Mutualist-mediated effects on species' range limits across large geographic scales
Mutualist-mediated effects on species' range limits across large geographic scales
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DOI：
10.1111/ele.12332
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发表时间：
2014-10-01
期刊：
影响因子：
8.8
通讯作者：
Strauss, Sharon Y.
中科院分区：
文献类型：
--
作者：
Afkhami, Michelle E.;McIntyre, Patrick J.;Strauss, Sharon Y.
了解决定物种范围限制的过程对于预测气候变化下的物种分布至关重要。预计的未来范围是根据基于气候层的分布模型推断出来的，很少有模型考虑生物相互作用对物种分布的影响。在这里，我们表明，积极的物种相互作用可以改善非生物胁迫，并对物种的活动范围限制产生深远的影响。结合对 92 个种群的实地调查、整个范围内的 10 个常见花园实验、物种分布模型和温室实验，我们表明，共生真菌内生菌可以改善干旱胁迫，并将其原生草宿主雀麦的地理范围扩大数千平方公里（大约大 20%），进入更干燥的栖息地。真菌相关草和无真菌草之间的范围差异与同源草的物种水平范围差异相当，表明对范围限制有很大影响。在确定物种范围和物种对大地理范围内未来气候的反应时，积极的生物相互作用可能被低估。
Understanding the processes determining species range limits is central to predicting species distributions under climate change. Projected future ranges are extrapolated from distribution models based on climate layers, and few models incorporate the effects of biotic interactions on species' distributions. Here, we show that a positive species interaction ameliorates abiotic stress, and has a profound effect on a species' range limits. Combining field surveys of 92 populations, 10 common garden experiments throughout the range, species distribution models and greenhouse experiments, we show that mutualistic fungal endophytes ameliorate drought stress and broaden the geographic range of their native grass host Bromus laevipes by thousands of square kilometres (similar to 20% larger) into drier habitats. Range differentiation between fungal-associated and fungal-free grasses was comparable to species-level range divergence of congeners, indicating large impacts on range limits. Positive biotic interactions may be underappreciated in determining species' ranges and species' responses to future climates across large geographic scales.