关键词: 大坳水库, 后生浮游动物, 时空变化, 环境响应

Abstract: In order to reveal the community structure characteristics of meta-zooplankton in Daao Reservoir and provide basic data for aquatic ecological health assessment, two ecological investigations were carried out in August (wet season) and November (dry season) of 2021. The results showed that: (1) 26 species of 3 types of meta-zooplankton were identified in Daao Reservoir, including 13 species of rotifers, 4 species of cladocera and 9 species of copepods. The dominant species were keratella cochlearis, polyarthra trigla, diurella dixonnuttalli, trichocerca pusilla, pompholyxophrys trichocerca cylindrica and bosmina sp; (2) The density and biomass of meta-zooplankton in Daao Reservoir during the wet season (August) are higher than those during the dry season (November); (3) The average shannon wiener index of meta-zooplankton in Daao Reservoir is 0.88 and 1.05 in wet season and dry season. The PCoA analysis results show that there are spatial distribution differences in the community structure of meta-zooplankton in wet season; (4) RDA redundancy analysis results show that the total interpretation rates of cumulative variation of species environment in Daao Reservoir in wet season and dry season are 62.4% and 65.1%, respectively. Permanganate index is the main driving factor affecting the changes of community structure of meta-zooplankton in Daao reservoir.

Key words: Daao reservoir, meta-zooplankton, spatiotemporal variation, environmental response