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Corridor length and patch colonization by a butterfly, Junonia coenia

机译：走廊长度和斑块定居由一只蝴蝶，Junonia coenia

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Corridors have been proposed to reduce isolation and increase population persistence in fragmented landscapes, yet little research has evaluated the types of landscapes in which corridors will be most effective. I tested the hypothesis that corridors increase patch colonization by a butterfly, Junonia coenia, regardless of the butterfly's initial distance from a patch. I chose J. coenia because it has been shown to move between patches preferentially through corridors. Individuals were released 16-192 m away from open experimental patches into adjacent open corridors or forest. Neither corridors nor distance had a significant effect on patch colonization, but there was a significant interaction between the presence or absence of corridors and distance. At small distances (16-64 m), J. coenia was more likely to colonize open patches when released within forest than within open corridors, most likely because J. coenia used corridors as habitat. Nevertheless, patch colonization by butterflies released within forest decreased rapidly as distance from patches increased, as predicted by a null model of random movement. Colonization did not change with distance in the corridor, and at long distances (128-192 m), butterflies released in corridors were twice as likely to colonize open patches as those released in forest. These results suggest that one critical factor, interpatch distance, may determine the relative effectiveness of corridors and other landscape configurations, such as stepping stones, in reducing isolation in fragmented landscapes. When distances between patches are short compared to an animal's movement ability, a stepping stone approach may most effectively promote dispersal. Alternatively, the conservation value of corridors is highest relative to other habitat configurations when longer distances separate patches in fragmented landscapes. [References: 37]
机译：已经提出了走廊以减少零散景观中的孤立性并增加人口的持久性，但很少有研究评估走廊最有效的景观类型。我检验了这样的假设：无论蝴蝶与斑块的初始距离如何，走廊都会增加蝴蝶（Junonia coenia）对斑块的定居。我之所以选择J. coenia，是因为它已显示出优先在走廊之间穿过斑块。个体从开放的实验斑块离开16-192 m，释放到相邻的开放走廊或森林中。走廊和距离都没有对斑块定居产生显着影响，但是走廊的存在与否与距离之间存在显着的相互作用。在小距离（16-64 m）处，科恩尼亚烟草在森林中释放时比在开放走廊内更容易在开放斑块上定居，这很可能是因为科涅尼亚使用走廊作为栖息地。然而，如随机运动的无效模型所预测，随着离斑块距离的增加，被释放到森林中的蝴蝶的斑块定居迅速减少。殖民地没有随走廊的距离而变化，并且在长距离（128-192 m）处，在走廊中释放的蝴蝶在开放斑块中定植的可能性是在森林中释放的蝴蝶的两倍。这些结果表明，补丁间距是一个关键因素，它可以确定走廊和其他景观配置（例如垫脚石）在减少零散景观中的隔离度方面的相对有效性。当补丁之间的距离比动物的移动能力短时，垫脚石方法可能最有效地促进分散。另外，当更长的距离将零散的景观中的斑块分开时，相对于其他栖息地配置，走廊的保护价值最高。 [参考：37]

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