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

Anastácio, Rita; Pereira, Mário Jorge

doi:10.4236/nr.2017.88034

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…On the other hand, evidence of connectivity between haplotypes from green turtle rookeries in Mozambique (Anastácio et al, 2014 ), which fall within Atlantic clade II (Figure 3 , Figure A2 ), previously seen with short fragments (Bourjea et al, 2007 ), provides evidence of Atlantic to Indo‐Pacific movement more recently. Additional trans‐basin juvenile dispersal is evident in loggerheads, with Atlantic haplotypes CcA‐1.1, CcA‐1.3, CcA‐1.4 recovered from juveniles in the Mediterranean (Clusa et al, 2014 ; Garofalo et al, 2013 ; Tolve et al, 2018 ) and hawksbills, with Atlantic orphan haplotypes EiA‐49, EiA‐70, EiA‐75, EiA‐82, and EiA‐87 closely related to sequences from Indo‐Pacific rookeries in Seychelles, Mozambique, and Chagos Archipelago (Anastácio & Pereira, 2017 ; Monzón‐Argüello et al, 2011 , 2010 ; Putman et al, 2014 ; Vargas et al, 2016 ; Vilaça et al, 2013 ; Figure A4 ).…”

Section: Discussionmentioning

confidence: 99%

Genetic variation among sea turtle life stages and species suggests connectivity among ocean basins

Phillips

Martin

Stahelin

et al. 2022

Ecology and Evolution

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Regional genetic differentiation of mitochondrial lineages occurs in migratory species with natal philopatry such as sea turtles. However, early juvenile dispersal represents a key opportunity for gene flow and colonization of new regions through founder events, making it an important yet under‐studied life stage. To assess connectivity among sea turtle life stages and ocean basins, we sequenced mitochondrial DNA (mtDNA) fragments from 35 juveniles sampled in the Gulf of Mexico from the rarely observed dispersal stage across three species: green turtles ( Chelonia mydas ; n = 30), hawksbills ( Eretmochelys imbricata ; n = 3), and loggerheads ( Caretta caretta ; n = 2). We estimated green turtle rookery contributions using a many‐to‐many Bayesian mixed stock analysis that incorporated dispersal probabilities based on rookery size and transport via ocean currents. We assembled a gene tree including 709 distinct mtDNA control region haplotypes from the literature for all seven extant sea turtle species to assess gaps in life‐stage data across ocean basins, as well as contextualize the lineages we sampled from dispersing juveniles. Our results indicate a high likelihood that green turtles sampled in the Gulf of Mexico originated from rookeries along the coast of Mexico, with smaller contributions from Costa Rica and Suriname. The gene tree analysis yielded species‐level relationships consistent with those presented previously, while intra‐species relationships between lineages and ocean basins differed, particularly within loggerhead and green turtle clades. Our results highlight the lack of genetic data from juvenile sea turtles, especially the early dispersal stage, and the potential for these data to answer broader questions of connectivity and diversification across species and lineages.

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Section: Discussionmentioning

confidence: 99%

Genetic variation among sea turtle life stages and species suggests connectivity among ocean basins

Phillips

Martin

Stahelin

et al. 2022

Ecology and Evolution

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Marine turtles of the African east coast: current knowledge and priorities for conservation and research

Geer

Bourjea

Broderick

et al. 2022

Endang. Species. Res.

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Although published literature regarding the 5 species of marine turtle found along the continental African east coast has grown substantially over the last decades, a comprehensive synthesis of their status and ecology is lacking. Using a mixed methods approach, which combined an exhaustive literature review and expert elicitation, we assessed the distribution and magnitude of nesting, foraging areas, connectivity, and anthropogenic threats for these species in Somalia, Kenya, Tanzania, Mozambique, and South Africa. A complex pattern of nesting sites, foraging areas, and migration pathways emerged that identified areas of high importance in all 5 countries, although significant data gaps remain, especially for Somalia. Illegal take, bycatch, and loss of foraging and nesting habitat were identified as the most serious anthropogenic threats. Although these threats are broadly similar along most of the coast, robust data that enable quantification of the impacts are scarce. Experts identified regional strengths and opportunities, as well as impediments to turtle conservation. Topics such as legislation and enforcement, collaboration, local stakeholders, and funding are discussed, and future directions suggested. Given the projected growth in human population along the continental African east coast and expected accompanying development, anthropogenic pressures on turtle populations are set to increase. Stronger regional collaboration and coordination within conservation and research efforts are needed if current and future challenges are to be tackled effectively.

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Intra-species variability in migratory movement of hawksbill turtles in the southwest Indian Ocean

Nivière,

Dalleau,

Bourjea

et al. 2024

Endang. Species. Res.

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Implementing effective conservation measures to manage migratory populations is challenging, especially in a relatively inaccessible dynamic environment such as the ocean. With limited financial and human resources, efforts must be intelligently prioritized to achieve conservation success and reduce uncertainties of conservation efforts. The southwest Indian Ocean (SWIO) hosts some of the world’s most important breeding grounds for the Critically Endangered hawksbill turtle Eretmochelys imbricata. However, knowledge gaps remain about the movement patterns of this species. Between 2007 and 2022, we deployed 17 satellite tags onto hawksbill turtles from scattered locations in the SWIO: 16 nesting females—Granitic Islands, Seychelles (n = 9); north Madagascar (n = 5); Moheli, Comoros (n = 1); Juan de Nova, Terres australes et antarctiques françaises (n = 1)—and 1 female bycaught in fisheries (east Madagascar). We found strong variability in migratory movements amongst individuals, particularly in terms of distance and movement persistence. Detailed analysis of movement persistence reveals that these individuals behave differently in neritic and oceanic habitats, with a lower movement persistence in neritic habitats. We identified a total of 12 foraging areas scattered throughout the SWIO, both in coastal and open-sea neritic habitats. These results reinforce the need to consider the importance of neritic habitats, for both migration and foraging, in conservation policies. The quantification of the degree of migratory variability is particularly important to developing conservation plans and strategies at both the national and international level, including the delineation of regional management units (RMUs) in the Indian Ocean.

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

Cited by 3 publications

References 32 publications

Genetic variation among sea turtle life stages and species suggests connectivity among ocean basins

Genetic variation among sea turtle life stages and species suggests connectivity among ocean basins

Marine turtles of the African east coast: current knowledge and priorities for conservation and research

Intra-species variability in migratory movement of hawksbill turtles in the southwest Indian Ocean

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