Intraspecific genetic variation is an integral component of diversification and the accumulation of biodiversity. The degree to which isolated populations of the same species are genetically structured in geographical space is impacted by a variety of mechanisms. In this study, I document patterns and discuss possible drivers of genetic structure within Ecpleopus gaudichaudii, a lizard species endemic to the Atlantic Forest of Brazil. For that, I assembled ddRadseq sequences from 48 individuals across much of the range of the E. gaudichaudii and analyzed its population structure. I created an intraspecific phylogeny for this group utilizing RAxML and conducted a principal component analysis to identify genomic clusters. Combining locality data and environmental descriptors, I also used species distribution models to generate a map of the species potential range, which guided my interpretation of the intraspecific patterns of genomic diversity. Together, the data identify a phylogenomic barrier at the Doce River, located in the state of Espírito Santo. This result agrees with a larger body of research indicating patterns of genetic divergence around this river in other taxa.
","abstract_html":"<p>Intraspecific genetic variation is an integral component of diversification and the accumulation of biodiversity. The degree to which isolated populations of the same species are genetically structured in geographical space is impacted by a variety of mechanisms. In this study, I document patterns and discuss possible drivers of genetic structure within <em>Ecpleopus gaudichaudii</em>, a lizard species endemic to the Atlantic Forest of Brazil. For that, I assembled ddRadseq sequences from 48 individuals across much of the range of the <em>E. gaudichaudii </em>and analyzed its population structure. I created an intraspecific phylogeny for this group utilizing RAxML and conducted a principal component analysis to identify genomic clusters. Combining locality data and environmental descriptors, I also used species distribution models to generate a map of the species potential range, which guided my interpretation of the intraspecific patterns of genomic diversity. Together, the data identify a phylogenomic barrier at the Doce River, located in the state of Espírito Santo. This result agrees with a larger body of research indicating patterns of genetic divergence around this river in other taxa.</p>","abstract_has_math":false,"creators":["Garretson, Alexander J"],"institution":null,"degree_name":"Master of Science (M.S.)","degree_level":"Thesis","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Ana Carnaval","Robert Anderson","David Lohman"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-01-01T08:00:00Z","date_published":"2022-01-01T08:00:00Z","updated_at":"2026-07-24T01:57:59Z","subjects":["Biodiversity","Bioinformatics","Evolution","Genomics","Other Ecology and Evolutionary Biology","Population Biology"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://academicworks.cuny.edu/cc_etds_theses/1088","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ana Carnaval","Robert Anderson","David Lohman"]},{"key":"dc:creator","label":"Author","values":["Garretson, Alexander J"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2023-12-07T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (M.S.)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biodiversity","Bioinformatics","Evolution","Genomics","Other Ecology and Evolutionary Biology","Population Biology"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://academicworks.cuny.edu/cc_etds_theses/1088"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Intraspecific genetic variation is an integral component of diversification and the accumulation of biodiversity. The degree to which isolated populations of the same species are genetically structured in geographical space is impacted by a variety of mechanisms. In this study, I document patterns and discuss possible drivers of genetic structure within Ecpleopus gaudichaudii, a lizard species endemic to the Atlantic Forest of Brazil. For that, I assembled ddRadseq sequences from 48 individuals across much of the range of the E. gaudichaudii and analyzed its population structure. I created an intraspecific phylogeny for this group utilizing RAxML and conducted a principal component analysis to identify genomic clusters. Combining locality data and environmental descriptors, I also used species distribution models to generate a map of the species potential range, which guided my interpretation of the intraspecific patterns of genomic diversity. Together, the data identify a phylogenomic barrier at the Doce River, located in the state of Espírito Santo. This result agrees with a larger body of research indicating patterns of genetic divergence around this river in other taxa.
"]},{"key":"dc:title","label":"Title","values":["Population structure of the lizard Ecpleopus gaudichaudii coincides with a biogeographic barrier - the Doce River"]}]}],"canonical_facts":{"dc:contributor":["Ana Carnaval","Robert Anderson","David Lohman"],"dc:creator":["Garretson, Alexander J"],"dc:date.available":["2023-12-07T08:00:00Z"],"dc:description.abstract":["Intraspecific genetic variation is an integral component of diversification and the accumulation of biodiversity. The degree to which isolated populations of the same species are genetically structured in geographical space is impacted by a variety of mechanisms. In this study, I document patterns and discuss possible drivers of genetic structure within Ecpleopus gaudichaudii, a lizard species endemic to the Atlantic Forest of Brazil. For that, I assembled ddRadseq sequences from 48 individuals across much of the range of the E. gaudichaudii and analyzed its population structure. I created an intraspecific phylogeny for this group utilizing RAxML and conducted a principal component analysis to identify genomic clusters. Combining locality data and environmental descriptors, I also used species distribution models to generate a map of the species potential range, which guided my interpretation of the intraspecific patterns of genomic diversity. Together, the data identify a phylogenomic barrier at the Doce River, located in the state of Espírito Santo. This result agrees with a larger body of research indicating patterns of genetic divergence around this river in other taxa.
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