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Specific sequence of arrival promotes coexistence via spatial niche pre-emption by the weak competitor
Ecology Letters ( IF 8.8 ) Pub Date : 2022-05-21 , DOI: 10.1111/ele.14021
Inês Fragata 1 , Raul Costa-Pereira 2 , Mariya Kozak 1 , Agnieszka Majer 3 , Oscar Godoy 4 , Sara Magalhães 1
Affiliation  

Historical contingency, such as the order of species arrival, can modify competitive outcomes via niche modification or pre-emption. However, how these mechanisms ultimately modify stabilising niche and average fitness differences remains largely unknown. By experimentally assembling two congeneric spider mite species feeding on tomato plants during two generations, we show that order of arrival affects species’ competitive ability and changes the outcome of competition. Contrary to expectations, order of arrival did not cause positive frequency dependent priority effects. Instead, coexistence was predicted when the inferior competitor (Tetranychus urticae) arrived first. In that case, T. urticae colonised the preferred feeding stratum (leaves) of T. evansi leading to spatial niche pre-emption, which equalised fitness and reduced niche differences, driving community assembly to a close-to-neutrality scenario. Our study demonstrates how the order of species arrival and the spatial context of competitive interactions may jointly determine whether species can coexist.

中文翻译:

特定的到达顺序通过弱竞争者的空间利基抢占促进共存

历史偶然性,例如物种到达的顺序,可以通过生态位修改或先发制人来改变竞争结果。然而,这些机制如何最终改变稳定生态位和平均适应度差异仍然很大程度上未知。通过在两代期间通过实验组装以番茄植物为食的两种同属红蜘蛛物种,我们表明到达顺序会影响物种的竞争能力并改变竞争结果。与预期相反,到达顺序并没有产生积极的频率依赖优先效应。相反,当劣势竞争者(Tetranychus urticae)首先到达时,就可以预测共存。在这种情况下,T荨麻疹定植于植物的首选摄食层(叶子)evansi导致了空间利基优先权,从而平衡了适应性并减少了利基差异,将社区组装推向了接近中立的情景。我们的研究证明了物种到达的顺序和竞争相互作用的空间背景如何共同决定物种是否可以共存。
更新日期:2022-05-21
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