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Climate constrains the evolutionary history and biodiversity of crocodylians.
Nature Communications ( IF 14.7 ) Pub Date : 2015-Sep-24 , DOI: 10.1038/ncomms9438 Philip D Mannion 1 , Roger B J Benson 2 , Matthew T Carrano 3 , Jonathan P Tennant 1 , Jack Judd 1 , Richard J Butler 4
Nature Communications ( IF 14.7 ) Pub Date : 2015-Sep-24 , DOI: 10.1038/ncomms9438 Philip D Mannion 1 , Roger B J Benson 2 , Matthew T Carrano 3 , Jonathan P Tennant 1 , Jack Judd 1 , Richard J Butler 4
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The fossil record of crocodylians and their relatives (pseudosuchians) reveals a rich evolutionary history, prompting questions about causes of long-term decline to their present-day low biodiversity. We analyse climatic drivers of subsampled pseudosuchian biodiversity over their 250 million year history, using a comprehensive new data set. Biodiversity and environmental changes correlate strongly, with long-term decline of terrestrial taxa driven by decreasing temperatures in northern temperate regions, and biodiversity decreases at lower latitudes matching patterns of increasing aridification. However, there is no relationship between temperature and biodiversity for marine pseudosuchians, with sea-level change and post-extinction opportunism demonstrated to be more important drivers. A 'modern-type' latitudinal biodiversity gradient might have existed throughout pseudosuchian history, and range expansion towards the poles occurred during warm intervals. Although their fossil record suggests that current global warming might promote long-term increases in crocodylian biodiversity and geographic range, the 'balancing forces' of anthropogenic environmental degradation complicate future predictions.
中文翻译：
气候限制了鳄鱼的进化历史和生物多样性。
鳄鱼及其近亲（假鳄类）的化石记录揭示了丰富的进化历史，引发了人们对长期下降到目前生物多样性低的原因的质疑。我们使用一个全面的新数据集分析了 2.5 亿年历史中二次抽样的假鳄类生物多样性的气候驱动因素。生物多样性和环境变化密切相关，北部温带地区气温下降导致陆地类群长期减少，低纬度地区生物多样性减少，与干旱化加剧的模式相匹配。然而，海洋假鳄类的温度和生物多样性之间没有关系，海平面变化和灭绝后的机会主义被证明是更重要的驱动因素。“现代型” 纬度生物多样性梯度可能在整个伪鳄的历史中都存在，并且在温暖的间隔期间发生了向两极的范围扩展。尽管他们的化石记录表明，当前的全球变暖可能会促进鳄鱼生物多样性和地理范围的长期增加，但人为环境退化的“平衡力”使未来的预测变得复杂。
更新日期：2015-09-27
中文翻译：
气候限制了鳄鱼的进化历史和生物多样性。
鳄鱼及其近亲（假鳄类）的化石记录揭示了丰富的进化历史，引发了人们对长期下降到目前生物多样性低的原因的质疑。我们使用一个全面的新数据集分析了 2.5 亿年历史中二次抽样的假鳄类生物多样性的气候驱动因素。生物多样性和环境变化密切相关，北部温带地区气温下降导致陆地类群长期减少，低纬度地区生物多样性减少，与干旱化加剧的模式相匹配。然而，海洋假鳄类的温度和生物多样性之间没有关系，海平面变化和灭绝后的机会主义被证明是更重要的驱动因素。“现代型” 纬度生物多样性梯度可能在整个伪鳄的历史中都存在，并且在温暖的间隔期间发生了向两极的范围扩展。尽管他们的化石记录表明，当前的全球变暖可能会促进鳄鱼生物多样性和地理范围的长期增加，但人为环境退化的“平衡力”使未来的预测变得复杂。
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