METAPOPULATION PERSISTENCE OF AN ENDANGERED BUTTERFLY IN A FRAGMENTED LANDSCAPE
METAPOPULATION PERSISTENCE OF AN ENDANGERED BUTTERFLY IN A FRAGMENTED LANDSCAPE
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DOI：
10.2307/3546033
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发表时间：
1995-02-01
期刊：
影响因子：
3.4
通讯作者：
LEI, GC
中科院分区：
文献类型：
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作者：
HANSKI, I;PAKKALA, T;LEI, GC
我们描述了一项关于格兰维尔贝母 Melitaea cinxia 的广泛的集合种群研究，该研究在 1502 个离散栖息地斑块网络中进行，涵盖了该蝴蝶物种在芬兰的整个分布。对容易发现的幼虫群体进行的彻底调查显示，当地有 536 个斑块（干燥草甸）种群。我们证明该系统满足一个物种在随机局部灭绝和重新殖民之间保持平衡的四个必要条件。斑块占用模式支持多种定性和定量模型预测。随着栖息地斑块区域密度和平均面积的降低，蝴蝶出现在适宜栖息地的比例逐渐减少。据我们所知。这是基于对许多同种集合种群的比较得出的第一个结论性证明，表明栖息地占用率下降，因此栖息地破碎化加剧对生存造成的威胁日益增加。
We describe an extensive metapopulation study on the Glanville fritillary Melitaea cinxia, in a network of 1502 discrete habitat patches, comprising the entire distribution of this butterfly species in Finland. A thorough survey of the easily detected larval groups revealed a local population in 536 patches (dry meadows). We demonstrate that this system satisfies the four necessary conditions for a species to persist in a balance between stochastic local extinctions and recolonizations. Patterns of patch occupancy support several qualitative and quantitative model predictions. With decreasing regional density and average area of habitat patches, the butterfly occurs in a diminishing fraction of suitable habitat. To our knowledge. this is the first conclusive demonstration, based on a comparison of many conspecific metapopulations, of declining habitat occupancy and hence of increasing threat to survival caused by increasing habitat fragmentation.