中文摘要：

利用典范对应分析（CCA）及曲线回归拟合,研究了宁夏贺兰山拟步甲科昆虫多样性及分布与地形的关系。结果表明：共调查到14属42种,其中,小圆鳖甲和阿小鳖甲为优势种,其个体数量分别占总捕获个体数的36.09%和19.14%。CCA分析显示,海拔、坡度和平面曲率对拟步甲昆虫的分布格局有显著影响。拟步甲昆虫丰富度和多样性分别与海拔呈显著的线性关系,个体数量与平面曲率呈显著的二次曲线关系。拟步甲昆虫的分布与坡度和坡向没有明显的回归关系,但拟步甲倾向于0°-15°坡度和西北坡向聚集。优势种小圆鳖甲与5个地形因子均不显著相关,因此在贺兰山的分布比较广泛。而优势种阿小鳖甲分布受海拔、坡度和平面曲率影响显著。

英文摘要：

Canonical correspondence analysis （CCA） and curve-fitting were used to explore the effects of topographic factors on the diversity and distribution patterns of darkling beetles in Henlan Mountain of Ningxia, China. A total of 3973 tenebrionid beetles were collected belonging to 42 species and 14 genera. Of these beetles, Scytosoma pygmaeum and Microdera kraatzi alashanica were the dominant species in the area, accounting for 36.09% and 19.14% of the total number of individuals, respectively. Results of CCA revealed that altitude, slope and plane curvature had significant effects on distribution pattern of darkling beetles. The abundance and diversity of darkling beetles had significant negative linear relations with altitude, and individuals had significant conical relationships with plane curvature. The spatial distribution patterns of darkling beetles had no significant regression relationships with slope and aspect, but tenebrionid beetles was mainly distributed in the region with slope of 0° -15°, and concentrated in the northwest aspect. Altitude, slope and plane curvature also had significant effects on distribution pattern of dominant species M. kraatzi alashanica, but distribution of S. pygmaeum which belongs to habitat generalist showed no significant correlation with five topographic factors.