Interaction intimacy affects structure and coevolutionary dynamics in mutualistic networks
Interaction intimacy affects structure and coevolutionary dynamics in mutualistic networks
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DOI：
10.1016/j.cub.2007.09.059
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发表时间：
2007-10-23
期刊：
影响因子：
9.2
通讯作者：
Thompson, John N.
中科院分区：
文献类型：
--
作者：
Guimaraes, Paulo R., Jr.;Rico-Gray, Victor;Thompson, John N.
互惠网络的结构为塑造生物多样性的过程提供了线索[1-10]。其中，互动亲密程度，即合作伙伴之间的生物关联程度，会导致专业化模式的差异[4, 11]，并可能影响网络组织[12]。在这里，我们研究了交互亲密性对互惠网络的结构和共同进化的潜在影响。从观察到的互利相互作用的选择过程来看，预计共生相互作用（高相互作用亲密性）将形成以区隔化为特征的物种匮乏的网络[12,13]，而非共生相互作用（低亲密性）将导致物种丰富的嵌套网络，其中有通才和专家的核心，经常与通才互动[3,5,7,12,14]。我们证明了 19 个蚂蚁-植物互惠网络中的相互作用亲密性和结构之间的关联。通过数值模拟，我们发现不同形式的互利共生的网络结构以不同的方式影响进化变化。一个物种的变化主要影响共生相互作用中的一个互利伙伴，但可能影响非共生相互作用中的多个伙伴。我们假设共生相互作用中的共同进化的特点是少数伙伴之间频繁的相互变化，但非共生网络中的共同进化可能会表现出罕见的变化爆发，其中许多物种对单个物种的进化变化做出反应。
The structure of mutualistic networks provides clues to processes shaping biodiversity [1-10]. Among them, interaction intimacy, the degree of biological association between partners, leads to differences in specialization patterns [4, 11) and might affect network organization [12]. Here, we investigated potential consequences of interaction intimacy for the structure and coevolution of mutualistic networks. From observed processes of selection on mutualistic interactions, it is expected that symbiotic interactions (high-interaction intimacy) will form species-poor networks characterized by compartmentalization [12,13], whereas nonsymbiotic interactions (low intimacy) will lead to species-rich, nested networks in which there is a core of generalists and specialists often interact with generalists [3, 5, 7,12,14]. We demonstrated an association between interaction intimacy and structure in 19 ant-plant mutualistic networks. Through numerical simulations, we found that network structure of different forms of mutualism affects evolutionary change in distinct ways. Change in one species affects primarily one mutualistic partner in symbiotic interactions but might affect multiple partners in nonsymbiotic interactions. We hypothesize that coevolution in symbiotic interactions is characterized by frequent reciprocal changes between few partners, but coevolution in nonsymbiotic networks might show rare bursts of changes in which many species respond to evolutionary changes in a single species.