Biodiversity and biogeography of hydroids across marine ecoregions and provinces of southern South America and Antarctica
Biodiversity and biogeography of hydroids across marine ecoregions and provinces of southern South America and Antarctica
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南美洲南部和南极洲海洋生态区和省份的水螅生物多样性和生物地理学
DOI：
10.1007/s00300-021-02909-1
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发表时间：
2021
期刊：
影响因子：
1.7
通讯作者：
A. C. Marques
中科院分区：
文献类型：
--
作者：
Thaís P. Miranda;M. O. Fernandez;G. Genzano;Á. L. P. Cantero;A. Collins;A. C. Marques
为了更好地了解南美洲南部和南极洲（SSA & A）之间的生物多样性，海洋地理学极地连接，我们使用底栖群落的水螅作为一个模型，通过评估经典的空间划分在不同的地理分辨率调查海洋组合。使用249个物种的地理参考数据集和多变量分析，我们调查了物种的分布，组成和地理连通性，并定义了该地区的生态区和省的组合。确定了面临枯竭危险的丰富生物多样性热点。对生态区的分析具有更分层的地理结构，并揭示了易受多样性丧失影响的关键区域。省的分析表明，南极-太平洋和舌状-亚南极组合之间有明显的划分，亚南极岛屿的地理隔离度很高。根据空间分辨率，麦哲伦地区的地理位置在空间上是矛盾的，集群一方面与SSA生态区，另一方面与南极省。我们的模式似乎是由不同的组合的过程和障碍，反映在水螅体的分层分布。麦哲伦地区和斯科舍弧分布边缘物种的高度特有性和集中性表明了它们的过渡性质，对于理解SSA和A之间的历史和生态联系特别重要。
To better understand the biodiversity-biogeographic polar connections between southern South America and Antarctica (SSA & A), we used benthic communities of hydroids as a model to investigate marine assemblages by evaluating classic spatial divisions at different geographical resolutions. Using a georeferenced dataset of 249 species and multivariate analyses, we investigated species’ distribution, composition and biogeographic connectivity, and defined assemblages of ecoregions and provinces for the area. Hotspots of rich biodiversity at risk of depletion were defined. Analyses of ecoregions have a more stratified biogeographic structure, and reveal critical regions susceptible to loss of diversity. Analyses of provinces show a clear division between Atlantic-Pacific and Antarctic-Subantartic assemblages, with high biogeographic isolation of the Subantarctic islands. Depending on spatial resolution, the biogeographic position of the Magellan area is spatially contradictory, clustering on the one hand with SSA ecoregions and on the other with Antarctic provinces. Our patterns appear to be driven by different combinations of processes and barriers, reflected in the stratified distribution of hydroids. The high level of endemism and concentration of species at the edge of distribution in the Magellan area and Scotia Arc suggest their transitional nature and particular importance for understanding the historical and ecological connections between SSA & A.