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首页> 外文期刊>Zoologia (Curitiba) >The effects of four types of anthropogenic disturbances on composition and abundance of terrestrial isopods (Isopoda: Oniscidea)
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The effects of four types of anthropogenic disturbances on composition and abundance of terrestrial isopods (Isopoda: Oniscidea)

机译：四种类型的人为干扰对陆生等足动物组成和丰度的影响（等足类：Oniscidea）

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The Brazilian Atlantic Forest is currently reduced to about 12% of its original range. Among the components that make up its great diversity, there are species with the potential to be bioindicators, which can be very important for conservation-oriented studies. This study compares the species composition, abundance and sex ratio of terrestrial isopods in sites that show different anthropogenic disturbance histories and are located within four reserves in the Atlantic Forest of southwestern Brazil. Our study explores these crustaceans as indicators of anthropogenic disturbance. The influence of one of the following factors was explored in each protected area: 1) history of vegetation harvesting, 2) trail management, 3) Eucalyptus planting, and 4) edge effect. A total of 2,217 individuals of six species (Atlantoscia sp., Benthana werneri Lemos de Castro, 1958, Pseudodiploexochus tabularis (Barnard, 1932), Pudeoniscus obscures Lemos de Castro, 1973, Styloniscus spinosus (Patience, 1907), and Trichorhina sp.) were captured in pitfall traps. The composition of isopod species was different between most of the contrasting sites within reserves, and was similar among the less disturbed sites of different reserves. The total number of isopod individuals and the sex ratio were not different between the contrasting sites within most of the reserves and only the sex ratio of Atlantoscia sp. differed between contrasting sites of one protected area. Upon an individual analysis of each species, S. spinosus (an exotic species) was most abundant in more disturbed sites. The distributions of B. werneri and Atlantoscia sp. over time were relatively synchronous, except where S. spinosus was abundant. Our results also indicate that the exotic species S. spinosus may benefit from the vegetation mosaic produced by disturbance, so differences in abundance of this species may be useful for bioindication. A change in the spatial and temporal structure of Oniscidea communities caused by anthropogenic disturbance may have a cascade effect on ecological cycles because terrestrial isopods play a fundamental role in nutrient cycling.
机译：目前，巴西大西洋森林已减少到其原始范围的12％。在构成其多样性的各个组成部分中，有一些物种可能成为生物指示剂，这对于注重保护的研究可能非常重要。这项研究比较了显示不同人为干扰历史并位于巴西西南部大西洋森林的四个保护区内的陆地等足动物的种类组成，丰度和性别比。我们的研究探索了这些甲壳类动物作为人为干扰的指标。在每个保护区中探究了以下因素之一的影响：1）植被收获的历史，2）步伐管理，3）桉树种植和4）边缘效应。共有2217个物种，共6种（Atlantoscia sp。，Benthana werneri Lemos de Castro，1958，Pseudodiploexochus tabularis（Barnard，1932），Pudeoniscus遮盖了Lemos de Castro，1973，Styloniscus spinosus（Patience，1907）和Trichorhina sp。被捕获在陷阱陷阱中。在保护区内的大多数对比点之间，异足动物的组成是不同的，在不同保护区的较少受干扰的点之间，也是相似的。在大多数保护区中，对比点之间的等足类个体总数和性别比没有差异，只有Atlantoscia sp。的性别比没有差异。一个保护区的对比点之间存在差异。通过对每种物种的单独分析，棘刺葡萄球菌（一种外来物种）在受干扰较大的地区最为丰富。 B. werneri和Atlantoscia sp。的分布。随着时间的推移，它们相对同步，除非棘刺葡萄球菌丰富。我们的研究结果还表明，外来物种刺棘可能受益于扰动产生的植被镶嵌，因此该物种的丰度差异可能对生物指示有用。人为干扰引起的Oniscidea群落的时空结构变化可能对生态循环具有级联效应，因为陆生等足动物在养分循环中起着基本作用。

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