Diversity of Metazoan Zooplankton and Its Relationship with Water Environmental Factors in Da’ao Reservoir

doi:10.11988/ckyyb.20230522

Abstract

Abstract:

To elucidate the community structure characteristics of metazoan zooplankton in Da’ao Reservoir and provide foundational data for assessing aquatic ecological health, we conducted two ecological surveys in August (wet season) and November (dry season) of 2021. The results are as follows: (1) We identified 26 species of metazoan zooplankton in Da’ao Reservoir, including 13 species of rotifers, 4 species of cladocerans, and 9 species of copepods. Dominant species included Keratella cochlearis, Polyarthra trigla, Diurella dixonnuttalli, Trichocerca pusilla, Pompholyxophrys trichocerca, Cylindrical Trichocerca, and Bosmina sp. (2) The density and biomass of metazoan zooplankton were higher during wet season (August) compared to dry season (November). (3) The average Shannon-Wiener index for metazoan zooplankton was 0.88 in wet season and 1.05 in dry season. Principal Coordinates Analysis (PCoA) revealed spatial distribution differences in the community structure during wet season; (4) Redundancy Analysis (RDA) indicated that the cumulative variation in species-environment relationships explained 62.4% and 65.1% of the total variation in wet and dry seasons, respectively. The permanganate index emerged as the primary driving factor influencing changes in the community structure of metazoan zooplankton in Da’ao Reservoir.

Key words: Da’ao Reservoir, meta-zooplankton, diversity, environmental factors

CLC Number:

LIU Xi, LEI Ming-jun, HUANG Xiao-long, WANG Meng-xue, LEI Qi. Diversity of Metazoan Zooplankton and Its Relationship with Water Environmental Factors in Da’ao Reservoir[J]. Journal of Changjiang River Scientific Research Institute, 2024, 41(9): 53-59.

Figures/Tables 8

Fig.1 Distribution of monitoring and sampling sites in Da’ao Reservoir

Fig.2 Seasonal variation of environmental factors in Da’ao Reservoir

Fig.3 Community structure of metazoan zooplankton in different areas of Da’ao Reservoir

Fig.4 Density and biomass of metazoan zooplankton in Da’ao Reservoir across different periods

Table 1 Dominant species and dominance ofmetazoan zooplankton in Da’ao Reservoir

种名	拉丁名	优势度
种名	拉丁名	丰水期	枯水期
螺形龟甲轮虫	Keratella cochlearis	0.51
针簇多肢轮虫	Polyarthra trigla	0.08	0.28
田奈同尾轮虫	Diurella dixonnuttalli		0.02
暗小异尾轮虫	Trichocerca pusilla		0.12
圆筒异尾轮虫	Trichocerca cylindrica		0.03
泡轮虫属	Pompholyx sp.	0.03
象鼻溞属	Bosmina sp.	0.05	0.07

Table 2 Metazoan zooplankton biodiversity in Da’ao Reservoir

位置	H
位置	8月份(丰水期)	11月份(枯水期)
库尾	0.09~1.18	0.14~1.32
库中	0.07~0.81	0.14~1.52
库湾	0.36~1.45	0.44~1.31
平均值	0.88	1.05

Fig.5 PCoA result of Da’ao Reservoir in dry and wet seasons

Fig.6 RDA result of environment-species of Da’ao Reservoir in dry and wet seasons

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