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Going deeper into the molecular ecology of the Southwest Atlantic Caretta caretta (Testudinata: Cheloniidae), what do microsatellites reveal to us?
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Going deeper into the molecular ecology of the Southwest Atlantic Caretta caretta (Testudinata: Cheloniidae), what do microsatellites reveal to us?
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Journal Article
Going deeper into the molecular ecology of the Southwest Atlantic Caretta caretta (Testudinata: Cheloniidae), what do microsatellites reveal to us?
2023
Overview
The loggerhead sea turtle (Caretta caretta) is a cosmopolitan sea turtle species and is listed by IUCN as Vulnerable globally. The Southwest Atlantic is an important regional management unit of C. caretta worldwide due to the distinctive mitochondrial DNA (mtDNA) lineage promoted by recent radiation within the Atlantic-Mediterranean region. However, due to the low resolution of mtDNA, the population structure of C. caretta SWA has not been well understood in the previous studies using only mtDNA. Our study encloses data from literature and a long-term genetic survey (1999 to 2021) distributed through four great nesting areas for the Southwest Atlantic to assess the genetic diversity and the population structure of the C. caretta, using both mtDNA and 15 microsatellite loci. The results demonstrate that the genetic diversity indexes of the Southwest Atlantic C. caretta reflect distinct compositions at a population level due to variation at an individual level. The SSRs results identified well-established and significant spatial population structure between nesting areas. Unique genetic patterns were identified for those females from studied areas of the Southwest Atlantic, and it may be related to their philopatric behavior and high relatedness. Thus, this study deeply evaluated the molecular ecology of Southwest Atlantic C. caretta and provides, for the first time, a fine-scale and long-term resolution of the genetic diversity and population structure due to the use of microsatellite data that must be considered for further studies.
Publisher
Springer Nature B.V
