Diversity and distribution of Laonice species (Annelida: Spionidae) in the tropical North Atlantic and Puerto Rico Trench
Diversity and distribution of Laonice species (Annelida: Spionidae) in the tropical North Atlantic and Puerto Rico Trench
复制标题
热带北大西洋和波多黎各海沟的Laonice物种（Annelida：Spiionidae）的多样性和分布
作者：
Theresa Guggolz;K. Meißner;Martin Schwentner;A. Brandt
Laonice Malmgren，1867（环节动物门：Spionidae）是深海中常见的多毛类动物属。虽然对大多数物种的形态学进行了很好的研究，但取样期间发生的碎裂和其他损害往往妨碍深海标本的形态学物种鉴定。本研究采用16 S、COI和18 S三种分子标记对热带北大西洋和波多黎各海沟的Laonice的生物多样性和分布格局进行了研究。基于不同的分子分析（自动条形码缺口发现，成对遗传距离，单倍型网络），我们能够识别和区分八个Laonice物种。这些物种中有多达四种在同一个站点共域地发生。大多数物种在多个站点被发现，在大西洋东部和西部的两个物种的范围高达4，000公里。这些广泛的地理距离的遗传分化非常低。令人惊讶的是，一个16S单倍型在相距2，776公里的个体之间共享，来自加勒比海和东大西洋深海平原（> 3，389公里）的个体之间仅在16S中的单个突变中存在差异。我们的研究结果表明，该属的成员成功地分散在大的地理距离，在很大程度上不受地形障碍。
Laonice Malmgren, 1867 (Annelida: Spionidae) is a common polychaete genus in the deep-sea. Although most species are quite well studied morphologically, fragmentation and other damage that occurs during sampling often hampers morphological species identification of deep-sea specimens. In this study, we employ three molecular markers (16S, COI and 18S) to study the biodiversity and the distribution patterns of Laonice from the tropical North Atlantic and the Puerto Rico Trench. Based upon different molecular analyses (Automated Barcode Gap Discovery, pairwise genetic distances, phylogenetics, haplotype networks) we were able to identify and differentiate eight Laonice species. Up to four of these species co-occurred sympatrically at the same station. The majority of species were found at multiple stations and two species in the eastern as well as western Atlantic had ranges of up to 4,000 km. Genetic differentiation across these extensive geographic distances was very low. Surprisingly, one 16S haplotype was shared between individuals 2,776 km apart and individuals from the Caribbean and the abyssal plain in the eastern Atlantic (>3,389 km) differed in only a single mutation in 16S. Our results suggest that members of this genus successfully disperse across large geographic distances and are largely unaffected by topographic barriers.