Species abundance and the distribution of specialization in host–parasite interaction networks
Species abundance and the distribution of specialization in host–parasite interaction networks
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DOI：
10.1111/j.1365-2656.2005.00992.x
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发表时间：
2005-09
影响因子：
4.8
通讯作者：
D. Vázquez;R. Poulin;B. Krasnov;G. Shenbrot
中科院分区：
文献类型：
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作者：
D. Vázquez;R. Poulin;B. Krasnov;G. Shenbrot
摘要1.最近的研究评估了物种相互作用网络中的专业化分布。物种丰度模式已被假设，以确定观察到的拓扑模式。我们在宿主-寄生虫相互作用网络的背景下评估这一假设。2.我们使用了两个独立的系列数据集，一个由7个网站的数据描述淡水鱼和后生动物寄生虫之间的相互作用，另一个由25个地方的数据描述跳蚤和它们的哺乳动物宿主之间的相互作用。我们评估了物种丰度模式对这些宿主-寄生虫相互作用网络中专业化分布的影响。3.与最近对植物-动物互惠网络的研究平行，我们的分析表明，这些系统中的宿主-寄生虫相互作用是高度不对称的：专业寄生虫倾向于与寄生虫丰富度高的宿主相互作用，而寄生虫丰富度低的宿主倾向于主要与通才寄生虫相互作用。4.观察到的分布的专业化预测的零模型，假设物种特异性的概率被分配到一个链接在随机化过程中大致成比例的相对丰度。因此，丰富的宿主往往窝藏更丰富的寄生虫区系，具有高比例的罕见专家。
Summary 1. Recent studies have evaluated the distribution of specialization in species interaction networks. Species abundance patterns have been hypothesized to determine observed topological patterns. We evaluate this hypothesis in the context of host‐parasite interaction networks. 2. We used two independent series of data sets, one consisting of data for seven sites describing interactions between freshwater fish and their metazoan parasites and another consisting of data for 25 localities describing interactions between fleas and their mammalian hosts. We evaluated the influence of species abundance patterns on the distribution of specialization in these host‐parasite interaction networks with the aid of null models. 3. In parallel with recent studies of plant‐animal mutualistic networks, our analyses suggest that host‐parasite interactions in these systems are highly asymmetric: specialist parasites tend to interact with hosts with high parasite richness, whereas hosts with low parasite richness tend to interact mainly with generalist parasites. 4. The observed distribution of specialization was predicted by a null model that assumed that species-specific probabilities of being assigned a link during the randomization process were roughly proportional to their relative abundance. Thus, abundant hosts tend to harbour richer parasite faunas, with a high proportion of rare specialists.