Data from: Climate warming: a loss of variation in populations can accompany reproductive shifts

The most documented response of organisms to climate warming is a change in the average timing of seasonal activities (phenology). Although we know that these average changes can differ among species and populations, we do not know whether climate warming impacts within-population variation in phenology. Using data from five study sites collected during a 13-year survey, we found that the increase in spring temperatures is associated with a reproductive advance of 10 days in natural populations of common lizards (Zootoca vivipara). Interestingly, we show a correlated loss of variation in reproductive dates within populations. As illustrated by a model, this shortening of the reproductive period can have significant negative effects on population dynamics. Consequently, we encourage tests in other species to assess the generality of decreased variation in phenological responses to climate change.生物体对气候变暖最广为记录的响应，是季节性活动平均时序的改变（物候学，phenology）。尽管我们已知这类平均变化会因物种和种群而异，但目前仍不清楚气候变暖是否会影响物候学的种群内变异。本研究基于一项为期13年的调查中采集自5个研究样地的数据，发现春季气温升高与胎生蜥（Zootoca vivipara）自然种群的繁殖物候提前10天存在关联。值得注意的是，我们还观测到种群内繁殖日期的变异程度出现了伴随性下降。如模型模拟所示，繁殖周期的缩短会对种群动态产生显著的负面影响。因此，我们呼吁在其他物种中开展相关验证研究，以评估气候变暖下物候响应变异降低的普遍性。