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为了科学评价考洲洋海洋生态养殖示范区的渔业生态环境质量状况,1999年2月和8月对该湾浮游植物的种类组成及数量分布进行了调查研究,结果表明,调查海域共出现浮游植物188种,分属硅藻142种、甲藻22种、蓝藻5种、绿藻18种和裸藻1种共5大门类,硅藻是主要优势类群。种类组成以淡水、咸淡水的沿岸性种类为主,其区域分布和季节变动特征与调查海域海水盐度变动规律趋势一致。枯水期优势种有明显的区域差异,主要优势种为翼根管藻纤细变型、洛氏角毛藻和奇异菱形藻;丰水期优势种较为单一,大片海域均以中肋骨条藻和热带骨条藻为主要优势种,优势指数平均达95.8%,湾西北部海域则以银灰平列藻和中肋骨条藻为主要优势种。浮游植物群落多样性指数显示明显的季节和区域差异,呈现枯水期明显高于丰水期,西北部明显高于东南部趋势。浮游植物密度以丰水期明显高于枯水期,东南部海域明显高于西北部海域;丰水期平均密度达到26471.3×104ind·m-3,是枯水期的66.2倍;平面分布的季节变化显示明显差异,枯水期以东北部的吉隆河口和东南入海水道数量较高,而丰水期则表现为明显的自西北部向东南部海域递增的趋势。
In order to scientifically evaluate the quality of the fishery eco-environmental quality of the Kaowan Ocean Marine Ecological Farming Demonstration Zone, the species composition and quantity distribution of phytoplankton in the Bay were investigated in February and August 1999, and the results showed that phytoplankton 188 species, belonging to 142 species of diatoms, 22 species of dinoflagellates, 5 species of cyanobacteria, 18 species of green algae and 1 species of Euglena. The diatoms are the dominant groups. The species composition is dominated by the coastal species of freshwater and brackish freshwater. The regional distribution and seasonal variation are consistent with the trend of seawater salinity variation in the surveyed waters. The dominant species in the dry season had obvious regional differences. The dominant species were Agropyroxidosis, Chaetoceroseros major and Scutellaria barnitus; the predominant species in the wet season were relatively single, and the dominant species were Skeletonema costatum and tropical bones Algae as the main dominant species, the dominant index averaged 95.8%, while in the northwestern Gulf of China, Platymonas crenulata and Skeletonema costatum were the main dominant species. The diversity index of phytoplankton showed obvious seasonal and regional differences, showing the dry season was significantly higher than the wet season, northwest was significantly higher than the trend of the southeast. The density of phytoplankton in wet season was significantly higher than that in dry season, while that in southeastern part was significantly higher than that in northwestern part. The average density in flood season reached 26471.3 × 104ind · m-3, which was 66.2 times of that in dry season. The seasonal distribution of flat distribution showed significant difference In the dry season, the quantity of the Jilong River estuary and the southeastern inlet sea channel in the northeast of the dry season is high, while in the wet season the trend of increasing from the northwest to the southeast is apparent.