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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Genetic composition of green turtle feeding grounds in coastal waters of Argentina based on mitochondrial DNA
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Genetic composition of green turtle feeding grounds in coastal waters of Argentina based on mitochondrial DNA

机译：基于线粒体DNA的阿根廷沿海水域绿海龟饲养场的遗传组成

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摘要

The green turtle, Chelonia mydas, like other species of marine turtles, shows great migratory displacement be tween its nesting and feeding grounds. In an attempt to characterize the southernmost feeding grounds of this species, mtDNA sequence variation of green turtle aggregations in Argentinean waters was studied to elucidate genetic variation and infer possible origins. The goal of the present study is contemplated within the main purpose of the PRICTMA (Regional Program for Sea Turtle Research in Conservation of Argentina) and the Network ASO-Tortugas (Red Atlantico Sur Occidental-Tortugas) which are dedicated to promoting conservation studies in marine turtles in the region. A 486-bp fragment of the mitochondrial DNA control re gion was sequenced from 93 samples of incidentally caught juveniles from 2004 to 2007, revealing 9 haplo types. Nucleotide and haplotype diversity were similar to those detected in other Brazilian feeding grounds (Ubatuba and Atol das Rocas/Fernando de Noronha). Analysis of molecular variance (AMOVA) indicated sig nificant genetic differentiation among 9 western Atlantic feeding grounds for which data is currently avail able, suggesting variable contributions from different nesting colonies (F_(st)=0.29, P<10~(-4); Φ_(ST)=0.55, P<10~(-4)). Mitochondrial DNA haplotype distributions revealed significant heterogeneity among feeding grounds (X~2: 804.84, P<10~(-4)). A pairwise analysis revealed that most western Atlantic feeding grounds are genetically differentiated. The weighted and unweighted mixed stock analyses suggests that green turtles at Argentinean feeding grounds originate mainly in the Ascension Island rookery, with less contribution from rookeries in Suriname, Aves Island and Trindade Island. The present results improve our knowledge of the population structure and migration patterns of the Atlantic green turtle, and inform conservation measures on feeding grounds, which may be thousands of kilometers away from the nesting colonies. This information is required to further government efforts for this endan gered species.
机译：与其他种类的海龟一样，绿海龟（Chelonia mydas）在其筑巢和觅食地之间显示出极大的迁徙性。为了表征该物种最南端的觅食地，研究了阿根廷水域中绿海龟聚集体的mtDNA序列变异，以阐明遗传变异并推断可能的起源。在PRICTMA（阿根廷养护海龟研究区域计划）和ASO-Tortugas网络（Red Atlantico Sur Occidental-Tortugas）的主要目的下，致力于本研究的目标，该网络致力于促进海洋保护研究。该地区的海龟。从2004年至2007年的93个偶然捕获的未成年人样本中，对线粒体DNA调控区域的486 bp片段进行了测序，揭示了9个单倍型。核苷酸和单倍型多样性与在其他巴西饲养场（Ubatuba和Atol das Rocas / Fernando de Noronha）中检测到的相似。分子变异分析（AMOVA）表明，在目前可获得数据的西大西洋9个饲喂场之间，遗传分化显着，表明来自不同筑巢地的可变贡献（F_（st）= 0.29，P <10〜（-4）； Φ_（ST）= 0.55，P <10〜（-4））。线粒体DNA的单倍型分布显示出觅食地之间的显着异质性（X〜2：804.84，P <10〜（-4））。成对分析显示，大多数西大西洋觅食地在遗传上有所区别。加权和不加权混合种群分析表明，阿根廷饲养场的绿海龟主要起源于扬升岛群，而苏里南，埃夫斯岛和特林达德岛的群只占较小的比例。目前的结果提高了我们对大西洋绿海龟的种群结构和迁徙方式的了解，并为可能离巢殖民地数千公里的觅食场提供了保护措施。政府对这一濒危物种的进一步努力需要这些信息。

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