Lin Long-Hui, Zhu Xia-Ming, Du Yu, Fang Meng-Chao, Ji Xiang
Hangzhou Key Laboratory for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, Zhejiang, China.
Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu, China.
Curr Zool. 2019 Feb;65(1):1-9. doi: 10.1093/cz/zoy026. Epub 2018 Apr 6.
We obtained geo-referenced occurrence and climatic data from individual localities for 59 species of terrestrial elapid snakes, used phylogenetic generalized least squares regression to investigate spatial and cladistic patterns of variation in climatic niche breadths, and compared patterns within and across regions and clades to see if they parallel or differ from each other. Specifically, we test (1) whether a species' climatic niche breadth on a given niche axis relates to its position along that axis, and to its climatic niche breadth on another niche axis, and (2) whether variation in niche breadths among species is explained by within-locality variation in climatic conditions or by among-locality variation. We found that: (1) there is an overall global pattern, and patterns in individual regions or clades generally parallel each other and global patterns; (2) species in warmer environments have narrower temperature niche breadths (TNBs); (3) precipitation niche breadth (PNB) and position are positively related; (4) TNB and PNB are not related; and (5) within-locality variation in climatic conditions explains most variation in TNBs, whereas among-locality variation explains most variation in PNBs. Our results are consistent with those reported for lizards of the families Phrynosomatidae and Varanidae, confirm the importance of within-locality niche breadth to species niche breadth, and show a more important role of among-locality niche breadth in affecting species niche breadth in terrestrial elapids than in lizards.
我们从各个地点获取了59种陆生眼镜蛇的地理参考分布数据和气候数据，采用系统发育广义最小二乘法回归来研究气候生态位宽度变化的空间和系统发育模式，并比较不同区域和类群内部及之间的模式，以观察它们是否相互平行或存在差异。具体而言，我们检验：（1）一个物种在给定生态位轴上的气候生态位宽度是否与其在该轴上的位置以及在另一个生态位轴上的气候生态位宽度相关；（2）物种间生态位宽度的变化是由当地气候条件的变化还是由不同地点间的变化所解释。我们发现：（1）存在一个总体的全球模式，各个区域或类群的模式通常相互平行且与全球模式一致；（2）生活在较温暖环境中的物种具有较窄的温度生态位宽度（TNBs）；（3）降水生态位宽度（PNB）与位置呈正相关；（4）TNB与PNB不相关；（5）当地气候条件的变化解释了TNBs的大部分变化，而不同地点间的变化解释了PNB的大部分变化。我们的结果与针对角蜥科和巨蜥科蜥蜴所报道的结果一致，证实了当地生态位宽度对物种生态位宽度的重要性，并表明在影响陆生眼镜蛇的物种生态位宽度方面，不同地点间的生态位宽度比在蜥蜴中发挥着更重要的作用。
