A chemosynthetic weed: the tubeworm Sclerolinum contortum is a bipolar, cosmopolitan species.
A chemosynthetic weed: the tubeworm Sclerolinum contortum is a bipolar, cosmopolitan species.
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DOI：
10.1186/s12862-015-0559-y
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发表时间：
2015-12-14
影响因子：
3.4
通讯作者：
Glover AG
中科院分区：
文献类型：
--
作者：
Georgieva MN;Wiklund H;Bell JB;Eilertsen MH;Mills RA;Little CT;Glover AG
核壳菌（环节动物：Siboglinidae）是一种小型的，丝状的深海管虫，依靠与化学合成细菌的内共生来获得营养，以其在多种还原环境中定居的能力而闻名。自2000年代初以来，已知有一种硬壳藻种群栖息在南大洋布兰斯菲尔德海峡的沉积物热液喷口中，虽然没有被描述，但有人认为它在这个生态系统中发挥着重要的生态作用。在这里，我们表明，南大洋Sclerolinum种群不是一个新种，但更值得注意的是，实际上属于物种S。扭曲的，第一次被描述是在16,000公里外的北极泥火山。我们的新数据与现有的遗传研究相结合，扩大了该物种在极地海洋和墨西哥湾的范围。我们的分析表明，该物种的种群结构在区域范围内，更大的遗传分化发生在种群之间，而不是种群内。对S.通过共聚焦和扫描电子显微镜成像揭示了扭转，并讨论了该蠕虫的生态学。这些结果进一步揭示了这种siboglinid组的可塑性和适应性的范围内减少的条件，并进入同一物种的种群之间发生在全球范围内的基因流的水平。本文的在线版本（doi：10.1186/s12862-015-0559-y）包含补充材料，可供授权用户使用。
Sclerolinum (Annelida: Siboglinidae) is a genus of small, wiry deep-sea tubeworms that depend on an endosymbiosis with chemosynthetic bacteria for their nutrition, notable for their ability to colonise a multitude of reducing environments. Since the early 2000s, a Sclerolinum population has been known to inhabit sediment-hosted hydrothermal vents within the Bransfield Strait, Southern Ocean, and whilst remaining undescribed, it has been suggested to play an important ecological role in this ecosystem. Here, we show that the Southern Ocean Sclerolinum population is not a new species, but more remarkably in fact belongs to the species S. contortum, first described from an Arctic mud volcano located nearly 16,000 km away. Our new data coupled with existing genetic studies extend the range of this species across both polar oceans and the Gulf of Mexico. Our analyses show that the populations of this species are structured on a regional scale, with greater genetic differentiation occurring between rather than within populations. Further details of the external morphology and tube structure of S. contortum are revealed through confocal and SEM imaging, and the ecology of this worm is discussed. These results shed further insight into the plasticity and adaptability of this siboglinid group to a range of reducing conditions, and into the levels of gene flow that occur between populations of the same species over a global extent. The online version of this article (doi:10.1186/s12862-015-0559-y) contains supplementary material, which is available to authorized users.