Montane species track rising temperatures better in the tropics than in the temperate zone,Ecology Letters

当前位置： X-MOL 学术 › Ecol. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Montane species track rising temperatures better in the tropics than in the temperate zone
Ecology Letters ( IF 7.6 ) Pub Date : 2021-05-17 , DOI: 10.1111/ele.13762
Benjamin G Freeman _{1,

2} , Yiluan Song ₃ , Kenneth J Feeley ₄ , Kai Zhu ₃

Affiliation

Many species are responding to global warming by shifting their distributions upslope to higher elevations, but the observed rates of shifts vary considerably among studies. Here, we test the hypothesis that this variation is in part explained by latitude, with tropical species being particularly responsive to warming temperatures. We analyze two independent empirical datasets—shifts in species’ elevational ranges, and changes in composition of forest inventory tree plots. Tropical species are tracking rising temperatures 2.1–2.4 times (range shift dataset) and 10 times (tree plot dataset) better than their temperate counterparts. Models predict that for a 100 m upslope shift in temperature isotherm, species at the equator have shifted their elevational ranges 93–96 m upslope, while species at 45° latitude have shifted only 37–42 m upslope. For tree plots, models predict that a 1°C increase in temperature leads to an increase in community temperature index (CTI), a metric of the average temperature optima of tree species within a plot, of 0.56°C at the equator but no change in CTI at 45° latitude (–0.033°C). This latitudinal gradient in temperature tracking suggests that tropical montane communities may be on an “escalator to extinction” as global temperatures continue to rise.

中文翻译：

山地物种在热带地区比在温带地区更好地追踪温度上升

许多物种通过将它们的分布向上倾斜到更高的海拔来应对全球变暖，但观察到的变化率在不同的研究中差异很大。在这里，我们检验了这种变化部分由纬度解释的假设，热带物种对变暖的温度特别敏感。我们分析了两个独立的经验数据集——物种海拔范围的变化，以及森林清单树图组成的变化。热带物种比温带物种好 2.1-2.4 倍（范围偏移数据集）和 10 倍（树图数据集）。模型预测，对于温度等温线上坡 100 m 的变化，赤道上的物种将它们的海拔范围上移了 93-96 m，而纬度 45° 的物种仅上移了 37-42 m。对于树状图，模型预测温度升高 1°C 会导致群落温度指数 (CTI) 升高，CTI 是一个地块内树种的平均温度最佳指标，在赤道上升 0.56°C，但没有变化在 45° 纬度 (–0.033°C) 的 CTI 中。温度跟踪中的这种纬度梯度表明，随着全球气温持续上升，热带山地群落可能处于“灭绝的自动扶梯”上。

更新日期：2021-07-12

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11