Mean growth rate when rare is not a reliable metric for persistence of species.,Ecology Letters

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Mean growth rate when rare is not a reliable metric for persistence of species.
Ecology Letters ( IF 7.6 ) Pub Date : 2019-11-21 , DOI: 10.1111/ele.13430
Jayant Pande ₁ , Tak Fung ₂ , Ryan Chisholm ₂ , Nadav M Shnerb ₁

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The coexistence of many species within ecological communities poses a long-standing theoretical puzzle. Modern coexistence theory (MCT) and related techniques explore this phenomenon by examining the chance of a species population growing from rarity in the presence of all other species. The mean growth rate when rare, E [ r ] , is used in MCT as a metric that measures persistence properties (like invasibility or time to extinction) of a population. Here we critique this reliance on E [ r ] and show that it fails to capture the effect of temporal random abundance variations on persistence properties. The problem becomes particularly severe when an increase in the amplitude of stochastic temporal environmental variations leads to an increase in E [ r ] , since at the same time it enhances random abundance fluctuations and the two effects are inherently intertwined. In this case, the chance of invasion and the mean extinction time of a population may even go down as E [ r ] increases.

中文翻译：

稀有时的平均增长率不是确定物种持久性的可靠指标。

生态群落中许多物种的共存构成了一个长期的理论难题。现代共存理论（MCT）和相关技术通过检查存在其他所有物种的稀有物种种群增长的机会来探索这种现象。在MCT中，罕见情况下的平均增长率E [r]被用作衡量人口的持久性（如入侵性或灭绝时间）的指标。在这里，我们对这种对E [r]的依赖进行了批判，并表明它无法捕获时间随机丰度变化对持久性的影响。当随机时态环境变化幅度的增加导致E [r]的增加时，该问题变得尤为严重。因为同时它会增加随机丰度的波动，并且这两种效应在本质上是交织在一起的。在这种情况下，人口的入侵几率和平均灭绝时间甚至会随着E [r]的增加而下降。

更新日期：2019-11-22

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