Inter-annual facilitation via pollinator support arises with species-specific germination rates in a model of plant–pollinator communities
Inter-annual facilitation via pollinator support arises with species-specific germination rates in a model of plant–pollinator communities
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DOI：
10.1098/rspb.2022.1485
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发表时间：
2023-01
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通讯作者：
Aubrie R. M. James
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作者：
Aubrie R. M. James
便利化对于理解社区多样性动态可能很重要，但其无数潜在机制尚未得到充分研究。例如，对植物中传粉媒介介导的促进作用的研究通常集中在共花物种如何在一个季节内促进彼此的授粉。然而，传粉媒介介导的促进作用也可能以跨年度授粉支持的形式出现，其中共存的植物种群通过提供动态稳定性来支持传粉媒介种群，从而相互促进。在这项工作中，我测试这一假设与模拟模型的一年生开花植物和蜜蜂授粉种群，以确定是否以及如何跨年度授粉支持影响的持久性和/或稳定性的模拟社区。两个物种的植物群落坚持在较高的利率比单物种的社区，和促进最强的社区与低的平均发芽率和高度物种特异性的环境变化的反应。单物种群落往往比它们的同行更稳定，可能是因为生存持久的单物种群落必然更稳定，随着时间的推移，以支持授粉。这项工作表明，竞争和促进可以同时影响植物种群动态。它还重要地确定了一年生植物群落的关键特征，这些特征可能表现出跨年度的授粉支持-那些发芽率低和物种特异性变化的反应。
Facilitation is likely important for understanding community diversity dynamics, but its myriad potential mechanisms are under-investigated. Studies of pollinator-mediated facilitation in plants, for example, are typically focused on how co-flowering species facilitate each other's pollination within a season. However, pollinator-mediated facilitation could also arise in the form of inter-annual pollination support, where co-occurring plant populations mutually facilitate each other by providing dynamic stability to support a pollinator population through time. In this work, I test this hypothesis with simulation models of annual flowering plant and bee pollinator populations to determine if and how inter-annual pollination support affects the persistence and/or stability of simulated communities. Two-species plant communities persisted at higher rates than single-species communities, and facilitation was strongest in communities with low mean germination rates and highly species-specific responses to environmental variation. Single-species communities were often more stable than their counterparts, likely because of survivorship—persistent single-species communities were necessarily more stable through time to support pollinators. This work shows that competition and facilitation can simultaneously affect plant population dynamics. It also importantly identifies key features of annual plant communities that might exhibit inter-annual pollination support- those with low germination rates and species-specific responses to variation.