科研之友
微信
新浪微博
Facebook
分享链接
摘要
The composition and structure of aquatic Coleoptera and Hemiptera assemblages in a small stream, Mauriagaon, flowing through Chakrashila Wildlife Sanctuary, a Key Biodiversity Area under the Critical Ecosystem Partnership Fund 2005 situated in Assam, India were analysed. The objectives were to describe the aquatic Coleoptera and Hemiptera from the stream,. seasonal variation in their abundance and dominance, and also examine to their relationship with the environmental variables of the water. A total of 7 species (2 Coleoptera and 5 Hemiptera) were recorded from the system. Three Hemipteran species (Ptilomera assamensis, Metrocoris nigrofashioides, Rhagovelia sumatrensis) and one Coleopteran species (Orectogyrus sp.) occurred throughout the year. Shannon Weiner diversity index values in different seasons ranged from 0.36 in post monsoon to 0.52 in pre monsoon, while Berger Parker Index of Dominance ranged from 0.46 in pre-monsoon to 0.72 in post monsoon. Canonical Correspondence Analysis (CCA) showed that the species-environment correlations of axis 1 and 2 were high, and the majority of species responded negatively to total alkalinity. The study on the aquatic insects of a lotic system is a pioneer study in the Sanctuary as no work has been done so far on this and the study add data of the faunal diversity of the Sanctuary. This study suggested that species richness and density of aquatic insects may indicate the conservation value of the habitats because of their significant responses to environmental factors.
- 出版日期2016-5
