Population origin and historical demography in hawksbill (Eretmochelys imbricata) feeding and nesting aggregates from Brazil

Vilaça, Sibelle Torres; Lara-Ruiz, Paula; Marcovaldi, Maria Ângela; Soares, Luciano S.; Santos, Fabrício R.

doi:10.1016/j.jembe.2013.06.004

Cited by 33 publications

(67 citation statements)

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“…Male sea turtles have uncertain philopatry and probably display greater flexibility in their choice of mating areas (FitzSimmons et al 1997). Similar patterns were found in previous studies using nDNA and are indicative of lack of male philopatry (FitzSimmons et al 1997; Bowen et al 2005; Carreras et al 2011; Vilaça et al 2013; Clusa et al 2018). Thus, the apparently discrepant results for mtDNA and multilocus data could be further explained by male-mediated gene flow between rookeries.…”

Section: Discussionsupporting

confidence: 89%

“…Unlike mtDNA, the nuclear loci isolated in this study showed that variation within both species is not significantly correlated to the geographic distribution along the Brazilian coast (Figure 3A and 3C, Supplementary Figure S1). Previous studies using mtDNA data showed significant differences in allelic frequencies between southern and northern Brazilian rookeries for C. caretta (Reis et al 2010a; Shamblin et al 2014) and E. imbricata (Vilaça et al 2013). For C. caretta , three genetically distinct clusters based on mtDNA were recognized along the Brazilian coast: northern coast (Bahia and Sergipe), Espírito Santo and Rio de Janeiro (Shamblin et al 2014).…”

Section: Discussionmentioning

confidence: 93%

“…Other genetic studies including Brazilian sea turtles have investigated their demographic history (Bjorndal et al 2006; Vargas et al 2008; Molfetti et al 2013), population structure (Reis et al 2010a; Vilaça et al 2013; Shamblin et al 2014; Arantes et al 2020), mixed stocks at foraging aggregations (Proietti et al 2009; Reis et al 2010a; Vilaça et al 2013; Proietti et al 2014b) and interspecific hybridization (Lara-Ruiz et al 2006; Reis et al 2010b; Vilaça et al 2012; Proietti et al 2014a; Soares et al 2017, 2018). For example, phylogeographic analyses using mtDNA showed significant genetic divergence among three Brazilian rookeries of C. caretta , suggesting the recognition of three different management units (Shamblin et al 2014), while two separate demographic units were recognized for E. imbricata in Brazilian nesting areas (Vilaça et al 2013). The mixed stocks found at foraging aggregations along the Brazilian coast demonstrated connectivity among distant ocean basins (Reis et al 2010a), which is highly influenced by oceanic currents (Vilaça et al 2013; Proietti et al 2014b).…”

Section: Introductionmentioning

confidence: 99%

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New genetic insights about hybridization and population structure of hawksbill and loggerhead turtles from Brazil

Arantes

Vilaça

Mazzoni

et al. 2020

Preprint

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19An extremely high incidence of hybridization among sea turtles is found along the 20 Brazilian coast. To understand this atypical phenomenon and its impact on sea turtle 21 conservation, research focused in the evolutionary history of sea turtles is fundamental. We 22 assessed high quality multilocus haplotypes of 143 samples of the five species of sea turtles 23 that occur along the Brazilian coast to investigate the hybridization process and the population 24 structure of hawksbill (Eretmochelys imbricata) and loggerhead turtles (Caretta caretta). The 25 multilocus data were initially used to characterize interspecific hybrids. Introgression (F2 26 hybrids) was only confirmed in hatchlings of F1 hybrid females (hawksbill x loggerhead), 27 indicating that introgression was either previously overestimated and F2 hybrids may not 28 survive to adulthood, or the first-generation hybrid females nesting in Brazil were born as recent 29 as few decades ago. Phylogenetic analyses using nuclear markers recovered the mtDNA-based 30 Indo-Pacific and Atlantic lineages for hawksbill turtles, demonstrating a deep genetic 31 divergence dating from the early Pliocene. In addition, loggerhead turtles that share a common 32 2 feeding area and belong to distinct Indo-Pacific and Atlantic mtDNA clades present no clear 33 genetic differentiation at the nuclear level. Finally, our results indicate that hawksbill and 34 loggerhead rookeries along the Brazilian coast are likely connected by male-mediated gene 35 flow. 36 37

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New genetic insights about hybridization and population structure of hawksbill and loggerhead turtles from Brazil

Arantes

Vilaça

Mazzoni

et al. 2020

Preprint

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“…mixed stock analysis (MSA) thus enables investigating the contribution of each source, that is, a nesting site, to a feeding ground, based on the significant differences of haplotype frequencies (Bolker, Okuyama, Bjorndal, & Bolten, ; Okuyama & Bolker, ). This technique has proved to be useful for multiple migratory vertebrates such as fishes (Bradbury et al, ; Dunton et al, ; Ruzzante, Taggart, Lang, & Cook, ), whales (Albertson‐Gibb et al, ; Schmitt et al, ), and sea turtles (Bowen et al, ; Jordao, Bondioli, Guebert, Thoisy, & Almeida‐Toledo, ; Naro‐Maciel et al, ; Proietti et al, ; Prosdocimi, Dutton, Albareda, & Remis, ; Prosdocimi, González Carman, Albareda, & Remis, ; Vilaça, Lara‐Ruiz, Marcovaldi, Soares, & Santos, ).…”

Section: Introductionmentioning

confidence: 99%

Connecting paths between juvenile and adult habitats in the Atlantic green turtle using genetics and satellite tracking

Chambault

Thoisy

Huguin

et al. 2018

Ecology and Evolution

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Although it is commonly assumed that female sea turtles always return to the beach they hatched, the pathways they use during the years preceding their first reproduction and their natal origins are most often unknown, as it is the case for juvenile green turtles found in Martinique waters in the Caribbean. Given the oceanic circulation of the Guiana current flowing toward Martinique and the presence of important nesting sites for this species in Suriname and French Guiana, we may assume that a large proportion of the juvenile green turtles found in Martinique are originating from the Suriname–French Guiana beaches. To confirm this hypothesis, we performed mixed stock analysis (MSA) on 40 green turtles sampled in Martinique Island and satellite tracked 31 juvenile green turtles tagged in Martinique to (a) assess their natal origin and (b) identify their destination. Our results from MSA confirm that these juveniles are descendant from females laying on several Caribbean and Atlantic beaches, mostly from Suriname and French Guiana, but also from more southern Brazilian beaches. These results were confirmed by the tracking data as the 10 turtles leaving Martinique headed across the Caribbean–Atlantic region in six different directions and 50% of these turtles reached the Brazilian foraging grounds used by the adult green turtles coming from French Guiana. One turtle left the French Guianan coast to perform the first transatlantic migration ever recorded in juvenile green turtles, swimming toward Guinea‐Bissau, which is the most important nesting site for green turtles along the African coast. The extensive movements of the migrant turtles evidenced the crossing of international waters and more than 25 exclusive economic zones, reinforcing the need for an international cooperative network to ensure the conservation of future breeders in this endangered species.

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“…past migrations and slow mutation rates, is more likely to explain the haplotype distribution [29] [31]. Like [17] emphasize, "because nesting aggregations in eastern Atlantic exhibit EATL haplotypes, the presence of this "typical" Indo-Pacific haplogroup in Atlantic areas does not necessarily mean that E. imbricata individuals are currently migrating among oceans". This discussion is used to explain the provenience of the São Tomé e Príncipe nesting and foraging hawksbill's populations [48], since the EATL haplotype is so abundant in these rookeries, whereas it is less abundant in other Atlantic locations revealing a strong past connection with the WIO.…”

Section: Connection Of the Wio With The Eastern Atlantic Haplotypesmentioning

confidence: 99%

A Piece of a Puzzle of Haplotypes for the Indian Ocean Hawksbill Turtle

Anastácio¹,

Pereira²

2017

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The Indian Ocean basin has much to reveal in what concerns marine turtles. Its regional management units (RMUs) are still lacking molecular data to define conservation strategies and priorities. Vamizi Island is one of the best known rookeries in the north of the Mozambique Channel. A mitochondrial DNA analysis revealed 14 haplotypes for the hawksbill turtle's nesting and foraging in/near Vamizi, twelve of which were new in 2011. Though more studies inside the Channel are needed, Vamizi Island possibly contributes with hatchlings for other locations. More knowledge is important to define priorities for management units inside the Indian Ocean.

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Population origin and historical demography in hawksbill (Eretmochelys imbricata) feeding and nesting aggregates from Brazil

Cited by 33 publications

References 50 publications

New genetic insights about hybridization and population structure of hawksbill and loggerhead turtles from Brazil

New genetic insights about hybridization and population structure of hawksbill and loggerhead turtles from Brazil

Connecting paths between juvenile and adult habitats in the Atlantic green turtle using genetics and satellite tracking

A Piece of a Puzzle of Haplotypes for the Indian Ocean Hawksbill Turtle

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