Diversity and spatial niche of grasshoppers in alpine steppe of Gansu Province
To explore the species diversity of locusts and grasshoppers in the alpine grasslands of Gansu Province,locust and grasshopper samples were collected from four habitats in Gansu Province. The study analyzed species diversity and spatial niche of locusts and grasshoppers. A total of 3550 insects were collected belonging to five families,15 genera and 31 species. Among them,three dominant spe-cies were identified:Chorthippus fallax,Bryodema kozlovi and Oedaleus decorus asiaticus,including 12 common species and 16 rare species. The diversity index,richness index and evenness index of lo-cust and grasshopper community in lowland meadows (with 19 species) were significantly higher than those in other habitats,followed by temperate deserts and mountain meadows,with 17 and 16 species of locust and grasshopper species,respectively. Alpine meadow had the lowest diversity index,richness in-dex,evenness index,but the highest dominance index,with 15 species recorded. Furthermore,the locust and grasshopper communities in alpine meadow and mountain meadows,as well as those in lowland meadows and temperate deserts,exhibited moderate similarity. According to niche width analysis of the 31 locust and grasshopper species,the top five were Ch. albonemus (0.758),Ch. dubius (0.667),Bryo-dema kozlovi (0.633),Myrmeleotettix palpalis (0.582),and Angaracris barabensis (0.559). Only six pairs of locust and grasshopper species had a niche overlap index greater than 0.30,with the highest overlap (0.34) obserbed Angaracris barabensis and Bryodema tuberculatum dilutum. All other pairs had a niche overlap index below all less than or equal to 0.30. The niche proportion similarity further re-flected the niche overlap index,and only five pairs of locust and grasshopper species had the highest similarity coefficient of 1.00. Many locust and grasshopper species showed no spatial niche similarity. These results indicated that differences in locust and grasshopper community composition and diversity among the four main grassland types in Gansu Province.
万方数据
维普
