为研究锦江河特有鱼类国家级水产种质资源保护区浮游动物群落结构特征，于2015年1月、4月、7月和10月按季度在锦江河保护区进行采样分析。结果显示，在保护区共采集到浮游动物4门51属82种，轮虫类、原生动物、桡足类和枝角类物种数占浮游动物物种总数的比例分别为46．34％、29．27％、15．85％和8．54％。优势种类为4门6属16种，其中轮虫类6种，原生动物4种，枝角类4种，桡足类2种。保护区浮游动物密度变幅为297．76～1430．10 ind／L，平均为855．13 ind／L；生物量变幅为5．73～26．36 mg／L，平均为14．37 mg／L；群落丰富度指数（Dm）变幅为3．18～4．90，平均为3．96；香农指数（H＇）变幅为2．11～3．12，平均为2．81；均匀度指数（J＇）变幅为0．81～0．89，平均为0．86。研究表明，在被摄食压力下降及饵料生物资源下降的共同影响下，保护区外界环境对个体较小的原生动物和轮虫有利，群落生态优势度也集中于上述浮游动物类群。受到水文特征的影响，锦江河核心区的浮游动物物种数、密度和生物量以及多样性指数总体高于实验区。%In order to explore the structure of zooplankton community in the National Aquatic Germplasm Reserve for Endemic Fish of Jinjiang River in different seasons, water samples were quarterly collected in January,April,July,and December,2015. The analysis results showed that 82 species belonging to 51 genera and 4 phyla were sampled,among which the rotiferos,protozoa,copepod and cladocera accounted for 46.34%, 29.27%,15.85% and 8.54%,respectively.Sixteen species of 6 genera and 4 phyla were identified as dominant species,including 6 species of rotiferos,4 of protozoa,4 of cladocera and 2 of copepod.The range of zooplankton density was 297.76-1 430.10 ind/L and the average was 855.13 ind/L.The range of zooplankton biomass was 5.73-26.36 mg/L and the average was 14.37 mg/L.Margalef index (Dm) ranged from 3.18-4.90 with the average being 3.96;Shannon-Weiner index (H') ranged from 2.11-3.12 and the average was 2.81; Peilou index ( J') ranged from 0. 81-0. 89 and the average was 0. 86. The study indicated that, under the common influence of both the degressive pressure from predators and the decrease in food organisms,small individuals like protozoa and rotifers could benefit from the external circumstances of the reserve, and as a result, ecological dominance of zooplankton community were inclined to these groups. Besides, impacted by hydrological characteristics,the number,density and biomass of zooplankton species as well as the biodiversity index of the core area of Jinjiang River excelled those of the experimental area in general.
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