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How competitive intransitivity and niche overlap affect spatial coexistence
Oikos ( IF 3.4 ) Pub Date : 2020-11-12 , DOI: 10.1111/oik.07735
Yinghui Yang 1 , Cang Hui 2, 3
Affiliation  

Competitive intransitivity is mostly considered outside the main body of coexistence theories that rely primarily on the role of niche overlap and differentiation. How the interplay of competitive intransitivity and niche overlap jointly affects species coexistence has received little attention. Here, we consider a rock–paper–scissors competition system where interactions between species can represent the full spectra of transitive–intransitive continuum and niche overlap/differentiation under different levels of competition asymmetry. By comparing results from pair approximation that only considers interference competition between neighbouring cells in spatial lattices, with those under the mean‐field assumption, we show that 1) species coexistence under transitive competition is only possible at high niche differentiation; 2) in communities with partial or pure intransitive interactions, high levels of niche overlap are not necessary to beget species extinction; and 3) strong spatial clustering can widen the condition for intransitive loops to facilitate species coexistence. The two mechanisms, competitive intransitivity and niche differentiation, can support species persistence and coexistence, either separately or in combination. Finally, the contribution of intransitive loops to species coexistence can be enhanced by strong local spatial correlations, modulated and maximised by moderate competition asymmetry. Our study, therefore, provides a bridge to link intransitive competition to other generic ecological theories of species coexistence.

中文翻译:

竞争性的不及物和利基重叠如何影响空间共存

竞争性不及物性通常在共存理论的主体之外被考虑,而共存理论主要依赖于利基重叠和分化的作用。竞争性的不及物性和生态位重叠的相互作用如何共同影响物种的共存受到关注。在这里,我们考虑一个剪刀石头布的竞争系统,其中物种之间的相互作用可以代表不同竞争竞争水平下传递-非传递连续体和生态位重叠/分化的全谱。通过比较仅考虑空间晶格中相邻单元之间的干扰竞争的对近似结果以及在均值场假设下的结果,我们发现:1)传递竞争下的物种共存仅在高生态位分化下才可能;2)在具有部分或纯粹的不及物交互作用的社区中,高水平的生态位重叠对于引起物种灭绝不是必需的;3)强大的空间聚类可以拓宽不及物环的条件,以促进物种共存。竞争不及物性和生态位分化这两种机制可以单独或组合地支持物种的持久性和共存。最后,非传递循环对物种共存的贡献可以通过强大的局部空间相关性来增强,通过适度的竞争性不对称性来调节和最大化。因此,我们的研究提供了将不及物竞争与物种共存的其他通用生态学理论联系起来的桥梁。3)强大的空间聚类可以拓宽不及物环的条件,以促进物种共存。竞争不及物性和生态位分化这两种机制可以单独或组合地支持物种的持久性和共存。最后,非传递循环对物种共存的贡献可以通过强大的局部空间相关性来增强,通过适度的竞争不对称性进行调制和最大化。因此,我们的研究提供了将不及物竞争与物种共存的其他通用生态学理论联系起来的桥梁。3)强大的空间聚类可以拓宽不及物环的条件,以促进物种共存。竞争不及物性和生态位分化这两种机制可以单独或组合地支持物种的持久性和共存。最后,非传递循环对物种共存的贡献可以通过强大的局部空间相关性来增强,通过适度的竞争不对称性进行调制和最大化。因此,我们的研究提供了将不及物竞争与物种共存的其他通用生态学理论联系起来的桥梁。单独或组合使用。最后,非传递循环对物种共存的贡献可以通过强大的局部空间相关性来增强,通过适度的竞争性不对称性来调节和最大化。因此,我们的研究提供了将不及物竞争与物种共存的其他通用生态学理论联系起来的桥梁。单独或组合使用。最后,非传递循环对物种共存的贡献可以通过强大的局部空间相关性来增强,通过适度的竞争性不对称性来调节和最大化。因此,我们的研究提供了将不及物竞争与物种共存的其他通用生态学理论联系起来的桥梁。
更新日期:2020-11-12
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