Issue:ISSN 2095-1353
CN 11-6020/Q
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2012年49 No.6
The time structure and population dynamics of the desert-steppedarkling beetle community in Yanchi，Ningxia，China
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Key Words：darkling beetles，desert steppe，community composition，seasonal dynamics
Abstract：The community composition and seasonal dynamics of darkling beetles in six zones of desert steppe in Sidunzi，Yanchi，Ningxia were investigated using pitfall trapping． A total of 5 431 darkling beetles were collected from 20 speciesand 10 genera． The dominant species were Blaps femoralis femoralis Fischer-Waldheim and Microdera kraatzi kraatziReitter which accounted for 47. 30% and 40. 66% of all beetles captured． Various dominant species had different seasonaltrends． The abundance of M． kraatzi kraatzi peaked in May and July，whereas that of B． femoralis femoralis peaked in Mayand August． There was little fluctuation in the abundance of dominant species between different sampling plots． Bio-plotsof seasonal variables and the number of darkling beetles individuals from detrended correspondence analysis suggests thatdarkling beetles can be divided into five types，i． e． ，spring，spring-summer，summer，summer-autumn and perennial．The species diversity and abundance index of darkling beetles was higher in May than in other months． Hierarchal clusteranalysis indicates that the darkling beetle community could be classified into three groups in different months，and that this
classification reflects vegetation type and degree of disturbance．