The eco‐evolutionary dynamics of prior selfing rates promote coexistence without niche partitioning under conditions of reproductive interference
The eco‐evolutionary dynamics of prior selfing rates promote coexistence without niche partitioning under conditions of reproductive interference
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DOI：
10.1111/1365-2745.13768
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发表时间：
2021-01
影响因子：
5.5
通讯作者：
K. R. Katsuhara;Yuuya Tachiki;Ryosuke Iritani;A. Ushimaru
中科院分区：
文献类型：
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作者：
K. R. Katsuhara;Yuuya Tachiki;Ryosuke Iritani;A. Ushimaru
当两个或两个以上的植物物种共享相同的传粉者时，可能会发生传粉者介导的生殖干扰。最近的研究表明，先前的自主自交减轻了生殖干扰，即使在没有授粉生态位划分的情况下也可能促进共存（即先发制人的自交假说）。然而，在种群规模、自交率和近交衰退的生态进化动力学背景下，先前自交的进化是否促进了共存，仍然知之甚少。我们构建了一个基于个体的模型来研究在相互生殖干扰的背景下，先前自交的进化促进共存的条件。在该模型中，两种植物通过相互生殖干扰的方式竞争，并且都有可能进化出优先自主自交的能力。我们预计，清除有害突变可能会导致进化拯救，假设近亲繁殖衰退的强度随着种群自交率的增加而下降;这将使劣势竞争者能够通过先前自交的进化来维持种群密度。我们的模拟表明，先前的自交的进化可能会促进共存，而在没有这种进化的情况下，生殖干扰的竞争排斥的结果。我们发现，较低的传粉者的可用性可能有利于快速进化的转变，以更高的先前的自交率，从而中和在这两个物种的繁殖干扰的负面影响。当近交衰退的强度随着群体水平自交率的增加而降低时，适度的传粉者可用性导致长期共存，其中对先前自交率的相对丰度依赖性选择用于间歇性地维持劣势竞争者的群体密度。合成.我们证明，先前自交的进化可能会增加劣势竞争者的种群增长率，从而通过进化拯救促进长期共存。这构成了一种新的机制，解释了没有生态位划分的密切相关的植物物种的共同进化共存，并且与最近的研究报告相一致，即具有混合交配系统的密切相关的物种可以共域共存，即使在相互生殖干扰的条件下。
Pollinator‐mediated reproductive interference can occur when two or more plant species share the same pollinators. Recent studies have suggested that prior autonomous selfing mitigates reproductive interference, potentially facilitating coexistence even in the absence of pollination niche partitioning (i.e. the pre‐emptive selfing hypothesis). However, whether the evolution of prior selfing promotes coexistence, in the context of the eco‐evolutionary dynamics of population size, selfing rates and inbreeding depression, remains poorly understood. We constructed an individual‐based model to examine the conditions under which the evolution of prior selfing promotes coexistence in the context of mutual reproductive interference. In the model, two plant species compete by way of mutual reproductive interference, and both have the potential to evolve the capacity for prior autonomous selfing. We expected that purging of deleterious mutations might result in evolutionary rescue, assuming that the strength of inbreeding depression declines as the population selfing rate increases; this would enable inferior competitors to maintain population density through the evolution of prior selfing. Our simulation demonstrated that evolution of prior selfing may promote coexistence, whereas reproductive interference in the absence of such evolution results in competitive exclusion. We found that lower pollinator availability is likely to favour rapid evolutionary shifts to higher prior selfing rates, thereby neutralising the negative effects of reproductive interference in both species. When the strength of inbreeding depression decreased with an increase in the population‐level selfing rate, moderate pollinator availability resulted in long‐term coexistence in which relative abundance‐dependent selection on the prior selfing rate served to intermittently maintain the population density of the inferior competitor. Synthesis. We demonstrate that the evolution of prior selfing may increase population growth rates of inferior competitors and may consequently promote long‐term coexistence via an evolutionary rescue. This constitutes a novel mechanism explaining the co‐evolutionary coexistence of closely related plant species without niche partitioning, and is consistent with recent studies reporting that closely related species with mixed mating systems can co‐occur sympatrically, even under conditions of mutual reproductive interference.