{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101120"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101120","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Demography of the spotted turtle (clemmys guttata) in Illinois","abstract":"The Spotted Turtle (Clemmys guttata) has been well-documented and studied at two locations in Will County, Illinois, since 1987. Although spatial and reproductive ecology are relatively well understood, there remains no comprehensive demographic analysis of the two populations. I investigated the population size, structure, and demographic behavior of C. guttata populations at Lockport and Romeoville Prairie Nature Preserves by supplementing an existing dataset by conducting capture-mark-recapture in 2015–2016. I used the subsequent capture and reproductive data spanning 1988–2016 and Package RMark to analyze deterministic measures of change for both populations. Both populations exhibited an even sex ratio, a strong bias towards adults, and positive growth over the length of the study. I used a POPAN model to estimate the population size to be 116 individuals in 2010 at Romeoville and 99 individuals in 2016 at Lockport. I employed the CJSRandom model in RMark to determine age-specific survival and coupled the estimates with age-specific fecundity to create a female-only, deterministic Leslie matrix model for each population and subsequently conducted a perturbation analysis and population projection. Population growth was most sensitive to survival rates for the youngest age class and most elastic to pre-adult survival for both populations, which corroborates results on C. guttata from the species’ northern range limit and contradicts the general trend for long-lived turtle species. Neither population appears demographically viable in the long-term although their short-term dynamics appear stable.","abstract_html":"The Spotted Turtle (Clemmys guttata) has been well-documented and studied at two locations in Will County, Illinois, since 1987. Although spatial and reproductive ecology are relatively well understood, there remains no comprehensive demographic analysis of the two populations. I investigated the population size, structure, and demographic behavior of C. guttata populations at Lockport and Romeoville Prairie Nature Preserves by supplementing an existing dataset by conducting capture-mark-recapture in 2015–2016. I used the subsequent capture and reproductive data spanning 1988–2016 and Package RMark to analyze deterministic measures of change for both populations. Both populations exhibited an even sex ratio, a strong bias towards adults, and positive growth over the length of the study. I used a POPAN model to estimate the population size to be 116 individuals in 2010 at Romeoville and 99 individuals in 2016 at Lockport. I employed the CJSRandom model in RMark to determine age-specific survival and coupled the estimates with age-specific fecundity to create a female-only, deterministic Leslie matrix model for each population and subsequently conducted a perturbation analysis and population projection. Population growth was most sensitive to survival rates for the youngest age class and most elastic to pre-adult survival for both populations, which corroborates results on C. guttata from the species’ northern range limit and contradicts the general trend for long-lived turtle species. Neither population appears demographically viable in the long-term although their short-term dynamics appear stable.","abstract_has_math":false,"creators":["Feng, Christina Yen"],"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":["Dreslik, Michael J.","Phillips, Christopher A.","Suski, Cory D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-04T20:33:50Z","date_published":"2018-09-04T20:33:50Z","updated_at":"2026-07-22T22:24:38Z","subjects":["Spotted Turtle","Clemmys guttata","turtle","demography"],"languages":["en"],"rights":["Copyright 2018 Christina Feng"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101120","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dreslik, Michael J.","Phillips, Christopher A.","Suski, Cory D."]},{"key":"dc:creator","label":"Author","values":["Feng, Christina Yen"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-04T20:33:50Z","2020-09-05T09:15:17Z","2018-03-09","2018-05"]},{"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":["Spotted Turtle","Clemmys guttata","turtle","demography"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Christina Feng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101120"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The Spotted Turtle (Clemmys guttata) has been well-documented and studied at two locations in Will County, Illinois, since 1987. Although spatial and reproductive ecology are relatively well understood, there remains no comprehensive demographic analysis of the two populations. I investigated the population size, structure, and demographic behavior of C. guttata populations at Lockport and Romeoville Prairie Nature Preserves by supplementing an existing dataset by conducting capture-mark-recapture in 2015–2016. I used the subsequent capture and reproductive data spanning 1988–2016 and Package RMark to analyze deterministic measures of change for both populations. Both populations exhibited an even sex ratio, a strong bias towards adults, and positive growth over the length of the study. I used a POPAN model to estimate the population size to be 116 individuals in 2010 at Romeoville and 99 individuals in 2016 at Lockport. I employed the CJSRandom model in RMark to determine age-specific survival and coupled the estimates with age-specific fecundity to create a female-only, deterministic Leslie matrix model for each population and subsequently conducted a perturbation analysis and population projection. Population growth was most sensitive to survival rates for the youngest age class and most elastic to pre-adult survival for both populations, which corroborates results on C. guttata from the species’ northern range limit and contradicts the general trend for long-lived turtle species. Neither population appears demographically viable in the long-term although their short-term dynamics appear stable.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Christina Feng, accepted the attached license on 2018-03-07 at 16:49.","The student, Christina Feng, submitted this Thesis for approval on 2018-03-07 at 17:04.","This Thesis was approved for publication on 2018-03-09 at 10:05.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12058 on 2018-08-31 at 17:17:14","Made available in DSpace on 2018-09-04T20:33:50Z (GMT). No. of bitstreams: 2 FENG-THESIS-2018.pdf: 2272779 bytes, checksum: c956990dd536561340663b89a041e826 (MD5) LICENSE.txt: 4211 bytes, checksum: c81ec072a36afbb1eb49b199ba91005f (MD5) Previous issue date: 2018-03-09","Embargo set by: Seth Robbins for item 107203 Lift date: 2020-09-04T20:34:13Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 107203 Lift date: 2020-09-04T20:37:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 107203 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 107203 on 2020-09-05T09:15:17Z."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Demography of the spotted turtle (clemmys guttata) in Illinois"]}]}],"canonical_facts":{"dc:contributor":["Dreslik, Michael J.","Phillips, Christopher A.","Suski, Cory D."],"dc:creator":["Feng, Christina Yen"],"dc:date":["2018-09-04T20:33:50Z","2020-09-05T09:15:17Z","2018-03-09","2018-05"],"dc:description":["The Spotted Turtle (Clemmys guttata) has been well-documented and studied at two locations in Will County, Illinois, since 1987. Although spatial and reproductive ecology are relatively well understood, there remains no comprehensive demographic analysis of the two populations. I investigated the population size, structure, and demographic behavior of C. guttata populations at Lockport and Romeoville Prairie Nature Preserves by supplementing an existing dataset by conducting capture-mark-recapture in 2015–2016. I used the subsequent capture and reproductive data spanning 1988–2016 and Package RMark to analyze deterministic measures of change for both populations. Both populations exhibited an even sex ratio, a strong bias towards adults, and positive growth over the length of the study. I used a POPAN model to estimate the population size to be 116 individuals in 2010 at Romeoville and 99 individuals in 2016 at Lockport. I employed the CJSRandom model in RMark to determine age-specific survival and coupled the estimates with age-specific fecundity to create a female-only, deterministic Leslie matrix model for each population and subsequently conducted a perturbation analysis and population projection. Population growth was most sensitive to survival rates for the youngest age class and most elastic to pre-adult survival for both populations, which corroborates results on C. guttata from the species’ northern range limit and contradicts the general trend for long-lived turtle species. Neither population appears demographically viable in the long-term although their short-term dynamics appear stable.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Christina Feng, accepted the attached license on 2018-03-07 at 16:49.","The student, Christina Feng, submitted this Thesis for approval on 2018-03-07 at 17:04.","This Thesis was approved for publication on 2018-03-09 at 10:05.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12058 on 2018-08-31 at 17:17:14","Made available in DSpace on 2018-09-04T20:33:50Z (GMT). No. of bitstreams: 2 FENG-THESIS-2018.pdf: 2272779 bytes, checksum: c956990dd536561340663b89a041e826 (MD5) LICENSE.txt: 4211 bytes, checksum: c81ec072a36afbb1eb49b199ba91005f (MD5) Previous issue date: 2018-03-09","Embargo set by: Seth Robbins for item 107203 Lift date: 2020-09-04T20:34:13Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 107203 Lift date: 2020-09-04T20:37:00Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","Embargo set by: Seth Robbins for item 107203 Lift date: 2020-09-04T20:42:08Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system","U of I Only Restriction Lifted for Item 107203 on 2020-09-05T09:15:17Z."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101120"],"dc:language":["en"],"dc:rights":["Copyright 2018 Christina Feng"],"dc:subject":["Spotted Turtle","Clemmys guttata","turtle","demography"],"dc:title":["Demography of the spotted turtle (clemmys guttata) in Illinois"],"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":"2026-07-22T22:24:38Z"}