Yu Xiao-Dong, Luo Tian-Hong, Zhou Hong-Zhang, Yang Jian
Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China.
Environ Entomol. 2007 Apr;36(2):348-55. doi: 10.1603/0046-225x(2007)36[348:docbcc]2.0.co;2.
This paper studied the occurrence of carabid beetles (Coleoptera: Carabidae) in the forest edge, the adjacent forest interior, and the surrounding grassland in southwestern China. Beetles were collected with pitfall traps along five replicated transects. Forest species rarely penetrated into the grassland from the forest interior, and the grassland specialists were not found in the forest interior. The forest edge hosted additional species from the adjacent grassland that increased its overall species richness. Nearly all forest species (23 of 24 species) and grassland species (13 of 15 species) can be found in the forest edge. Carabids of the forest edge were more similar to those of the forest interior than to those of the grassland by ordination and cluster analysis. Based on the specificity and fidelity, carabids can be distinguished into five species groups: habitat generalists, grassland-associated species, forest generalists, forest specialists, and edge-associated species. Multiple linear regression analysis showed that canopy cover and/or shrub cover were the most important factors in determining the richness, abundance, and diversity of carabids. The forest edge may serve as a transition zone for dispersal and re-colonization of carabid beetles from adjacent habitats and therefore is important for natural conservation.
本文研究了中国西南部森林边缘、相邻的森林内部以及周边草地中步甲科甲虫（鞘翅目：步甲科）的分布情况。沿着五条重复样带，使用陷阱诱捕器收集甲虫。森林物种很少从森林内部渗透到草地中，在森林内部也未发现草地特有的物种。森林边缘有来自相邻草地的其他物种，这增加了其总体物种丰富度。几乎所有的森林物种（24种中的23种）和草地物种（15种中的13种）都能在森林边缘被发现。通过排序和聚类分析，森林边缘的步甲与森林内部的步甲比与草地的步甲更为相似。根据物种特异性和忠诚度，步甲可分为五个物种组：栖息地广适种、与草地相关的物种、森林广适种、森林特化种和与边缘相关的物种。多元线性回归分析表明，树冠覆盖度和/或灌木覆盖度是决定步甲丰富度、多度和多样性的最重要因素。森林边缘可能作为步甲从相邻栖息地扩散和重新定殖的过渡区，因此对自然保护具有重要意义。
