2013年4月24~25日观察了大辽河口碎波带浮游动物群落结构的昼夜变化。结果表明：共采集浮游动物4类16种属，其中淡水种类11种，半咸水种类5种，优势种为砂壳虫（Difflugia sp.），螺形龟甲轮虫（Keratella cochlearis），桡足幼体（Copepodid）及剑水蚤（Cyclops sp）等；密度的峰值出现在4月24日8：00（4504.28ind.·L-1），原生动物、轮虫类是影响密度变化的主要组成成分，占昼夜平均密度的78.0%；生物量高峰在4月25日20：00（23.757mg·L-1），桡足类生物量占99.5%，占昼夜平均生物量的91.6%。大辽河口碎波带浮游动物种类与浮游植物种类、密度呈显著正相关。初春大辽河口浮游动物丰富，为鱼类性腺发育、繁殖创造了良好的生态环境。%The diurnal rhythm of zooplankton community structure was investigated in the surf zone of Daliaohe River estuary on April 24~25, 2013. The results showed that the zooplankton assemblage was composed of 16 species in total, belonging to 4 taxonomic groups and 16 species or genera including 11 freshwater ones and 5 brackish ones, with predominant species were protozoa Difflugia sp.,rotifera Keratella cochlearis,copepoda copepodid and Cyclops sp. The peak zooplankton density (4504.28 ind.·L-1) was observed at 8:00 a.m, protozoa and rotifera accounting for 78.0%of total density, and being the main factors affecting the diurnal rhythm of den-sity. The peak zooplankton biomass (23.757mg·L-1) was found at 8:00 p.m on April 25, 2013, copepoda representing 99.5%of total biomass, and 91.6%of the average biomass. Moreover, the significant positive correlation was observed between the species composi-tion of zooplankton and the species composition and cell density of phytoplankton in the surf zone of Daliaohe River estuary. The abundant zooplankton in early spring provided a fairly good ecological environment for gonadal development, and reproduction of fishes.
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