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

IF 2.6 2区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION Endangered Species Research Pub Date : 2024-08-15 DOI:10.3354/esr01345
Ana Rita Patrício, Sophia A. Coveney, Anna Barbanti, Castro Barbosa, Annette C. Broderick, Nahi El’Bar, Brendan J. Godley, Joana M. Hancock, Aissa Regalla, Cheibani Senhoury, Ebaye Sidina, Benoît de Thoisy, Dominic Tilley, Sam Weber, Paulo Catry
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Abstract

ABSTRACT: 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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毛里塔尼亚阿尔金湾主要绿海龟觅食群的大西洋连通性
摘要:了解种群的连通性对于有效保护至关重要。虽然基因工具已经阐明了海龟的迁徙模式,但显著的数据缺口限制了我们对整个海洋连通性的了解,尤其是对东大西洋绿海龟的了解。我们结合 2018 年至 2021 年期间捕获的 323 只个体的数据,描述了毛里塔尼亚 Banc d'Arguin 一个具有全球重要意义的绿海龟觅食聚集地的遗传组成。利用扩展线粒体 DNA D-环(738 碱基对 [bp])和线粒体短串联重复(mtSTR;约 200 bp)标记,我们评估了大西洋绿海龟觅食聚集地的遗传结构,并利用混合种群分析(MSA)估计了来自 Banc d'Arguin 的未成熟绿海龟最可能的来源。我们确定了 6 个 D-环单倍型,其中 CM-A8.1 (91.8%)明显占优势,其次是 CM-A5.1(6.3%)和 4 个稀有单倍型:CM-A1.4、CMA6.1、CM24.1 和 CM36.1。我们发现了 13 个 mtSTR 单倍型,其中 "7-12-4-4 "为显性单倍型(89.0%)。阿金湾的遗传组成与迄今为止在西非研究的唯一一个觅食聚集地佛得角群岛(距阿金湾约 750 公里)的遗传组成有很大不同,该聚集地以单倍型 CM-A5 为主。结合这两种遗传标记的 MSA 表明,阿尔金湾 87.6% 的未成年绿海龟来自东大西洋的主要栖息地波良(几内亚比绍),但 11.6% 的绿海龟来自更远的南美洲栖息地(8.1%),也可能来自阿森松岛(3.4%)。我们认为,绿海龟跨大西洋活动可能比以前认为的更为普遍,并强调了阿金湾作为该物种区域觅食中心的重要性。
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来源期刊
Endangered Species Research
Endangered Species Research BIODIVERSITY CONSERVATION-
CiteScore
5.50
自引率
6.50%
发文量
38
审稿时长
31 weeks
期刊介绍: ESR is international and interdisciplinary. It covers all endangered forms of life on Earth, the threats faced by species and their habitats and the necessary steps that must be undertaken to ensure their conservation. ESR publishes high quality contributions reporting research on all species (and habitats) of conservation concern, whether they be classified as Near Threatened or Threatened (Endangered or Vulnerable) by the International Union for the Conservation of Nature and Natural Resources (IUCN) or highlighted as part of national or regional conservation strategies. Submissions on all aspects of conservation science are welcome.
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