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The Antarctic Circumpolar Current as a dispersive agent in the Southern Ocean: evidence from bivalves

机译：南极环形电流作为南海中的分散剂：来自惯症的证据

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Over the past decades, several studies have revealed that the traditional view of the Antarctic Circumpolar Current (ACC) as an agent for species dispersal in the Southern Ocean is not applicable to all taxa. Some species are actually circum-Antarctically or circum-sub-Antarctically distributed, but some other species actually comprise species' complexes, with cryptic taxa occurring at different areas. However, to date, few of the invertebrate species formerly reported as widespread in the Southern Ocean have been re-analyzed using genetic techniques. This study examined whether two geographically distant areas of the sub-Antarctic region under the influence of the ACC, the Southern tip of South America (SSA) and the Prince Edward Islands (PEI), share some marine invertebrate species. For that, members of two genera of bivalves, Gaimardia and Hiatella, were selected. As part of this study, we found extremely low genetic differentiation between specimens from SSA and PEI. In addition, shared haplotypes were found between these two areas. Our results confirm that Gaimardia trapesina and one same species of Hiatella ("Hiatella O") are present in both areas. Given that these two species are found on macroalgae, natural rafts appear as the most plausible means of dispersal of juveniles and adults, although in the case of Hiatella O, additional larval dispersion cannot be discarded. In any of these cases, dispersion should be facilitated (or even determined) by the ACC. Thus, this study provides new evidence in favour of considering the ACC as an effective dispersive agent in the Southern Ocean.
机译：在过去的几十年中，一些研究表明，南部海洋中南海散席代理人的传统观点不适用于所有分类群。一些物种实际上是规章的或环状的或环形亚方形分布，但其他物种实际上包括物种复合物，在不同地区发生了隐秘的征集。然而，迄今为止，使用遗传技术已经重新分析了以前报告的南海普遍的无脊椎动物物种。本研究审查了在南美洲（SSA）和爱德华王子岛（PEI）的南方南部的亚南极地区的两个地理上遥远的地区，分享了一些海洋无脊椎动物。为此，选择了两种母语，Gaimardia和Hiatella的成员。作为本研究的一部分，我们发现来自SSA和PEI的标本之间的极低遗传分化。此外，在这两个区域之间发现了共享的单倍型。我们的结果证实，在这两个领域都存在Gaimardia Trapesina和一个相同的Hiatella（“Hiatella O”）。鉴于这两种物种在大型麦格胶上发现，天然筏表现为少年和成年人的分散的最合理的手段，尽管在Hiatella O的情况下，不能丢弃额外的幼虫分散。在任何这些情况下，应通过ACC促进分散（甚至甚至确定）。因此，本研究提供了新的证据，有利于将ACC视为南海的有效分散剂。

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  • 来源
    《Marine biology》 |2020年第10期|143.1-143.13|共13页
  • 作者

    Guller Marina; Puccinelli Eleonora; Zelaya Diego G.;

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    Univ Buenos Aires Fac Ciencias Exactas & Nat Dept Biodiversidad & Biol Expt Buenos Aires DF Argentina|Consejo Nacl Invest Cient & Tecn Buenos Aires DF Argentina;

    Univ Cape Town Marine Res Inst Dept Oceanog ZA-7701 Cape Town South Africa|Technopole Brest Iroise Lab Sci Environm Marin LEMAR UMR UBO 6539 Inst Univ Europeen Mer CNRS IRD IFREMER Rue Dumont Urville F-29280 Plouzane France;

    Univ Buenos Aires Fac Ciencias Exactas & Nat Dept Biodiversidad & Biol Expt Buenos Aires DF Argentina|Consejo Nacl Invest Cient & Tecn Buenos Aires DF Argentina;

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