Eco-evolutionary dynamics of prior selfing rate promotes the coexistence without niche partitioning under reproductive interference
Eco-evolutionary dynamics of prior selfing rate promotes the coexistence without niche partitioning under reproductive interference
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DOI：
10.1101/2020.04.07.029082
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发表时间：
2020-04
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影响因子：
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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
当两种或多种植物物种共享相同的传粉媒介时，传粉媒介介导的生殖干扰使共存变得困难。最近的研究表明，先前的自主自交可以减轻生殖干扰，可以在没有授粉生态位划分的情况下实现共存（先发制人的自交假说）。然而，考虑到种群规模、自交率和近交衰退的生态进化动态，目前还没有研究测试先前自交的进化是否促进共存。为了研究先验自交进化在相互生殖干扰下促进共存的条件，特别是从传粉媒介可用性和近交抑制动态的角度来看，我们构建了基于个体的模型，在该模型中，两个植物物种以相互生殖干扰的形式相互竞争，并且可以进化先验自主自交率。我们预计，清除有害突变可能会导致进化拯救，因为如果近交抑制的强度随着种群自交率的增加而降低，劣等物种可以通过先前自交的进化来拯救种群密度。我们的模拟表明，先前自交的进化可以促进共存，而生殖干扰会在没有进化的情况下导致竞争排斥。我们发现，较低的授粉媒介可用性往往更喜欢快速进化转变，而不是较高的先前自交率，它抵消了生殖干扰的负面影响，并且两个物种的种群动态都表现出中性随机游走。当近交抑制的强度随着种群自交率的增加而降低时，适度的授粉媒介可用性会导致长期共存，其中对先前自交率的相对丰度依赖的选择间歇性地挽救了劣等物种的种群密度。合成。我们表明，先前自交的进化可以提高劣等物种的种群增长率，从而实现与进化拯救的长期共存。这是解释密切相关的植物物种在没有生态位划分的情况下共同进化共存的新机制，并且与最近报道的密切相关的混合交配物种即使在相互生殖干扰下也能同域生长的研究一致。
When the two or more plants species share the same pollinators, pollinator-mediated reproductive interference make coexistence difficult. Recent studies suggested prior autonomous selfing mitigate reproductive interference, could enabling coexistence without pollination niche partitioning (pre-emptive selfing hypothesis). However, there are no studies to test whether evolution of prior selfing promote the coexistence, considering eco-evolutionary dynamics of population size, selfing rate and inbreeding depression. To examine conditions that the evolution of prior selfing promote coexistence under mutual reproductive interference especially in the point of view for pollinator availability and dynamics of inbreeding depression, we constructed individual-based model in which two plant species compete against each other in the form of mutual reproductive interference and can evolve prior autonomous selfing rate. We expected that purging of deleterious mutations could cause evolutionary rescue because inferior species could rescue population density through the evolution of prior selfing if the strength of inbreeding depression decreases with an increase of population’s selfing rate. Our simulation demonstrated that the evolution of prior selfing could promote the coexistence while reproductive interference caused competitive exclusion without evolution. We found that lower pollinator availability tended to prefer rapid evolutionary shift to higher prior selfing rate, it neutralizes the negative effect of reproductive interference, and population dynamics exhibit neutral random walk in both species. When the strength of inbreeding depression decreased with an increase in population’s selfing rate, moderate pollinator availability resulted in long-term coexistence in which relative-abundance-dependent selection on the prior selfing rate rescue population density of inferior species intermittently. Synthesis. We showed that the evolution of prior selfing could increase population growth rate of inferior species and consequently enable the long-term coexistence with evolutionary rescue. This is the new mechanisms explaining co-evolutionary coexistence of closely related plant species without niche partitioning and consistent with recent studies reported that closely related mixed-mating species are sympatrically growing even under the mutual reproductive interference.