Macroinvertebrates community structure in relation to environmental variables in the lower reaches of the Yalong River
ZHANG Kui1, ZHOU Lian-feng1, CHEN Wei1, SHAO Ke1, WU Wen-yong2, CHEN Yu-lin1, YANG Han1, MA Pei-ming1
1. Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem, Ministry of Water Resources, Institute of Hydrogeology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan 430079, China; 2. Yalong River Hydropower Development Company Limited, Chengdu 610051, China
Abstract：Surveys with 22 sampling sites were conducted in spring (May) and autumn (October) of 2020 to understand the impact of cascade hydropower development on macroinvertebrate community structure in the lower reaches of the Yalong River. The characteristics of macroinvertebrate community structure and its relationship with environmental variables at different groups of sampling sites (natural river sections, upstream and downstream of the dams) were analyzed. The results showed that a total of 82 macroinvertebrate species (genera) were identified and the dominant species were Chironomus sp. and Baetis sp.. In comparison to previous studies, the dominant species were only the species that adapted to static or slow-flowing water, and the species that adapted to fast-flowing water were not dominant anymore since the cascade hydropower development. The densities of macroinvertebrates in spring were significantly lower than those in autumn (n=42, P<0.05). However, no significant difference was found in density, biomass, richness, or the Shannon-Wiener diversity index between spring or autumn and among different groups of sites. PCoA and Adonis paired test analysis showed that there was no significant difference in community structure among sites from natural river sections, upstream of dams and downstream of dams in spring and autumn, respectively. In the temporal domain, the difference in community structure between spring and autumn was significant (n=42, P<0.01), and the main contributor was chironomid larvae. The CCA and Envfit analyses revealed that the main factors influencing the macroinvertebrate community structure in spring were Chl-a and CODMn, and in autumn NO2--N, TN, T, and EC.
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