Abstract Siphonophores have a widespread distribution in the world oceans, can be very abundant in some areas, and can have a significant impact on other pelagic animals. In this work, siphonophores from the Atlantic sector of the Southern Ocean were studied. Zooplankton organisms were collected at 35 stations in December 2009. Thirty different species were found: 2 physonects and 28 calycophorans. Total abundances of siphonophores varied with latitude; maximum numbers were observed in the northern part of the transect, in the vicinity of South Africa, where Muggiaea atlantica was the dominant species. To the south, the contribution of Eudoxoides spiralis and Lensia subtilis increased. In the whole investigated region, the most numerous siphonophore was Dimophyes arctica. Based on our results, it can be assumed that in the Atlantic sector of the Southern Ocean probably exist two Siphonophora biodiversity spots, probably exist in the Benguela Current region and the Subtropical Convergence region. Moreover, our results show that the Southern Subtropical Convergence seems to be a very strong biogeographical barrier for many tropical and temperate Siphonophora species.

中文翻译：

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南大洋大西洋部分远洋虹吸虫（刺胞动物）的带状变异

摘要 虹吸管在世界海洋中广泛分布，在某些地区非常丰富，对其他中上层动物有显着影响。在这项工作中，研究了来自南大洋大西洋部分的虹吸管。2009 年 12 月在 35 个站点收集了浮游动物生物。发现了 30 种不同的物种：2 种浮游动物和 28 种花萼。虹吸管总丰度随纬度变化；在横断面的北部，在南非附近观察到最大数量，那里的 Muggiaea atlantica 是优势物种。在南部，Eudoxoides spinis 和 Lensia subtilis 的贡献增加。在整个调查区，数量最多的虹吸虫是Dimophyes arctica。根据我们的结果，可以假设在南大洋的大西洋部分可能存在两个虹吸虫生物多样性点，可能存在于本格拉海流区和亚热带辐合区。此外，我们的结果表明，南亚热带辐合似乎是许多热带和温带虹吸虫物种的非常强大的生物地理障碍。