TESTING A METAPOPULATION MODEL OF COEXISTENCE IN THE INSECT COMMUNITY ON RAGWORT (SENECIO-JACOBAEA)
TESTING A METAPOPULATION MODEL OF COEXISTENCE IN THE INSECT COMMUNITY ON RAGWORT (SENECIO-JACOBAEA)
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DOI：
10.1086/285755
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发表时间：
1995-04-01
影响因子：
2.9
通讯作者：
LEWINSOHN, TM
中科院分区：
文献类型：
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作者：
HARRISON, S;THOMAS, CD;LEWINSOHN, TM
本文对植食性昆虫豚草共存的超种群模型进行了检验。先前的研究表明，它们中的一些通过不断地殖民新的片地，在朱砂蛾（Tyria jacobaeae）对豚草的强烈而零星的落叶中存活下来。我们证实了这些昆虫之间强烈的不对称竞争，然而，我们发现包括朱砂蛾在内的所有昆虫都很容易在距离源380米的实验斑块上定居。在我们的研究系统中（在1.3 km(2)的区域内有60个豚草斑块），自然斑块之间的中位数和最大距离分别为20 m和85 m。由于相对于斑块间距离的高水平分散，超种群模型不太可能适用于该系统。我们提出了共存的其他方式，并建议，元人口假设需要更严格的审查比他们已经给出。
We tested a metapopulation model of coexistence for the insect herbivores of ragwort. Previous research suggested that some of them survive the intense but patchy defoliation of ragwort by the cinnabar moth (Tyria jacobaeae) by continually colonizing new patches of ragwort. We confirmed prior findings of strong asymmetric competition among these insects, However, we found that all insects, including the cinnabar moth, readily colonized experimental patches up to 380 m from a source. In our study system (60 ragwort patches in a 1.3-km(2) area), median and maximum distances between natural patches were 20 m and 85 m, respectively. Because of the high level of dispersal relative to interpatch distances, a metapopulation model is unlikely to apply in this system. We propose other means of coexistence and suggest that metapopulation hypotheses require more critical examination than they have been given.