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首页> 外文期刊>Conservation Biology >Effects of forest fragmentation on a dung beetle community in French Guiana
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Effects of forest fragmentation on a dung beetle community in French Guiana

机译：森林破碎对法属圭亚那粪甲虫群落的影响

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摘要

Fragmentation is the most common disturbance induced by humans in tropical forests. Some insect groups are particularly suitable for studying the effects of fragmentation on animal communities because they are taxonomically and ecologically homogenous. We investigated the effects of forest fragmentation on a dung beetle species community in the forest archipelago created in 1994-1995 by the dam of Petit Saut, French Guiana. We set and baited an equal number of pitfall traps for dung beetles on three mainland sites and seven island sites. The sites ranged from 1.1 to 38 ha. In 250 trap days, we captured 50 species in 19 genera. Diversity indices were high (2.18-4.06). The lowest diversity was on the small islands and one mainland site. Species richness and abundance were positively related to fragment area but not to distance from mainland or distance to the larger island. The islands had lower species richness and population than mainland forest, but rarefied species richness was relatively invariant across sites. There was a marked change in species composition with decreasing fragment that was not caused by the presence of a common fauna of disturbed area species on islands. Small islands differed from larger islands, which did not differ significantly from mainland sites. Partial correlation analyses suggested that species richness and abundance of dung beetle species were positively related to the number of species of nonflying mammals and the density index of howler monkeys (Alouatta seniculus), two parameters positively related to fragment area.
机译：破碎是人类在热带森林中引起的最常见干扰。一些昆虫群在分类学和生态学上是同质的，因此特别适合研究破碎对动物群落的影响。我们调查了森林破碎对法属圭亚那Petit Saut大坝在1994-1995年间创建的森林群岛中的甲虫物种群落的影响。我们在三个大陆地点和七个岛屿地点设置并诱捕了相等数量的粪便甲虫陷阱陷阱。场地范围从1.1到38公顷。在250天的捕获时间内，我们捕获了19个属的50种。多样性指数很高（2.18-4.06）。多样性最低的是小岛和一个大陆站点。物种的丰富度和丰度与碎片面积成正相关，但与大陆的距离或与大岛的距离无关。这些岛屿的物种丰富度和种群数量少于大陆森林，但稀有物种的丰富度在各个地点相对不变。物种组成发生了显着变化，碎片减少，这并不是由岛屿上受干扰地区物种的共同动物区系引起的。小岛屿与大岛屿不同，大岛屿与大陆地区没有太大差异。部分相关分析表明，粪甲虫种类的丰富度和丰度与非飞行哺乳动物的种类数量和of猴的密度指数呈正相关，这两个参数与片段面积成正比。

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