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Armstrong-McGehee mechanism revisited: Competitive exclusion and coexistence of nonlinear consumers

机译：重新研究Armstrong-McGehee机制：非线性消费者的竞争排斥和共存

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A number of mechanisms have been proposed to explain the coexistence of species engaging in exploitative competition. The Armstrong-McGehee mechanism relies on different levels of nonlinearity in functional response between competing consumers and their ability to avoid competitive exclusion through temporal resource partitioning during endogenously generated fluctuations. While previous studies have mainly focused on cases where one consumer has nonlinear functional response and the other consumer has linear functional response, our study assessed coexistence and competitive exclusion under a more realistic scenario with two nonlinear consumers. Using analytical and numerical methods we found that the potential of coexistence of the two consumers decreases with increasing nonlinearity in the more linear species; increasing nonlinearity in the more nonlinear species, however, resulted in non-monotonic changes in the parameter space allowing coexistence. When coexistence potential is quantified under the presupposition that each consumer must be able to persist with the resource by itself, coexistence becomes consistently less likely with increasing similarity of the functional responses of the two consumers. Our results suggest that the Armstrong-McGehee mechanism is unlikely to operate as the sole coexistence-promoting mechanism in communities with generally nonlinear consumer-resource interactions. However, its role as a module in more complex systems and in synergy with other factors remains to be established.
机译：已经提出了许多机制来解释参与剥削竞争的物种的共存。 Armstrong-McGehee机制依赖于竞争的消费者之间的功能响应及其在内生性波动期间通过时间资源分配避免竞争排斥的能力的不同程度的非线性。尽管先前的研究主要集中在一个消费者具有非线性功能响应而另一个消费者具有线性功能响应的情况下，但我们的研究评估了在具有两个非线性消费者的更为现实的情况下的共存和竞争排斥。使用分析和数值方法，我们发现，随着线性度越高，两个消费者的共存潜力就越降低。但是，更多非线性物种中非线性的增加会导致参数空间的非单调变化，从而实现共存。当以每个消费者必须能够独自使用资源为前提来量化共存潜力时，随着两个消费者功能响应的相似性不断提高，共存的可能性就会越来越小。我们的研究结果表明，在具有一般非线性的消费者-资源交互作用的社区中，Armstrong-McGehee机制不太可能充当唯一的共存促进机制。但是，它在更复杂的系统中以及与其他因素协同作用中作为模块的作用仍有待确立。

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