Greater temperature sensitivity of plant phenology at colder sites: implications for convergence across northern latitudes
Greater temperature sensitivity of plant phenology at colder sites: implications for convergence across northern latitudes
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DOI：
10.1111/gcb.13619
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发表时间：
2017-07-01
影响因子：
11.6
通讯作者：
Rixen, Christian
中科院分区：
文献类型：
--
作者：
Prevey, Janet;Vellend, Mark;Rixen, Christian
气温升高加速了世界各地生物的物候。物候的温度敏感性可能更大，在较冷的，高纬度的网站比在温暖的地区，部分原因是温度的小变化构成较大的相对变化，在较冷的网站热平衡。为了验证这一假设，我们研究了长达20年的物候数据47苔原植物物种在18个高纬度地区沿着气候梯度。在所有物种中，叶片出现和开花的时间更敏感，在夏季温度的增加比温暖的高纬度地区寒冷。随着时间的推移，一个广泛分布的物种Cassiope tetragona的开花物候也出现了类似的模式。这些是第一批结果，突出了不同的物候反应的植物在气候梯度，并建议在开花时间收敛的可能性，因此，随着气候变暖，在不同纬度的基因流的增加。
Warmer temperatures are accelerating the phenology of organisms around the world. Temperature sensitivity of phenology might be greater in colder, higher latitude sites than in warmer regions, in part because small changes in temperature constitute greater relative changes in thermal balance at colder sites. To test this hypothesis, we examined up to 20 years of phenology data for 47 tundra plant species at 18 high-latitude sites along a climatic gradient. Across all species, the timing of leaf emergence and flowering was more sensitive to a given increase in summer temperature at colder than warmer high-latitude locations. A similar pattern was seen over time for the flowering phenology of a widespread species, Cassiope tetragona. These are among the first results highlighting differential phenological responses of plants across a climatic gradient and suggest the possibility of convergence in flowering times and therefore an increase in gene flow across latitudes as the climate warms.