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首页> 外文期刊>Polar biology >Mega-epibenthos at Bouvet Island (South Atlantic): a spatially isolated biodiversity hot spot on a tiny geological spot
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Mega-epibenthos at Bouvet Island (South Atlantic): a spatially isolated biodiversity hot spot on a tiny geological spot

机译：布韦特岛（南大西洋）的巨型表观动物：在一个微小的地质点上，一个空间隔离的生物多样性热点

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摘要

Mega-epibenthic diversity was analysed using a seabed photography at four stations off Bouvet Island and one station at the Spiess Seamount in the South Atlantic. Surprisingly, the intermediate-scale diversity within the area of investigation was not lower compared to that on the Patagonian shelf and only moderately lower than that on the Antarctic continental shelf. This result is incompatible with Mac Arthur and Wilson's Island Biogeography Theory describing species richness as a function of immigration of new species into an area and its extension. The relatively high species number and the very small extension of the Bouvet shelf compared to the much larger continental shelves of the other two areas can be explained by long-range dispersal of marine benthic animals in the Antarctic Circumpolar Current and high habitat heterogeneity. The observed uncoupling of intermediate-scale from large-scale background species diversity on the Antarctic shelf raises the question whether in these benthic systems an upper capacity limit for diversity exists.
机译：在布韦特岛附近的四个站点和南大西洋的斯皮斯海山的一个站点使用海底摄影技术分析了上表皮动物的多样性。令人惊讶的是，调查区域内的中尺度多样性并不比巴塔哥尼亚大陆架低，而仅比南极大陆架低。这一结果与麦克阿瑟和威尔逊的岛屿生物地理学理论不符，后者描述了物种丰富度与新物种向该地区迁移及其扩展的功能。与其他两个地区更大的大陆架相比，布维架的物种数量相对较高，并且扩展范围很小，这可以通过南极极地洋流中底栖动物的远距离散布和高栖息地异质性来解释。在南极大陆架上观察到的中尺度与大型背景物种多样性的解耦提出了一个问题，即在这些底栖系统中是否存在多样性的上限。

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