{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/120147"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/120147","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Investigating the mechanism of a non-consumptive effect of a predator on the disease dynamics of its prey","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","abstract_has_math":false,"creators":["Hearon, Luke"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Entomology","degree_department":null,"school":null,"contributors":["Cáceres, Carla","Allan, Brian","Dolezal, Adam"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-05","date_published":"2023-05","updated_at":"2026-07-22T22:24:56Z","subjects":["Predator-prey","Entomology","Kairomone","Infochemical","Disease Ecology","Trade-off"],"languages":["en","eng"],"rights":["Copyright 2023 Luke Hearon"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/120147","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Cáceres, Carla","Allan, Brian","Dolezal, Adam"]},{"key":"dc:creator","label":"Author","values":["Hearon, Luke"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-05","2023-05-01"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Entomology"]},{"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":["Predator-prey","Entomology","Kairomone","Infochemical","Disease Ecology","Trade-off"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Luke Hearon"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/120147"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","The student, Luke Hearon, accepted the attached license on 2023-04-28 at 16:43.","The student, Luke Hearon, submitted this Thesis for approval on 2023-04-28 at 16:52.","This Thesis was approved for publication on 2023-05-01 at 17:31.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19259 on 2023-09-01 at 16:56:01","Predators frequently affect their prey through non-consumptive pathways. These non-consumptive effects can cause shifts in behavior and physiology that alter the disease dynamics in the prey population. In the Chaoborus–Daphnia–Metschnikowia predator–prey-host–pathogen system, the presence of Chaoborus cues increases the susceptibility of Daphnia to infection by Metschnikowia, but the mechanism of this effect is yet unknown. This study investigated two potential mechanisms. Firstly, authors previously observing the non-consumptive effect on infection have hypothesized, but not directly tested, that it is the result of increased feeding rate, either due to increased foraging behavior or due to increased body size in the presence of the cue. Secondly, I hypothesize that the morphological defenses reported to be produced in the presence of Chaoborus kairomone cause a resource allocation trade-off between defense production and immune function. I tested these hypotheses by rearing Daphnia in a factorial design in the presence/absence of Chaoborus kairomone and the presence/absence of Metschnikowia spores, measuring life history traits, morphology, and feeding rate. My results did not support either hypothesis. While kairomone increased infection rate, feeding behavior did not increase, nor did body size. Morphological defenses were not produced in response to the kairomone, yet infection still increased. While the mechanism of the Chaoborus kairomone on Daphnia infection remains unknown, I have tested and rejected two likely hypotheses as to its functioning."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Investigating the mechanism of a non-consumptive effect of a predator on the disease dynamics of its prey"]}]}],"canonical_facts":{"dc:contributor":["Cáceres, Carla","Allan, Brian","Dolezal, Adam"],"dc:creator":["Hearon, Luke"],"dc:date":["2023-05","2023-05-01"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms","The student, Luke Hearon, accepted the attached license on 2023-04-28 at 16:43.","The student, Luke Hearon, submitted this Thesis for approval on 2023-04-28 at 16:52.","This Thesis was approved for publication on 2023-05-01 at 17:31.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19259 on 2023-09-01 at 16:56:01","Predators frequently affect their prey through non-consumptive pathways. These non-consumptive effects can cause shifts in behavior and physiology that alter the disease dynamics in the prey population. In the Chaoborus–Daphnia–Metschnikowia predator–prey-host–pathogen system, the presence of Chaoborus cues increases the susceptibility of Daphnia to infection by Metschnikowia, but the mechanism of this effect is yet unknown. This study investigated two potential mechanisms. Firstly, authors previously observing the non-consumptive effect on infection have hypothesized, but not directly tested, that it is the result of increased feeding rate, either due to increased foraging behavior or due to increased body size in the presence of the cue. Secondly, I hypothesize that the morphological defenses reported to be produced in the presence of Chaoborus kairomone cause a resource allocation trade-off between defense production and immune function. I tested these hypotheses by rearing Daphnia in a factorial design in the presence/absence of Chaoborus kairomone and the presence/absence of Metschnikowia spores, measuring life history traits, morphology, and feeding rate. My results did not support either hypothesis. While kairomone increased infection rate, feeding behavior did not increase, nor did body size. Morphological defenses were not produced in response to the kairomone, yet infection still increased. While the mechanism of the Chaoborus kairomone on Daphnia infection remains unknown, I have tested and rejected two likely hypotheses as to its functioning."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/120147"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Luke Hearon"],"dc:subject":["Predator-prey","Entomology","Kairomone","Infochemical","Disease Ecology","Trade-off"],"dc:title":["Investigating the mechanism of a non-consumptive effect of a predator on the disease dynamics of its prey"],"dc:type":["text"],"thesis:degree_discipline":["Entomology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:56Z"}