Global mean temperatures have increased by 0.72 $$^\circ $$ ∘ C since the 1950s, and climate warming is resulting in geographical shifts in the range limits of many species. Climate velocity is estimated to be 0.42 km/year, and if a species fails to adapt to the new climate, it must track the location of its climatically constrained niche in order to survive. Dispersal has an important role to play in enabling a population to shift is geographical range limits, but many species are partially sedentary, with only a fraction of the population dispersing each year. We ask, can partially sedentary populations keep pace with climate or will such populations be more vulnerable to extinction? Through the development of a moving-habitat integrodifference equation model, we show that, provided climate velocity is not too large, partially sedentary populations can outperform fully dispersing populations in one of two ways: (i) by persisting at climate speeds where a fully dispersing population cannot, and (ii) exhibiting higher population densities. Moreover, we find that positive density-dependent dispersal can further improve the likelihood a population can persist. Our results highlight the positive role that non-dispersers may play in mitigating the effects of overdispersal and facilitating population persistence in a warming world.

中文翻译：

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我应该留下还是应该去：在应对气候引起的范围变化方面，部分久坐的人口可以胜过完全分散的人口

自 1950 年代以来，全球平均温度增加了 0.72 $$^\circ $$ ∘ C，气候变暖导致许多物种的范围限制发生地理变化。气候速度估计为 0.42 公里/年，如果一个物种无法适应新的气候，它必须追踪其受气候限制的生态位的位置才能生存。地理范围限制在使种群转移方面发挥着重要作用，但许多物种部分是久坐不动的，每年只有一小部分种群在分散。我们问，部分久坐的人群能否跟上气候的步伐，还是这些人群更容易灭绝？通过移动栖息地积分差异方程模型的发展，我们表明，只要气候速度不太大，部分定居人口可以通过以下两种方式之一胜过完全分散的人口：(i) 以完全分散的人口不能的气候速度持续存在，以及 (ii) 表现出更高的人口密度。此外，我们发现正密度依赖性扩散可以进一步提高种群持续存在的可能性。我们的研究结果强调了非扩散者在减轻过度扩散的影响和促进人口在变暖的世界中的持久性方面可能发挥的积极作用。