 is unlikely to impact U.S. bee populations.","abstract_html":"The honey bee is a novel model in which to study physiological and behavioral changes that may have a hormonal influence. This dissertation focused on the effects of two PCB mixtures, Aroclor 1242 and 1254, on the European honey bee, Apis mellifera, as there is evidence that these compounds disrupt hormonal function in endocrine systems of mammals. After testing the dose range 0--80 mug/bee of A1242 and 0--1000 mug/bee of A1254, the LD20 for each PCB mixture was identified as 20 mug/bee and 100 mug/bee for A1242 and A1254, respectively. We then examined whether these doses affected the development of the hypopharyngeal gland and/or foraging behavior. Residue analysis was completed on bees exposed to the LD20 for each PCB mixture. In addition to being more toxic, A1242 was more quickly absorbed and excreted by the honey bee than A1254. Because honey bees appear to be more sensitive to A1242 than A1254, subsequent studies on the hypopharyngeal gland concentrated on A1242. Exposure of bees to 20 mug of A1242 produced an acceleration of age-related increases in alpha-glucosidase activity, acinar diameter, and wet weights of the hypopharyngeal gland when compared to controls. There was no evidence of precocious foraging following exposure to either A1242 or A1254. These studies provide new information on the behavioral and physiological effects of PCBs on honey bee populations. I conclude that exposure to sublethal doses of A1242 or A1254 is unlikely to impact U.S. bee populations.","abstract_has_math":false,"creators":["Rosiak, Kimberly Lynne"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Veterinary Clinical Medicine","degree_department":null,"school":null,"contributors":["Susan Fahrbach"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T15:38:24Z","date_published":"2015-09-28T15:38:24Z","updated_at":"2026-07-22T22:26:28Z","subjects":["Biology, Zoology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3044212"],"render_values":[{"text":"(MiAaPQ)AAI3044212","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/87116","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Susan Fahrbach"]},{"key":"dc:creator","label":"Author","values":["Rosiak, Kimberly Lynne"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T15:38:24Z","10000-01-01","2002"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Veterinary Clinical Medicine"]},{"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/2142/87116","(MiAaPQ)AAI3044212"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The honey bee is a novel model in which to study physiological and behavioral changes that may have a hormonal influence. This dissertation focused on the effects of two PCB mixtures, Aroclor 1242 and 1254, on the European honey bee, Apis mellifera, as there is evidence that these compounds disrupt hormonal function in endocrine systems of mammals. After testing the dose range 0--80 mug/bee of A1242 and 0--1000 mug/bee of A1254, the LD20 for each PCB mixture was identified as 20 mug/bee and 100 mug/bee for A1242 and A1254, respectively. We then examined whether these doses affected the development of the hypopharyngeal gland and/or foraging behavior. Residue analysis was completed on bees exposed to the LD20 for each PCB mixture. In addition to being more toxic, A1242 was more quickly absorbed and excreted by the honey bee than A1254. Because honey bees appear to be more sensitive to A1242 than A1254, subsequent studies on the hypopharyngeal gland concentrated on A1242. Exposure of bees to 20 mug of A1242 produced an acceleration of age-related increases in alpha-glucosidase activity, acinar diameter, and wet weights of the hypopharyngeal gland when compared to controls. There was no evidence of precocious foraging following exposure to either A1242 or A1254. These studies provide new information on the behavioral and physiological effects of PCBs on honey bee populations. I conclude that exposure to sublethal doses of A1242 or A1254 is unlikely to impact U.S. bee populations.","Made available in DSpace on 2015-09-28T15:38:24Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3044212.pdf: 3825236 bytes, checksum: 145fd9b32b1b820280a9d5828fb42907 (MD5) Previous issue date: 2002","Embargo set by: Seth Robbins for item 88397 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","85 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002."]},{"key":"dc:title","label":"Title","values":["The Effects of Two Polychlorinated Biphenyl Mixtures on Honey Bee (Apis Mellifera) Foraging Behavior and Hypopharyngeal Gland Development"]}]}],"canonical_facts":{"dc:contributor":["Susan Fahrbach"],"dc:creator":["Rosiak, Kimberly Lynne"],"dc:date":["2015-09-28T15:38:24Z","10000-01-01","2002"],"dc:description":["The honey bee is a novel model in which to study physiological and behavioral changes that may have a hormonal influence. This dissertation focused on the effects of two PCB mixtures, Aroclor 1242 and 1254, on the European honey bee, Apis mellifera, as there is evidence that these compounds disrupt hormonal function in endocrine systems of mammals. After testing the dose range 0--80 mug/bee of A1242 and 0--1000 mug/bee of A1254, the LD20 for each PCB mixture was identified as 20 mug/bee and 100 mug/bee for A1242 and A1254, respectively. We then examined whether these doses affected the development of the hypopharyngeal gland and/or foraging behavior. Residue analysis was completed on bees exposed to the LD20 for each PCB mixture. In addition to being more toxic, A1242 was more quickly absorbed and excreted by the honey bee than A1254. Because honey bees appear to be more sensitive to A1242 than A1254, subsequent studies on the hypopharyngeal gland concentrated on A1242. Exposure of bees to 20 mug of A1242 produced an acceleration of age-related increases in alpha-glucosidase activity, acinar diameter, and wet weights of the hypopharyngeal gland when compared to controls. There was no evidence of precocious foraging following exposure to either A1242 or A1254. These studies provide new information on the behavioral and physiological effects of PCBs on honey bee populations. I conclude that exposure to sublethal doses of A1242 or A1254 is unlikely to impact U.S. bee populations.","Made available in DSpace on 2015-09-28T15:38:24Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3044212.pdf: 3825236 bytes, checksum: 145fd9b32b1b820280a9d5828fb42907 (MD5) Previous issue date: 2002","Embargo set by: Seth Robbins for item 88397 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","85 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002."],"dc:identifier":["http://hdl.handle.net/2142/87116","(MiAaPQ)AAI3044212"],"dc:language":["eng"],"dc:subject":["Biology, Zoology"],"dc:title":["The Effects of Two Polychlorinated Biphenyl Mixtures on Honey Bee (Apis Mellifera) Foraging Behavior and Hypopharyngeal Gland Development"],"dc:type":["text"],"thesis:degree_discipline":["Veterinary Clinical Medicine"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:28Z"}