Arid Zone Research ›› 2023, Vol. 40 ›› Issue (5): 840-848.doi: 10.13866/j.azr.2023.05.16

• Ecology and Environment • Previous Articles    

Survey of species diversity of darkling beetles in the Minqin temperate desert steppe

TA Fuyuan1(),ZHANG Hongyang1,GOU Wenshan1,MA Weixin2,HU Guixin1()   

  1. 1. Pratacultural College, Gansu Agricultural University, Engineering and Technology Research Center for Alpine Rodent Pest Control National Forestry and Grassland Administration, Lanzhou 730070, Gansu, China
    2. Minqin County Grassland Workstation, Wuwei 733399, Gansu, China
  • Received:2022-12-03 Revised:2023-02-12 Online:2023-05-15 Published:2023-05-30

Abstract:

To clarify the diversity and temporal dynamics of darkling beetles in Minqin temperate desert grassland, this study systematically investigated the communities of different subtypes of darkling beetles in gravelly, sandy, and saline desert grasslands in Minqin County, Gansu Province, from April to October 2021 using the pitfall trapping method. In this survey, 8492 individuals of 10 species in 8 genera were captured. The dominant species in the desert steppe in general were Microdera elegans and Sternoplax setosa setosa, which accounted for 26.57% and 25.07%, respectively, of the total individuals, whereas Eumylada potanini was an endemic species in gravelly desert grassland. The number of darkling beetles of their respective species in the three subtypes of desert grasslands peaked in July and dropped to the lowest level in October. The community abundance and Shannon-Wiener diversity index of the darkling beetles were significantly higher than those in saline desert grassland (P<0.05), and the community richness of darkling beetles was significantly higher than that of sandy desert grassland (P<0.05). The diversity of the darkling beetles was closely correlated with environmental factors: The community abundance index was significantly negatively correlated with the height of the vegetation community, soil water content, and vegetation cover (P<0.05). The abundance index of the darkling beetles was significantly positively correlated with the plant Shannon-Wiener diversity index and plant richness (P<0.05). The vegetation composition of the desert grassland is simple; therefore, the community composition of the darkling beetles is also simple. The plant diversity index and plant richness are higher in gravelly desert grasslands than in saline desert grasslands and sandy desert grasslands, so the darkling beetles are the most abundant in gravelly desert grasslands.

Key words: desert grasslands, darkling beetles, species, diversity, time dynamics