In order to discover the plankton distribution patterns and its relationship with environment gradients and hydrological connectivity in wetlands, samples from Yellow River Delta that span gradients in salinity and hydrological connectivity were analyzed in this study. Plankton community composition, abundance and biomass were determined and correlated with water variables and hydrological connectivity indexes to gain information about the forces that structure the plankton community in this dynamic environment. Phytoplankton with a total of 88 species and zooplankton with a total of 49 species were observed at an average abundance of 4.11 × 10⁷ cells/L and 951.27 ind./L, respectively. Predominant species were Merismopedia minima G.Beck/Merismopedia elegans A. Braun ex Kützing (Cyanobacteria) and Trichocerca pusilla (Jennings) (Rotifera), accounting for over 10% of the total abundance of phytoplankton and zooplankton, respectively. The dominant species of phytoplankton communities were shifted from freshwater Chlorophyta (e.g., Oocystis sp.) to brackish Cyanobacteria (e.g., Merismopedia minima and Merismopedia elegans) and then to marine cyanobacterium (e.g., Oscillatoria sp. and Pseudoanabaena sp.); That shift in zooplankton community was from freshwater rotifers Trichocerca pusilla and Polyarthra trigla (Ehrenberg) to brackish rotifer Brachionus urceus (Linnaeus) and copepod Thermocyclops spp. and then to marine copepods Sinocalanus spp. and Microsetella spp. toward the river mouth. However, abundance, biomass and community similarity of plankton decreased with increasing water salinity and decreasing hydrological connectivity from upper reaches to river mouth. Salinity gradient could be major force for the shift of plankton community while the increasing hydrological connectivity between freshwater and saline habitats promoted the similarity of plankton distribution patterns within the wetland network.

为了发现湿地浮游生物的分布模式及其与环境梯度和水文连通性的关系，本研究对黄河三角洲的盐度和水文连通性梯度进行了分析。确定浮游生物群落的组成，丰度和生物量，并将其与水变量和水文连通性指数相关联，以获取有关在这种动态环境中构造浮游生物群落的力的信息。浮游植物总数为88种，浮游动物总数为49种，平均丰度分别为4.11×10 ⁷细胞/ L和951.27 ind./L。优势种为极小Merismopedia G.Beck /秀丽线虫A. Braun exKützing（蓝藻）和Trichocerca pusilla（Jennings）（Rotifera），分别占浮游植物和浮游动物总丰度的10％以上。浮游植物的主要种类从淡水绿藻（如Oocystis sp。）转移到半咸蓝藻（如Merismopedia minima和Merismopedia elegans），然后再转移到海洋蓝藻（如Oscillatoria sp。和Pseudoanabaena sp。）。浮游动物群落的变化是从淡水轮虫Trichocerca pusilla和Polyarthra trigla（Ehrenberg）到微咸的轮虫Brachionus urceus（Linnaeus）和co足类的Thermocyclops spp。然后到海洋co足中华Sino（Sinocalanus spp）。和Microsetella spp。朝河口。然而，随着水盐度的增加和上游到河口水文连通性的降低，浮游生物的丰度，生物量和群落相似性降低。盐度梯度可能是造成浮游生物群落迁移的主要力量，而淡水和盐类生境之间不断增加的水文联系促进了湿地网络内浮游生物分布模式的相似性。