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首页> 外文期刊>Trends in Ecology & Evolution >Bimodality of Latitudinal Gradients in Marine Species Richness
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Bimodality of Latitudinal Gradients in Marine Species Richness

机译:海洋物种丰富的纬度梯度的双极性

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摘要

The paradigm for the latitudinal gradient in species richness is that it is unimodal with a tropical peak. For 27 published studies, and global datasets of 65 000 recent and 50 000 fossil marine species, we found that almost all datasets were significantly bimodal with a dip in species richness near the equator. The locations of mid-latitude peaks varied between taxa and were higher in the northern hemisphere where the continental shelf is greatest. Our findings sup-port hypotheses of tropical species evolving in response to temperature variation near the edges of the tropics and available high-productivity habitat. They suggest that the equator may already be too hot for some species and that the modes may move further apart due to climate warming.
机译:物种丰富度的纬度梯度的范式是热带峰值是单峰。 对于27项公布的研究,以及最近和5万化石海洋物种的全球数据集,我们发现几乎所有数据集都是显着的双峰,在赤道附近的物种丰富度浸入。 中纬度峰的位置在分类群之间变化,北半球较高,大陆架最大。 我们的调查结果支持热带物种的假设,以响应热带边缘附近的温度变化和可用的高生产率栖息地。 他们建议赤道对于某些物种来说可能太热,并且由于气候变暖,模式可能会进一步移动。

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