种间竞争塑造互惠网络的结构稳定性
Interspecific competition shapes the structural stability of mutualistic networks
摘要：
互惠网络在维持生物多样性方面发挥着重要作用，因此在过去几十年中引起了生态学文献的越来越多的关注。在这里，我们开发了一个分析框架来研究这些网络的结构稳定性，包括互惠和竞争的相互作用。分析和数值分析表明，竞争网络的结构从根本上改变了群落中物种共存的必要条件。使用50个真正的互惠网络，我们表明，当共享的合作伙伴的相对重要性是通过加权竞争，在参数空间中的可行性区域是高度相关的5月的稳定性标准，可以预测的物种数量之间的函数关系，网络连接性和社区中的平均相互作用强度。我们的工作重新开启了十年之久的争论在生态群落的复杂性和稳定性的关系，并强调不同的相互作用类型的相对结构的作用。
英文摘要：
Mutualistic networks have attracted increasing attention in the ecological literature in the last decades as they play a key role in the maintenance of biodiversity. Here, we develop an analytical framework to study the structural stability of these networks including both mutualistic and competitive interactions. Analytical and numerical analyses show that the structure of the competitive network fundamentally alters the necessary conditions for species coexistence in communities. Using 50 real mutualistic networks, we show that when the relative importance of shared partners is incorporated via weighted competition, the feasibility area in the parameter space is highly correlated with May's stability criteria and can be predicted by a functional relationship between the number of species, the network connectance and the average interaction strength in the community. Our work reopens a decade-long debate about the complexity-stability relationship in ecological communities, and highlights the role of the relative structures of different interaction types.
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