Central and rear-edge populations can be equally vulnerable to warming.
Central and rear-edge populations can be equally vulnerable to warming.
复制标题
中央和后边的种群同样容易受到变暖的影响。
DOI：
10.1038/ncomms10280
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发表时间：
2015-12-22
影响因子：
16.6
通讯作者：
Campbell AH
中科院分区：
文献类型：
--
作者：
Bennett S;Wernberg T;Arackal Joy B;de Bettignies T;Campbell AH
后（暖）缘种群通常被认为比中心（冷）种群更容易受到变暖的影响，因为它们经历的环境温度更高，但这忽略了耐热性局部变化的可能性。在这里，我们提供了概念模型，说明如何在一个物种的地理范围内对气候变暖的敏感性受到影响，为当地适应和非适应人口。我们测试这些模型的范围收缩海藻从海洋热浪和12个月的实验观察，中央，现在和历史范围边缘位置之间的移位海藻。生长、生殖发育和存活在中央和后缘种群中表现出不同的温度阈值，但具有2.5 °C的异常阈值。因此，范围收缩反映了局部异常的变化，而不是绝对温度的差异。这表明，在一个物种的地理范围内，对变暖的敏感性可能是相似的，并强调了将当地的适应和驯化纳入气候变化脆弱性评估的重要性。 低纬度人口往往被认为更容易受到气候变化的影响，因为温暖的环境条件。在这里，班尼特等人表明，不同地区的海藻种群具有不同的耐热阈值，但对变暖有着非常相似的热安全裕度。
Rear (warm) edge populations are often considered more susceptible to warming than central (cool) populations because of the warmer ambient temperatures they experience, but this overlooks the potential for local variation in thermal tolerances. Here we provide conceptual models illustrating how sensitivity to warming is affected throughout a species' geographical range for locally adapted and non-adapted populations. We test these models for a range-contracting seaweed using observations from a marine heatwave and a 12-month experiment, translocating seaweeds among central, present and historic range edge locations. Growth, reproductive development and survivorship display different temperature thresholds among central and rear-edge populations, but share a 2.5 °C anomaly threshold. Range contraction, therefore, reflects variation in local anomalies rather than differences in absolute temperatures. This demonstrates that warming sensitivity can be similar throughout a species geographical range and highlights the importance of incorporating local adaptation and acclimatization into climate change vulnerability assessments. Low latitude populations are often thought to be more vulnerable to climate change due to warmer ambient conditions. Here, Bennett et al. show that populations of seaweed from different areas of their range have distinct thermal-tolerance thresholds, but share remarkably similar thermal safety margins to warming.