Green turtle genetics in the Gulf of Mexico, 2006-2019
Dates
Publication Date
2022-11-14
Start Date
2006
End Date
2019
Citation
Hart, K.M., Lamont, M.M., and Shamblin, B.M., 2022, Green turtle genetics in the Gulf of Mexico, 2006-2019: U.S. Geological Survey data release, https://doi.org/10.5066/P9H65DWH.
Summary
Mitochondrial DNA markers have elucidated patterns of connectivity between green turtle nesting populations (rookeries) and juveniles foraging in neritic nursery habitats. However, missing rookery baseline data and haplotype sharing among populations have often impeded inferences, including ascertaining origins of Gulf of Mexico juveniles. We sequenced the mitochondrial control region and additional informative mitogenomic single nucleotide polymorphisms of juveniles foraging in Port Fourchon, Louisiana (LA, n = 127) and Santa Rosa Island, Florida (SRI, n = 47). We collected additional genetic data for previously characterized neritic aggregations in southern Texas (TX, n = 167), St. Joseph Bay, Florida (SJB, n = 174) and southwestern [...]
Summary
Mitochondrial DNA markers have elucidated patterns of connectivity between green turtle nesting populations (rookeries) and juveniles foraging in neritic nursery habitats. However, missing rookery baseline data and haplotype sharing among populations have often impeded inferences, including ascertaining origins of Gulf of Mexico juveniles. We sequenced the mitochondrial control region and additional informative mitogenomic single nucleotide polymorphisms of juveniles foraging in Port Fourchon, Louisiana (LA, n = 127) and Santa Rosa Island, Florida (SRI, n = 47). We collected additional genetic data for previously characterized neritic aggregations in southern Texas (TX, n = 167), St. Joseph Bay, Florida (SJB, n = 174) and southwestern Florida (SWFL, n = 96). We assessed genetic structure among these sites, incorporating published data from a surface-pelagic (SP) aggregation offshore of Louisiana through Florida and a neritic aggregation from the Big Bend region of Florida (BB). We estimated source contributions to aggregations with new genetic data using a Bayesian many-to-one mixed stock analysis (MSA) approach. This data set contains passive induced transponder (PIT) tag number, sampling site information, capture date, control region (CR) haplotype, mitochondrial short tandem repeat (mtSTR) haplotype, and mitogenetic haplotype for each turtle.
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Related External Resources
Type: Related Primary Publication
Shamblin, B.M., Hart, K.M., Lamont, M.M., Shaver, D.J., Dutton, P.H., LaCasella, E.L., and Nairn, C.J., 2023, United States Gulf of Mexico waters provide important nursery habitat for Mexico’s green turtle nesting populations: Frontiers in Marine Science, v. 9, art. 1035834, https://doi.org/10.3389/fmars.2022.1035834.
We characterized genetic structuring among six neritic juvenile foraging aggregations spanning approximately 2,300 km of coastal habitats in the Gulf of Mexico. We sequenced new samples from two previously uncharacterized neritic juvenile foraging sites and re-sequenced samples from three additional aggregations. These data, along with published haplotype frequencies from a surface-pelagic aggregation offshore of Louisiana through the Florida panhandle and a neritic aggregation in the Big Bend region of Florida, provided a basis for assessing genetic structure across the region. We used Bayesian many-to-one mixed stock analyses to estimate rookery contributions to five aggregations incorporating novel genetic data and updated population baselines to: 1) qualitatively compare contribution estimates from MSA to published connectivity patterns based on passive oceanic transport, and 2) compare the published surface-pelagic sample with novel and updated data from proximal neritic aggregations, and 3) test for the presence of juveniles of Atlantic Florida origin in the Gulf of Mexico.
