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Using functional traits to represent functional components and functional diversity help us better understand ecosystem and community functions. Species’ functional traits are sensitive to environmental change, and can potentially indicate these changes through community and population succession. In order to grasp the spatial and temporal distribution pattern of functional characteristics and the influence of physicochemical factors on the functional diversity of benthic macroinvertebrates in Keqin Lake (in Zhalong National Nature Reserve of China), we investigated the benthic macroinvertebrates and physicochemical indexes in May, July and October 2019. Referring to the relevant literature, we selected the functional feeding groups and the locomotion groups for analysis. According to the research results, 21 taxa were identified; Palaemonidae, Viviparidae and Chironomidae accounted for the largest proportion, their relative abundances were 51.05%, 15.26%, and 13.68% respectively. OM (Omnivores) was the dominant group in the functional feeding groups, and CM (Climbers) was the dominant group among the locomotion groups. The One-way analysis of variance (ANOVA) and Honestly significant difference (HSD) tests showed significant differences in the following physicochemical factors: WT, SD, NTU, NH4-N, Cl and CODMn. Redundancy analysis (RDA) results displayed that CODMn, Cl and NTU were significant indexes that affected the functional feeding groups and the locomotion groups.

applied ecology and environmental research

FUNCTIONAL GROUPS OF BENTHIC MACROINVERTEBRATES IN RELATION TO PHYSICOCHEMICAL FACTORS IN KEQIN LAKE, ZHALONG NATIONAL NATURE RESERVE, NORTHEASTERN CHINA