Regional and local scale metapopulation dynamics in the interaction between Callosobruchus maculatus and Anisopteromalus calandrae
Regional and local scale metapopulation dynamics in the interaction between Callosobruchus maculatus and Anisopteromalus calandrae
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Callosbruchus maculatus 和 Anisopteromalus calandrae 之间相互作用的区域和局部规模的集合种群动态
DOI：
10.1111/j.1600-0706.2010.18275.x
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发表时间：
2010
期刊：
影响因子：
3.4
通讯作者：
Strevens C
中科院分区：
文献类型：
--
作者：
Strevens C
栖息地结构增加了许多容易灭绝的资源与消费者相互作用的持久性。集合种群理论是目前用来解释为什么局部短暂种群在区域范围内持续存在的主要方法之一。集合种群概念的核心是斑块之间发生的扩散量，过多或过少都会导致区域灭绝。在这项研究中，评估了扩散对过度利用的宿主与寄生蜂相互作用的种群动态的作用。在没有寄生蜂的情况下，高度灵活的豆象（Callosobchus maculatus）无论斑块间基质的渗透性如何，都可以保持相似的种群规模，并且表现出强烈的负密度依赖性。引入寄生蜂后，豆象数量减少，空斑的出现相应增加。在这种情况下，限制两个物种的扩散可以在更大程度上消除相互作用，并导致更大的区域类象种群数量。考虑到这两个物种的扩散率之间的差异，有人提出，更分散的宿主通过增加在空地定居和拯救易灭绝种群的机会，从景观渗透性的降低中受益。随着种群从自下而上的调节转向自上而下的调节，与寄生蜂的引入相关的是密度依赖性强度的转变。当考虑到单个斑块对区域动态的作用时，局部和区域尺度测量的重要性就显而易见了。仅考虑区域动态就忽视了分散机制对局部动态的重要性。同样，当检查局部动态时，发现斑块对区域动态有不同的影响，具体取决于扩散机制和斑块位置。
Habitat structure increases the persistence of many extinction‐prone resource–consumer interactions. Metapopulation theory is one of the leading approaches currently used to explain why local, ephemeral populations persist at a regional scale. Central to the metapopulation concept is the amount of dispersal occurring between patches, too much or too little can result in regional extinction. In this study, the role of dispersal on the metapopulation dynamics of an over‐exploitative host–parasitoid interaction is assessed. In the absence of the parasitoid the highly vagile bruchid,Callosobruchus maculatus, can maintain a similar population size regardless of the permeability of the inter‐patch matrix and exhibits strong negative density‐dependence. After the introduction of the parasitoid the size of the bruchid population decreases with a corresponding increase in the occurrence of empty patches. In this case, limiting the dispersal of both species decouples the interaction to a greater extent and results in larger regional bruchid populations. Given the disparity between the dispersal rates of the two species, it is proposed that the more dispersive host benefits from the reduction in landscape permeability by increasing the opportunity to colonise empty patches and rescue extinction prone populations. Associated with the introduction of the parasitoid is a shift in the strength of density‐dependence as the population moves from bottom–up towards top–down regulation. The importance of local and regional scale measurements is apparent when the role of individual patches on regional dynamics is considered. By only taking regional dynamics into account the importance of dispersal regime on local dynamics is overlooked. Similarly, when local dynamics were examined, patches were found to have different influences on regional dynamics depending on dispersal regime and patch location.
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影响因子：
2.7
作者：
Odette L. Sutcliffe;C. Thomas;T. Yates;J. Greatorex
通讯作者：
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影响因子：
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作者：
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DOI：
--
发表时间：
2007
期刊：
影响因子：
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作者：
P. Graniero
通讯作者：
P. Graniero
影响因子：
5.2
作者：
Anderson, GS;Danielson, BJ
通讯作者：
Danielson, BJ
DOI：
--
发表时间：
2001
期刊：
影响因子：
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作者：
E. Crone;D. Doak;Jouko Pokki
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