Multiple haplotypes of Chelonia mydas juveniles in a threatened hotspot area in Southern Brazil

Savada, Camila Satie; Prosdocimi, Laura; Domit, Camila; Almeida, Fernanda Simões de

doi:10.1590/1678-4685-gmb-2020-0410

Cited by 3 publications

(7 citation statements)

References 44 publications

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“…This research filled an important regional gap by genetically characterizing the juvenile green turtles foraging in Uruguay, revealing connections to wide-spread nesting areas and regional feeding grounds, and emphasizing the importance of conserving this unique mixed stock. The study results complemented those of Brazil and Argentina (Bjorndal et al, 2006;Naro-Maciel et al, 2007;Jordão et al, 2015;Coelho et al, 2018;Torezani et al, 2010;Proietti et al, 2012;Prosdocimi et al, 2012;Savada et al, 2021). The absence of notable temporal or spatial genetic patterns within Uruguayan waters indicates that turtles disperse widely along this coastline and to and from neighboring areas such as southern Brazil and Argentina.…”

Section: Discussionsupporting

confidence: 79%

“…Further, the rarer CM-A42.1, CM-A44.1, and CM-A45.1 subhaplotypes link Uruguay to Ascension Island and/or African nesting and feeding areas (GenBank JF308473, JF308481; Patrıćio et al, 2017 respectively; Supplementary Table S3). Similar connections between South Atlantic foraging groups in Brazil and Argentina and rookeries of Ascension Island, Trindade Island (Brazil), and West Africa have been previously reported from genetic and mark-recapture studies (Naro-Maciel et al, 2007;Torezani et al, 2010;Proietti et al, 2012;Prosdocimi et al, 2012;Jordão et al, 2015;Coelho et al, 2018;Savada et al, 2021).…”

Section: Natal Origins Of Turtles Foraging In Uruguaysupporting

confidence: 79%

“…As no significant differences were found (see Results for details), these data were pooled into one single Uruguay sample for subsequent analyses. The sequence data were also included in a broader analysis of western Atlantic feeding grounds studied to date (Savada et al, 2021).…”

Section: Genetic Diversity and Differentiationmentioning

confidence: 99%

“…Contributions of nesting colonies to the Uruguayan feeding grounds (UY) were assessed through Mixed Stock Analysis (MSA) using Bayesian methods implemented in the program BAYES (Pella and Masuda, 2001). The 16 previously described Atlantic or Mediterranean nesting colonies were explored as sources in the MSA (Figure 1; Supplementary Table S1; Savada et al, 2021). The BAYES program integrates information from the observed data (nesting colonies and feeding grounds) and is not biased by small sample size or rare haplotypes (Pella and Masuda, 2001).…”

Section: Natal Origins Of Turtles Foraging In Uruguaymentioning

confidence: 99%

“…The study feeding ground in Uruguay (UY) is symbolized by a star. Other western Atlantic feeding grounds (indicated by circles) and nesting colonies considered possible sources of turtles feeding in Uruguay (indicated by triangles), with References, are as follows: Bahamas (BH; Lahanas et al, 1998, Bolker et al, 2007Bass and Witzell, 2000;Bagley, 2003;Foley et al, 2007;Naro-Maciel et al, 2017), North Carolina (NC; Bass, 2006), Barbados (BB; Luke et al, 2004), Nicaragua (N; Bass et al, 1998), Cabo Verde (CV; Monzón-Argüello et al, 2010), Almofala (AL;Naro-Maciel et al, 2007), Atol das Rocas and Fernando de Noronha (FN; Bjorndal et al, 2006;Naro-Maciel et al, 2012), Bahia (BAH;Naro-Maciel et al, 2012), Rio de Janeiro (RJ; Jordão et al, 2015), Espıŕito Santo (ESP; Torezani et al, 2010;Naro-Maciel et al, 2012) Ubatuba (UB; Naro-Maciel et al, 2007), Paranaguá(PEC; Jordão et al, 2015;Coelho et al, 2018;Savada et al, 2021), Arvoredo (ARV; Proietti et al, 2012), Casino (CB; Proietti et al, 2012), and Argentina (AR; Prosdocimi et al, 2012). Nesting areas from Encalada et al (1996) and others include Rocas Atoll (Bjorndal et al, 2006), Aves Island, Venezuela (AV), Matapica, Suriname (SU; Jordão et al, 2015), Quintana Roo, México (MX), Lara Bay, Cyprus (MED; Kaska, 2000), Florida (FL; Encalada et al, 1996;Bass and Witzell, 2000;Shamblin et al, 2014), Tortuguero, Costa Rica (CR;Bjorndal et al, 2005), Ascension Island, UK (AI), and Poilaõ, Guinea Bissau (GB; Formia et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Genetic composition of green sea turtles (Chelonia mydas) at coastal feeding areas of Uruguay

Prosdocimi,

Vilaca,

Naro-Maciel

et al. 2024

Front. Amphib. Reptile Sci.

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The highly migratory and marine nature of species such as green sea turtles (Chelonia mydas) may hinder understanding of basic life history and impact ensuing management and conservation applications across their full range. To elucidate the linkages between juvenile green turtles foraging in coastal waters of Uruguay in the Southwestern Atlantic Ocean to their future nesting or feeding grounds, this study investigated their genetic composition . A total of 201 tissue samples were collected from turtles that had stranded or were intentionally captured for scientific research along the Uruguayan coast (ca. 33°–35°S) during two sampling periods (2003–2005 and 2009–2014). Samples were pooled for analysis. Twelve mitochondrial control region haplotypes and ten subhaplotypes were identified, all of which had been previously detected at Atlantic or Caribbean nesting beaches. Mixed Stock Analysis revealed that most turtles traced to the Ascension Island rookery, representing a substantial connection to the remote mid-Atlantic island thousands of kilometers distant. Other nesting areas, such as Guinea Bissau in Africa and Trindade Island in Brazil, represented less significant sources. There was no significant temporal or spatial genetic structure within Uruguayan waters, suggesting dispersion along this coast. Despite the geographic distance from the nesting beach, the significant connection to the Ascension Island rookery underscores the importance of considering rookery population size and ocean current influences in understanding source contributions. These findings emphasize the need for conservation efforts, including the maintenance of existing protected areas and the creation of new ones, to ensure the long-term conservation of green turtles connected to various nesting colonies and feeding grounds.

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Section: Discussionsupporting

confidence: 79%

Section: Natal Origins Of Turtles Foraging In Uruguaysupporting

confidence: 79%

Section: Genetic Diversity and Differentiationmentioning

confidence: 99%

Section: Natal Origins Of Turtles Foraging In Uruguaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic composition of green sea turtles (Chelonia mydas) at coastal feeding areas of Uruguay

Prosdocimi,

Vilaca,

Naro-Maciel

et al. 2024

Front. Amphib. Reptile Sci.

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Atlantic connectivity of a major green sea turtle Chelonia mydas foraging aggregation at the Banc d’Arguin, Mauritania

Patrício,

Coveney,

Barbanti

et al. 2024

Endang. Species. Res.

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Understanding population connectivity is paramount for effective conservation. While genetic tools have elucidated sea turtle migration patterns, notable data gaps limit our understanding of ocean-wide connectivity, especially regarding east Atlantic green turtles. We characterized the genetic composition of a globally important green turtle foraging aggregation at the Banc d’Arguin, Mauritania, incorporating data from 323 individuals captured between 2018 and 2021. Using extended mitochondrial DNA D-loop (738 base pairs [bp]) and mitochondrial short tandem repeat (mtSTR; ~200 bp) markers, we assessed the genetic structure of Atlantic green turtle foraging aggregations and estimated the most likely origin of immature green turtles from the Banc d’Arguin using mixed stock analyses (MSAs). We identified 6 D-loop haplotypes, with a clear dominance of CM-A8.1 (91.8%) followed by CM-A5.1 (6.3%) and 4 rare haplotypes: CM-A1.4, CMA6.1, CM24.1 and CM36.1. We found 13 mtSTR haplotypes, with ‘7-12-4-4’ being dominant (89.0%). The genetic composition at the Banc d’Arguin differed significantly from the only foraging aggregation studied in West Africa to date—in the archipelago of Cabo Verde (located ca. 750 km from the Banc d’Arguin)—dominated by haplotype CM-A5. The MSA combining both genetic markers indicated that 87.6% of immature green turtles at the Banc d’Arguin originate from the major East Atlantic rookery at Poilão (Guinea-Bissau), but 11.6% come from more distant rookeries in South America (8.1%) and potentially Ascension Island (3.4%). We suggest that green turtle transatlantic movements may be more common than previously thought and highlight the importance of the Banc d’Arguin as a regional foraging hub for this species.

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Diet composition of juvenile green turtles in the Southwestern Atlantic Ocean: long-term insights from a beach stranding program

Gama,

Seminoff,

Lemons

et al. 2024

Mar. Ecol. Prog. Ser.

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Long-term diet studies provide information on the temporal variation in diet composition, habitat use, and foraging ecology of species. Assessment of dead-stranded sea turtles by stranding programs allows systematic diet sampling over a broad temporal scale, which can help elucidate potential ecological and environmental changes. Off the Southwestern Atlantic Ocean, the coast of Paraná, Brazil, is an important foraging ground for juvenile green turtles Chelonia mydas. To determine seasonal and interannual diet variability, we analyzed the dietary contents of 351 dead-stranded individuals to the major taxa level from 2008 to 2020. We identified 13 major prey groups that made up green turtles’ diets. A subset of turtles had diet identified to the lowest taxonomic level possible. Interannual differences were found, with the chlorophyte Ulva lactuca highly important in 2008 and 2011-2018, and Bivalvia and Gastropoda in 2016 and 2017. During La Niña events (2011, 2012, 2013, 2014, 2017, 2018, 2020), Chlorophyta, Mollusca, Crustacea, and Hydrozoa were the most frequently encountered diet items; during El Niño events (2015, 2016, 2019), Ochrophyta was the most consumed taxon. Seasonal differences were found, such that Echinodermata and Teleostei were important in autumn and winter, and Hydrozoa and Gastropoda in all seasons. Our results underscore individual dietary plasticity, including inter-seasonal and annual differences, which likely reflects the ability of green turtles to respond to changing prey availabilities and environmental characteristics driven by natural and perhaps anthropogenic influences. Understanding potential links between diet, habitat use, and the effects of a shifting diet and foraging grounds are key information for monitoring impacts and guiding conservation actions.

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Multiple haplotypes of Chelonia mydas juveniles in a threatened hotspot area in Southern Brazil

Cited by 3 publications

References 44 publications

Genetic composition of green sea turtles (Chelonia mydas) at coastal feeding areas of Uruguay

Genetic composition of green sea turtles (Chelonia mydas) at coastal feeding areas of Uruguay

Atlantic connectivity of a major green sea turtle Chelonia mydas foraging aggregation at the Banc d’Arguin, Mauritania

Diet composition of juvenile green turtles in the Southwestern Atlantic Ocean: long-term insights from a beach stranding program

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