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首页> 外文期刊>Journal of marine science and technology >PHYLOGENETICALLY CLUMPED SPECIES COMPOSITION OF MARINE GREEN ALGAE (CHLOROPHYTA) IN THE TEMPERATE ZONE
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PHYLOGENETICALLY CLUMPED SPECIES COMPOSITION OF MARINE GREEN ALGAE (CHLOROPHYTA) IN THE TEMPERATE ZONE

机译：温带中海洋绿藻（叶绿藻）的系统发育聚集物种组成

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摘要

Global patterns of diversity in marine algae have been reported at the genus level but rarely at the species level. In this study, we investigate the global distribution of species diversity for marine green algae and evaluate the effect of water temperature upon the species composition. We calculated and mapped the species richness and phylogenetic diversity of green algae in 5 degrees x 5 degrees latitude -longitude cells. We then compared and grouped the different spatial patterns of phylogenetic species composition of green algae around the world. Finally, we fitted a locally weighted scatterplot smoothing (LOWESS) curve to the sea surface temperature (SST) data to determine how the species diversity varied with SST. We found hotspots of species richness and phylogenetic diversity in green algae in the seas around western Europe and the coasts of India, Brazil, South Africa, and northeastern Australia, and about half of these hotspots were located in the Atlantic Ocean. Both the species richness and the phylogenetic diversity of green algae were found to be higher in warm waters. In the tropics, the greater the species richness, the more the phylogenetic species composition was dispersed over multiple clusters. Conversely, in the temperate zone, the greater the species richness, the higher the phylogenetic clumpedness of the species in a community. The species in a community were evenly distributed on the phylogenetic tree in waters warmer than 23 degrees C. On the other hand, the phylogenetic species composition was clumped in waters cooler than 23 degrees C and this phylogenetic clumpedness increased as SST decreased. Our results indicate that the evolutionary processes of species composition in local communities of green algae have adapted to local environmental conditions, and suggest a phylogenetically clumped species composition of marine green algae in the temperate zones.
机译：在属水平上已经报告了海藻多样性的全球格局，但在物种水平上却很少。在这项研究中，我们调查了海洋绿藻物种多样性的全球分布，并评估了水温对物种组成的影响。我们计算并绘制了5度x 5度经纬度细胞中绿藻的物种丰富度和系统发育多样性。然后，我们对全球绿藻的系统发生种组成的不同空间格局进行了比较和分组。最后，我们对海表温度（SST）数据拟合了局部加权散点图平滑（LOWESS）曲线，以确定物种多样性如何随SST变化。我们在西欧以及印度，巴西，南非和澳大利亚东北海岸的海域的绿藻中发现了物种丰富和系统发育多样性的热点，这些热点中约有一半位于大西洋。在温暖的水域中，绿藻的物种丰富度和系统发育多样性均较高。在热带地区，物种丰富度越大，系统发育物种组成就越分散在多个簇上。相反，在温带地区，物种丰富度越大，群落中物种的系统发生结块性就越高。在高于23摄氏度的水域中，群落中的物种均匀地分布在系统树上。另一方面，在低于23摄氏度的水域中，系统发育物种组成结块，并且随着SST的降低，这种系统发育丛集增加。我们的结果表明，绿藻当地社区物种组成的进化过程已适应当地的环境条件，并表明在温带地区海洋绿藻的系统发生结块物种组成。

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