Yang Gui-Jun, Wang Yuan, Wang Min
School of Life Sciences, Ningxia University, Yinchuan 750021, China.
Ying Yong Sheng Tai Xue Bao. 2021 Apr;32(4):1461-1470. doi: 10.13287/j.1001-9332.202104.032.
To understand the dynamics of spatial pattern of darkling beetle communities at the small scale, we surveyed the darkling beetle community using pitfall in a desert grassland of alluvial fans in Helan Mountain from May to October 2019. Based on the geostatistical analysis, we divided the 200 m×200 m study area equally into 100 grid squares and analyzed the spatial autocorrelation, spatial heterogeneity, spatial distribution pattern, and its relationship with topographic factors of the darkling beetle community. A total of 1086 individuals belonged to 10 species and 7 genera were collected. Community composition of darkling beetle had significant spatial and temporal variation. The diversity index of the community was the highest in May and lowest in July. The spatial autocorrelation of dominant species had obvious seasonal fluctuation, with a significantly spatial positive correlation in May, September, and October. Communities of darkling beetle and the dominant species showed strongly spatial heterogeneous, which were mainly determined by structural factors. The ordinary Kriging interpolation showed that the gradient distribution of beetle communities was obviously different among seasons, being the simplest in summer. The results of the cross variogram showed that the spatial relationships between different dominant species groups were mostly positive, and were mainly regulated by structural factors. Results of the canonical correspondence analysis (CCA) showed that the slope and elevation significantly affected the distribution of darkling beetles. Our results showed that the spatial heterogeneity of the darkling beetle showed significant seasonal variation, and thus provided a basis for understanding the mechanism and biodiversity of ground-dwelling beetle community in a desert grassland of alluvial fans.
为了解小型尺度下拟步甲群落空间格局的动态变化，我们于2019年5月至10月在贺兰山冲积扇荒漠草原采用陷阱法对拟步甲群落进行了调查。基于地统计学分析，我们将200 m×200 m的研究区域等分为100个网格方块，并分析了拟步甲群落的空间自相关性、空间异质性、空间分布格局及其与地形因子的关系。共采集到1086只个体，隶属于7属10种。拟步甲群落组成具有显著的空间和时间变化。群落多样性指数在5月最高，7月最低。优势种的空间自相关性具有明显的季节波动，在5月、9月和10月存在显著的空间正相关。拟步甲群落及其优势种表现出强烈的空间异质性，主要由结构因子决定。普通克里格插值法显示，甲虫群落的梯度分布在不同季节明显不同，夏季最为简单。交叉变异函数结果表明，不同优势种组之间的空间关系大多为正相关，且主要受结构因子调控。典范对应分析（CCA）结果表明，坡度和海拔显著影响拟步甲的分布。我们的结果表明，拟步甲的空间异质性表现出显著的季节变化，从而为理解冲积扇荒漠草原地表甲虫群落的机制和生物多样性提供了依据。
