Conservation of turtles is complicated by their sensitivity to habitat degradation and overexploitation. I used microsatellites and standard population genetic analyses to explore genetic diversity, population structure, paternity and demographic history in two emydid turtles that are currently experiencing threats to their survival. The Blanding’s turtle, Emydoidea blandingii, has experienced habitat fragmentation throughout its range, and this study focuses on a population in Massachusetts where hatchlings from one population are being translocated to establish a new population. I found evidence of multiple paternity within clutches and found no significant reduction in genetic diversity when comparing the source population and the offspring being relocated. Genetic structuring of populations of Diamondback terrapins (Malaclemys terrapin) has only been detected at the range wide level. However, previous studies failed to obtain abundant samples covering a large spatial scale. I acquired a collection of 556 terrapin tissue samples from across Louisiana where landscape features include two large freshwater rivers expected to act as a barrier to gene flow. I found a highly connected population with no indication of discrete genetic structuring across the major freshwater rivers in Louisiana. Additionally, I found evidence of a stepping stone migration model, isolation by distance and historical bottlenecks.
","abstract_html":"<p>Conservation of turtles is complicated by their sensitivity to habitat degradation and overexploitation. I used microsatellites and standard population genetic analyses to explore genetic diversity, population structure, paternity and demographic history in two emydid turtles that are currently experiencing threats to their survival. The Blanding’s turtle, <em>Emydoidea blandingii</em>, has experienced habitat fragmentation throughout its range, and this study focuses on a population in Massachusetts where hatchlings from one population are being translocated to establish a new population. I found evidence of multiple paternity within clutches and found no significant reduction in genetic diversity when comparing the source population and the offspring being relocated. Genetic structuring of populations of Diamondback terrapins (<em>Malaclemys terrapin</em>) has only been detected at the range wide level. However, previous studies failed to obtain abundant samples covering a large spatial scale. I acquired a collection of 556 terrapin tissue samples from across Louisiana where landscape features include two large freshwater rivers expected to act as a barrier to gene flow. I found a highly connected population with no indication of discrete genetic structuring across the major freshwater rivers in Louisiana. Additionally, I found evidence of a stepping stone migration model, isolation by distance and historical bottlenecks.</p>","abstract_has_math":false,"creators":["Petre, Charlotte Lizana"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Masters Thesis","degree_discipline":"Biological Sciences","degree_department":null,"school":null,"contributors":["Brian Kreiser","Carl Qualls","Jake Schaefer"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-01T08:00:00Z","date_published":"2014-12-01T08:00:00Z","updated_at":"2026-07-24T05:44:27Z","subjects":["conservation genetics","diamondback terrapin","Blanding's turtle","landscape genetics","paternity","Biology","Genetics","Population Biology"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://aquila.usm.edu/masters_theses/64","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Brian Kreiser","Carl Qualls","Jake Schaefer"]},{"key":"dc:creator","label":"Author","values":["Petre, Charlotte Lizana"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2014-01-01T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biological Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["conservation genetics","diamondback terrapin","Blanding's turtle","landscape genetics","paternity","Biology","Genetics","Population Biology"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://aquila.usm.edu/masters_theses/64"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Conservation of turtles is complicated by their sensitivity to habitat degradation and overexploitation. I used microsatellites and standard population genetic analyses to explore genetic diversity, population structure, paternity and demographic history in two emydid turtles that are currently experiencing threats to their survival. The Blanding’s turtle, Emydoidea blandingii, has experienced habitat fragmentation throughout its range, and this study focuses on a population in Massachusetts where hatchlings from one population are being translocated to establish a new population. I found evidence of multiple paternity within clutches and found no significant reduction in genetic diversity when comparing the source population and the offspring being relocated. Genetic structuring of populations of Diamondback terrapins (Malaclemys terrapin) has only been detected at the range wide level. However, previous studies failed to obtain abundant samples covering a large spatial scale. I acquired a collection of 556 terrapin tissue samples from across Louisiana where landscape features include two large freshwater rivers expected to act as a barrier to gene flow. I found a highly connected population with no indication of discrete genetic structuring across the major freshwater rivers in Louisiana. Additionally, I found evidence of a stepping stone migration model, isolation by distance and historical bottlenecks.
"]},{"key":"dc:title","label":"Title","values":["The Conservation Genetics of Two Emydid Turtles: Emydoidea blandingii and Malaclemys terrapin"]}]}],"canonical_facts":{"dc:contributor":["Brian Kreiser","Carl Qualls","Jake Schaefer"],"dc:creator":["Petre, Charlotte Lizana"],"dc:date.available":["2014-01-01T08:00:00Z"],"dc:description.abstract":["Conservation of turtles is complicated by their sensitivity to habitat degradation and overexploitation. I used microsatellites and standard population genetic analyses to explore genetic diversity, population structure, paternity and demographic history in two emydid turtles that are currently experiencing threats to their survival. The Blanding’s turtle, Emydoidea blandingii, has experienced habitat fragmentation throughout its range, and this study focuses on a population in Massachusetts where hatchlings from one population are being translocated to establish a new population. I found evidence of multiple paternity within clutches and found no significant reduction in genetic diversity when comparing the source population and the offspring being relocated. Genetic structuring of populations of Diamondback terrapins (Malaclemys terrapin) has only been detected at the range wide level. However, previous studies failed to obtain abundant samples covering a large spatial scale. I acquired a collection of 556 terrapin tissue samples from across Louisiana where landscape features include two large freshwater rivers expected to act as a barrier to gene flow. I found a highly connected population with no indication of discrete genetic structuring across the major freshwater rivers in Louisiana. Additionally, I found evidence of a stepping stone migration model, isolation by distance and historical bottlenecks.
"],"dc:identifier":["https://aquila.usm.edu/masters_theses/64"],"dc:subject":["conservation genetics","diamondback terrapin","Blanding's turtle","landscape genetics","paternity","Biology","Genetics","Population Biology"],"dc:title":["The Conservation Genetics of Two Emydid Turtles: Emydoidea blandingii and Malaclemys terrapin"],"thesis:degree_discipline":["Biological Sciences"],"thesis:degree_level":["Masters Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T05:44:27Z"}