黄海夏季底边界层动物的种类与丰度

2002年8月沿青岛至济州岛断面，在黄海的4个站位上进行了底边界层动物昼夜连续采样，对底边界层动物的种类组成及其丰度的变动进行了分析研究。结果显示，黄海夏季底边界层动物的主要类群是浅海底动物和中型浮游动物，种类丰度的昼夜差异不显著。主要种类有尖额谐猛水蚤(Euterpina acutifrons)、挪威小毛猛水蚤(Microsetella norvegica)、戴氏猛水蚤(Danielssenia sp．)、小拟哲水蚤(Paracalanus parvus)和双刺纺缍水蚤(Acartia bifilosa)等。底边界层动物的丰度，在细砂底质环境的站位最低，在具有粉砂一黏土底质环境的站位皆较高。通过聚类分析，可将这两种底质环境上的底边界层动物在26．55%相似性水平上分为两个类型。BIOENV分析表明，水深、底层水温及底质类型是影响海洋底边界层动物种类组成与丰度的重要因子。

Species and abundance of the benthic boundary layer fauna of the Yellow Sea in Summer

Samples of benthic boundary layer (BBL) fauna were collected by a MIDICORER at four stations in transect from Qingdao to Chejudo Island in the Yellow Sea in August 2002. Diel variations of species and abundance of the BBL fauna were studied in this paper. The results showed that the BBL fauna was dominated by suprabenthos and mesozooplankton in abundance, and the main species contained Euterpina acutifrons, Microsetella norvegica, Danielssenia sp., Paracalanus parvus and Acartia bifilosa. Statistically,there were no significant differences in species and abundance between day and night.The total abundance of BBL fauna at the station with fine sand sediments was lower than that at the station with silt-clay sediments. For these two sedimentary conditions, the BBL fauna could be formed, based on species and abundance,into two Bray-Curtis clusters joining at a distance of 26.55%. The BIOENV analysis revealed that water depth, bottom temperature and sediment type are all the important environmental factors influencing upon the species and abundance of BBL fauna.