长江口河口锋区浮游动物生态研究Ⅰ生物量及优势种的平面分布

AN ECOLOGICAL STUDY ON ZOOPLANKTON IN PLUME FRONT ZONE OF CHANGJIANG(YANGTZE) RIVER ESTUARINE AREA Ⅰ BIOMASS DISTRIBUTION OF DOMINANT SPECIES

据１９８８年及１９８９年于长江口羽状流锋区调查及东海水产研究所多年调查资料综合分析研究结果表明，浮游动物生物量在丰水期（１９８８年８月）的平均生物量为４３８毫克／米￣３，变异系数为０．７８；１９８９年８月平均生物量为３５０毫克／米￣３。生物量分布呈现自西北向东南部水域递增的趋向。高生物量主要分布于１２２°２０′─１２２°５０Ｅ，３０°５０′─３１°２０′Ｎ范围内，平均生物量高达９６２毫克／米￣３，变异系数为０．３２。生物量分布趋势与常年相同。而枯水期（１９８８年１２月）的平均生物量低，仅为６８．３８毫克／米￣３，变异系数为１．５，高生物量区较小分布不均匀。优势种中华哲水蚤Ｃａｌａｎｕｓｓｉｎｉｃｕｓ、乌啄尖头Ｐｅｎｉｌｉａａｖｉｒｏｓｔｒｉｓ、肥胖三角Ｅｖａｄｎｅｔｅｒｇｅｓｌｉｎａ、真刺唇角水蚤Ｌａｂｉｄｏｃｅｒａｅｕｃｈａｅｔａ、背针胸刺水蚤Ｃｅｎｔｒｏｐａｇｅｓｄｏｓｉｓｐｉｎａｔｕｓ、太平洋纺锤水蚤Ａｃａｒｔｉａｐａｃｉｆｉｃａ、虫肢歪水蚤Ｔｏｒｔａｎｕｓｖｅｒｍｉｃｕｌｕｓ、肥胖箭虫Ｓａｇｉｔｔａｅｎｆｌａ─ｔａ、海龙箭虫Ｓａｇｉｔｔａｎａｇａｅ等多种浮游动物为长江口外的优势种，并对其数量分布进?

The data of flood and dry seasons in 1988,8 and flood season in 1989,12 through surveying in Changjiang River estuarine area as well as the analytical result ob-tained by ECSFRI for many years are as follows:1.Biomass of Zooplankton:In flood period(1988,8):The average biomass is 488mg/m￣3,and variation coefficient 0.78.In August 1989,biomass was 350mg/m￣3 with a tendency of increasing gradually from the northwest to the southeast.High biomass was mainly distributed within the range of 122°20′─122°50′,30°50′and 31°20′.Mean biomass was as high as 962mg/m￣3,variation coefficient 0.32.Trend of biomass distribution was similar to that in normal year.In dry period (1988,12):Mean biomass was only 68.32 mg/m￣3 and variation coefficient,1.5.High biomass zone was smaller and its distribution was not even.2.Dominant species (1988,12):There are9 dominant species:Calanus sinensis,Pe-nilia avirostris, Evadne tergeslina,Labidoceraeuchaeta,Centropages dorsispinatus,Acarti-a.pacifica,Tortanus vermiculars,Sagitta enflata and Sagitta nagae.The paper deals with and explores the quantitative distribution of the above species.The paper deals with and analysis the relationship between biological and nonbiological environmental factors such as the quantitative distribution zooplankton of biomass and ecological characteristics of the dominant species the distribution and runoff,temperature,salinity,phytoplank-ton,pollutants,sediment,prey animal,etc.