Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Disentangling the effects of external perturbations on coexistence and priority effects
Journal of Ecology ( IF 5.3 ) Pub Date : 2020-01-09 , DOI: 10.1111/1365-2745.13349 Chuliang Song 1 , Rudolf P. Rohr 2 , David Vasseur 3 , Serguei Saavedra 1
中文翻译：
区分外部干扰对共存和优先效应的影响
更新日期：2020-01-09
Journal of Ecology ( IF 5.3 ) Pub Date : 2020-01-09 , DOI: 10.1111/1365-2745.13349 Chuliang Song 1 , Rudolf P. Rohr 2 , David Vasseur 3 , Serguei Saavedra 1
Affiliation
|
- A major challenge in ecological research is to identify the tolerance of ecological communities to external perturbations. Modern coexistence theory (MCT) has been widely adopted as a framework to investigate the tolerance to perturbations in relative reductions of per capita growth rates, often using metrics that explicitly eliminate the independent role of intrinsic growth rates. More recently, the structural approach (SA) was introduced to investigate the tolerance of communities to perturbations in intrinsic growth rates as a function of the strength of intraspecific and interspecific competition. Because the external perturbations are likely to happen in both intrinsic growth rates and competition strengths, no framework alone can fully disentangle the effects of external perturbations.
- Here we combine MCT and SA to disentangle the tolerance in coexistence and priority effects of a pair of competing species when subject to perturbations in intrinsic growth rates and competition strengths. Through this combination, we reveal the emergence of a key trade‐off: increasing the tolerance to perturbations in intrinsic growth rates typically decreases the tolerance in competition strengths, and vice versa. Furthermore, this trade‐off is stronger under coexistence than under priority effects.
- We test this combined framework on competing pairs of 18 California annual plant species. For both coexistence and priority effects, we find that the tolerance to perturbations in intrinsic growth rates is maximized instead of that to perturbations in competition strengths in the studied annual plant communities.
- Synthesis . Our combined framework of modern coexistence theory and structural approach illustrates that it is possible to disentangle the impact of different external perturbations on the persistence of species. Importantly, our findings show that species interactions may reveal whether communities are dominated either by changes in intrinsic growth rates or by competition strengths. Overall, this combined framework can open a new perspective to understand and predict the response of populations to changing environmental conditions.
中文翻译：
区分外部干扰对共存和优先效应的影响
- 生态研究的主要挑战是确定生态群落对外部干扰的耐受性。现代共存理论（MCT）已被广泛用作研究人均增长率相对降低的摄动容忍度的框架，通常使用明确消除内在增长率的独立作用的指标。最近，引入了结构方法（SA）来研究群落对内在增长率扰动的耐受性，这是种内和种间竞争强度的函数。因为外部干扰可能同时发生在固有增长率和竞争优势上，所以没有任何一个框架可以单独消除外部干扰的影响。
- 在这里，我们将MCT和SA结合起来，以解决内在增长率和竞争强度受到干扰时，一对竞争物种共存和优先效应的容忍度。通过这种结合，我们揭示了一个关键权衡的出现：提高对内在增长率扰动的容忍度通常会降低竞争优势的容忍度，反之亦然。此外，在共存下这种权衡比在优先效应下更强。
- 我们在加利福尼亚18种年度植物物种的竞争对中测试了此组合框架。对于共存效应和优先效应，我们发现在所研究的年度植物群落中，对内在增长率扰动的容忍度最大化，而不是对竞争强度扰动的容忍度。
- 综合。我们现代共存理论和结构方法的综合框架表明，有可能弄清各种外部扰动对物种持久性的影响。重要的是，我们的研究结果表明，物种之间的相互作用可能揭示社区是被内在增长率的变化还是竞争优势所主导。总体而言，该组合框架可以开辟一个新的视角，以了解和预测人口对不断变化的环境条件的反应。
京公网安备 11010802027423号