黄海夏季典型站位的底边界层动物

The Benthic Boundary Layer Fauna at a Typical Station in the Yellow Sea in Summer

2002年8月25～26日, 在黄海夏季冷水团区域内的抛锚站位(35°22′N, 121°59′E),使用柱状界面采样器进行了昼夜连续取样,对底边界层动物的种类组成与昼夜丰度变化进行了研究,以获得对黄海底边界层动物的初步认识.共记录底边界层动物21种, 隶属18科、19属.超底栖动物和中型浮游动物是黄海夏季底边界层动物的2个重要类群, 主要种类有尖额真猛水蚤(Euterpina acutifrons)、挪威小毛猛水蚤(Microsetella norvegica)、异厚盖钩虾(Synchelidium miraculum)、双刺纺缍水蚤(Acartia bifilosa)和小拟哲水蚤(Paracalanus parvus), 其丰度皆有明显的昼夜波动现象.以桡足类无节幼体为代表的小型浮游动物也是底边界层动物中不容忽视的类群之一.采集到5个黄海区的新记录物种:美丽猛水蚤(Nitocra sp.)、跛足猛水蚤(Mesochra sp.)、咸水剑水蚤(Halicyclops sp.)、掌刺梭剑水蚤(Lubbockia squillimana)和异厚盖钩虾(Synchelidium miraculum), 显示出底边界层动物种类组成的特殊性.

For preliminary understanding of the Benthic Boundary Layer （BBL） fauna in the Yellow Sea, species composition and diel abundance variation of the fauna at a typical station in the Yellow Sea were studied in this paper. Diel samples were collected with a midicorer at an anchor station （35°22′N, 121°59′E） from 25 to 26 August 2002. Twenty-one species belonging to 18 families, 19 genuses were classified from the samples, and sorted into four biological assemblages, i.e. microzooplankton, mesozooplankton, macrozooplankton, and hyperbenthos. The BBL fauna was dominated by hyperbenthos and mesozooplankton, with the main species of Euterpina acutifrons, Microsetella norvegica , Synchelidium miraculum , Acartia bifilosa , and Paracalanus parvus, all fluctuating in abundance day and night. As a result, the total abundance and biomass of the BBL fauna changed dynamically during a day, with the lowest values of 3 500 ind./m^3 and 6.73mg/m^3 respectively at dawn, and the highest values of 5 403ind./m^3 and 21.03mg/m^3 respectively at midday. A number of copepod nauplii was collected in the samples indicats that the microzooplankton is not negligible in the BBL fauna. Five species were identified to be new records in the Yellow Sea, namely Nitocra sp., Mesochra sp., Halicyclops sp., Lubbockia squillimana and Synchelidium miraculum, revealing the particularity of the BBL fauna structure.