{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/105885"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/105885","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Linking behavior and diet between and within populations of an invasive crayfish faxonius rusticus","abstract":"This Thesis was approved for publication on 2019-07-01 at 16:29.","abstract_html":"This Thesis was approved for publication on 2019-07-01 at 16:29.","abstract_has_math":false,"creators":["Adey, Amaryllis K."],"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":["Larson, Eric R","Taylor, Christopher A","Fuller, Rebecca C"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-11-26T20:58:34Z","date_published":"2019-11-26T20:58:34Z","updated_at":"2026-07-22T22:24:45Z","subjects":["Behavior","Crayfish","Diet"],"languages":["en"],"rights":["Copyright 2019 Amaryllis Adey"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/105885","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Larson, Eric R","Taylor, Christopher A","Fuller, Rebecca C"]},{"key":"dc:creator","label":"Author","values":["Adey, Amaryllis K."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-11-26T20:58:34Z","2019-07-01","2019-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"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":["Behavior","Crayfish","Diet"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Amaryllis Adey"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/105885"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This Thesis was approved for publication on 2019-07-01 at 16:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14108 on 2019-11-26 at 14:00:39","Made available in DSpace on 2019-11-26T20:58:34Z (GMT). No. of bitstreams: 2 ADEY-THESIS-2019.pdf: 1271458 bytes, checksum: 3a108e470db8e46af2dd7e9e6cd933ff (MD5) LICENSE.txt: 4211 bytes, checksum: a6adbd4de69183a35aa7dc0d6181acb8 (MD5) Previous issue date: 2019-07-01","Embargo set by: Seth Robbins for item 113031 Lift date: 2021-11-26T20:58:44Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 113031 Lift date: 2021-11-26T20:59:54Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Open Restriction set for Item 113031 on 2021-01-20T23:00:12Z with date null by madinag@illinois.edu.","Open Restriction set for Item 113031 on 2021-01-20T23:00:18Z with date null by madinag@illinois.edu.","Open","Laboratory and mesocosm studies are often employed to study basic and applied ecology due to the complexities and lack of external controls in field environments. However, studies conducted on the same questions at different scales do not always have the same results. In my thesis, I used stable isotopes to relate laboratory behavior to field function within and between populations. In my first study, I explored whether stable isotopes of carbon and nitrogen could be used to relate laboratory dominance of Rusty Crayfish Faxonius rusticus to their field diet. I assessed whether methodological decisions around tissue analyzed for stable isotopes, laboratory acclimation time, and timing of primary consumer collection affects this relationship. I hypothesized that more dominant crayfish would have higher trophic positions, and tissues with faster turnover rates may exhibit a stronger association between laboratory behavior and recent field function. I failed to find a relationship regardless of these different methodological choices However, I still find this method promising, as other laboratory behaviors may be more related to diet or competition for food, such as exploration or feeding flexibility. In my second study, I expanded this method of relating behavior to diet through stable isotope analysis for questions between, rather than within, populations of F. rusticus. Here, I aimed to determine the relationship between individual specialization and relative population abundances or intraspecific competition. Theoretical studies propose a direct, positive relationship between abundance and individual specialization; however, empirical studies have not always supported these predictions. I assessed behavioral and dietary specialization across a gradient of relative population abundances of F. rusticus. I found a unimodal relationship between relative abundance and dietary specialization, likely due to limited food resources in high abundance lakes. Alternatively, I found a positive linear relationship between relative abundance and behavioral specialization, because this metric of individual specialization is not resource limited (i.e. density dependent). These results indicate that discrepancies between theoretical and empirical studies of the relationship between individual specialization and intraspecific competition might be a consequence of the metric of specialization used. My thesis shows that linking organismal diet and behavior with stable isotopes may be a useful approach in ecology and evolution, but may be best applied to questions between rather than within populations.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-08-01","The student, Amaryllis Adey, accepted the attached license on 2019-06-28 at 13:53.","The student, Amaryllis Adey, submitted this Thesis for approval on 2019-06-29 at 16:07."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Linking behavior and diet between and within populations of an invasive crayfish faxonius rusticus"]}]}],"canonical_facts":{"dc:contributor":["Larson, Eric R","Taylor, Christopher A","Fuller, Rebecca C"],"dc:creator":["Adey, Amaryllis K."],"dc:date":["2019-11-26T20:58:34Z","2019-07-01","2019-08"],"dc:description":["This Thesis was approved for publication on 2019-07-01 at 16:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14108 on 2019-11-26 at 14:00:39","Made available in DSpace on 2019-11-26T20:58:34Z (GMT). No. of bitstreams: 2 ADEY-THESIS-2019.pdf: 1271458 bytes, checksum: 3a108e470db8e46af2dd7e9e6cd933ff (MD5) LICENSE.txt: 4211 bytes, checksum: a6adbd4de69183a35aa7dc0d6181acb8 (MD5) Previous issue date: 2019-07-01","Embargo set by: Seth Robbins for item 113031 Lift date: 2021-11-26T20:58:44Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 113031 Lift date: 2021-11-26T20:59:54Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Open Restriction set for Item 113031 on 2021-01-20T23:00:12Z with date null by madinag@illinois.edu.","Open Restriction set for Item 113031 on 2021-01-20T23:00:18Z with date null by madinag@illinois.edu.","Open","Laboratory and mesocosm studies are often employed to study basic and applied ecology due to the complexities and lack of external controls in field environments. However, studies conducted on the same questions at different scales do not always have the same results. In my thesis, I used stable isotopes to relate laboratory behavior to field function within and between populations. In my first study, I explored whether stable isotopes of carbon and nitrogen could be used to relate laboratory dominance of Rusty Crayfish Faxonius rusticus to their field diet. I assessed whether methodological decisions around tissue analyzed for stable isotopes, laboratory acclimation time, and timing of primary consumer collection affects this relationship. I hypothesized that more dominant crayfish would have higher trophic positions, and tissues with faster turnover rates may exhibit a stronger association between laboratory behavior and recent field function. I failed to find a relationship regardless of these different methodological choices However, I still find this method promising, as other laboratory behaviors may be more related to diet or competition for food, such as exploration or feeding flexibility. In my second study, I expanded this method of relating behavior to diet through stable isotope analysis for questions between, rather than within, populations of F. rusticus. Here, I aimed to determine the relationship between individual specialization and relative population abundances or intraspecific competition. Theoretical studies propose a direct, positive relationship between abundance and individual specialization; however, empirical studies have not always supported these predictions. I assessed behavioral and dietary specialization across a gradient of relative population abundances of F. rusticus. I found a unimodal relationship between relative abundance and dietary specialization, likely due to limited food resources in high abundance lakes. Alternatively, I found a positive linear relationship between relative abundance and behavioral specialization, because this metric of individual specialization is not resource limited (i.e. density dependent). These results indicate that discrepancies between theoretical and empirical studies of the relationship between individual specialization and intraspecific competition might be a consequence of the metric of specialization used. My thesis shows that linking organismal diet and behavior with stable isotopes may be a useful approach in ecology and evolution, but may be best applied to questions between rather than within populations.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-08-01","The student, Amaryllis Adey, accepted the attached license on 2019-06-28 at 13:53.","The student, Amaryllis Adey, submitted this Thesis for approval on 2019-06-29 at 16:07."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/105885"],"dc:language":["en"],"dc:rights":["Copyright 2019 Amaryllis Adey"],"dc:subject":["Behavior","Crayfish","Diet"],"dc:title":["Linking behavior and diet between and within populations of an invasive crayfish faxonius rusticus"],"dc:type":["text"],"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":"2026-07-22T22:24:45Z"}