Characteristics of Plankton Community Structure and Estimation of Fish Productivity in Guangrong Reservoir

doi:10.11924/j.issn.1000-6850.casb2025-0064

Abstract

Abstract:

To investigate the characteristics of the plankton community structure in Guangrong Reservoir in Neijiang City, Sichuan Province, and to propose suggestions for improving the fisheries ecology of the reservoir, plankton samples were collected from the reservoir in October 2020 and June 2021, and the collected samples were identified, classified, and counted. The community structure was analyzed by Shannon-Wiener diversity index, Margalef richness index and Pielou evenness index, and the fish productivity was estimated by ecological model. A total of 86 species of phytoplankton belonging to 8 phyla were identified during the two surveys, with an average density of 2.77×10⁸ ind./L and an average biomass of 19.7 mg/L. Among them, cyanobacteria had a higher density, with dominant species including Pseudanabaena, Nitzschia linearis, and Cryptomonas erosa. A total of 39 species of zooplankton were identified, with an average density of 5493.7 ind./L and an average biomass of 5.768 mg/L. Rotifers and protozoa had higher densities, with dominant species being Polyarthra trigla and Trichocerca pusilla. Diversity index analysis results showed that the average Shannon-Wiener diversity index for phytoplankton was 0.98, and was 2.16 for zooplankton. The average Margalef richness index for phytoplankton was 3.09, and was 2.72 for zooplankton. The average Pielou evenness index for phytoplankton was 0.24, and was 0.69 for zooplankton. Based on the density and biomass of plankton, the fish productivity of Guangrong Reservoir was estimated to be approximately 87.52 tons. The study indicated that the water quality of Guangrong Reservoir is generally at the level of medium to heavy pollution. To ensure the survival rate of released fish species, it is recommended to release 47000 Hypophthalmichthys molitrix and 11000 Aristichthys nobilis, along with some benthic and detritus-feeding fish species, thereby effectively slowing down or controlling eutrophication in the water body and providing certain economic benefits.

Key words: Guangrong Reservoir, plankton, community structure, fish productivity, ecological release

ZHENG Yuchen, TAO Min, FANG Di’an, XU Dongpo, QIN Chuanjie. Characteristics of Plankton Community Structure and Estimation of Fish Productivity in Guangrong Reservoir[J]. Chinese Agricultural Science Bulletin, 2025, 41(29): 157-164.

Figures/Tables 9

References 38

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Shannon-Wiener多样性指数	水质类型	Margalef丰富度指数	水质类型	Pielou均匀度指数	水质类型
H'≥4	清洁	d≥4	清洁	0.8≤J<1.0	清洁
3≤H'<4	轻污染	3≤d<4	轻污染	0.5≤J<0.8	轻污染
2≤H'<3	β-中污染	2≤d<3	β-中污染	0.3≤J<0.5	中污染
1≤H'<2	α-中污染	1≤d<2	α-中污染	0≤J<0.3	重污染
H'<1	重污染	d<1	重污染

Shannon-Wiener多样性指数	水质类型	Margalef丰富度指数	水质类型	Pielou均匀度指数	水质类型
H'≥4	清洁	d≥4	清洁	0.8≤J<1.0	清洁
3≤H'<4	轻污染	3≤d<4	轻污染	0.5≤J<0.8	轻污染
2≤H'<3	β-中污染	2≤d<3	β-中污染	0.3≤J<0.5	中污染
1≤H'<2	α-中污染	1≤d<2	α-中污染	0≤J<0.3	重污染
H'<1	重污染	d<1	重污染

门类	种类数/种
门类	秋季	夏季
蓝藻门	13	9
甲藻门	2	1
硅藻门	6	6
隐藻门	3	3
裸藻门	-	5
绿藻门	44	28
金藻门	1	-
黄藻门	-	1

门类	种类数/种
门类	秋季	夏季
蓝藻门	13	9
甲藻门	2	1
硅藻门	6	6
隐藻门	3	3
裸藻门	-	5
绿藻门	44	28
金藻门	1	-
黄藻门	-	1

门类	种属	拉丁名	优势度
门类	种属	拉丁名	6月	10月
蓝藻门	假鱼腥藻属	Pseudanabaena	0.073	0.174
甲藻门	多甲藻	Peridinium	0.022	-
硅藻门	线性菱形藻	Nitzschia linearis	0.044	0.020
硅藻门	梅尼小环藻	Cyclotella meneghiniana	-	0.044
隐藻门	卵形隐藻	Cryptomonas ovata	-	0.023
隐藻门	啮蚀隐藻	Cryptomonas erosa	0.023	0.268
绿藻门	四角盘星藻	Pediastrum tetras	-	0.026