珠江口横琴岛海域春季海洋浮游生物的初步研究

Plankton in Hengqin Island Sea in the Pearl River Estuary in spring

根据2008年5月在珠江口横琴岛海域的调查采样,本文对该海域的叶绿素a、初级生产力(C)、浮游动、植物进行了初步的研究,分析了浮游动、植物的种类组成、群落结构、数量和生物量等。结果表明,叶绿素a浓度和初级生产力(C)均值分别为5.27 mg·m^(-3)和123.56 mg·m^(-2)·d^(-1)。浮游植物共有111种,以硅藻为主,绝对优势种为中肋骨条藻Skeletonema costatum,调查海域浮游植物平均细胞丰度为6 832.75×10~4cell·m^(-3),以近海广布种为主要类群,多样性指数和均匀度均值分别为2.29和0.45。浮游动物共有41种,暖水种沿岸类群种类占大多数,以中华异水蚤Acartiella sinensis为绝对优势种,平均丰度和生物量分别742.25 ind·m^(-3)和131.12 mg·m^(-3),多样性指数和均匀度均值分别为2.54和0.67。

The authors conducted a field investigation in Hengqin Island Sea in May 2008, and studied the chlorophyll a content, primary production, zooplankton and phytoplankton. Some parameters such as composition, community structure, abundance and biomass of phytoplankton and zooplankton were analyzed. The results showed that the average chlorophyll a content and primary production was 5.27 mg·m^-3 and 123.56 mg·m^-2·d^-1, respectively. 111 phytoplankton species were identified. Phytoplankton communities were dominated by BaciUariophyta and the absolute dominant species was Skeletonema costatum. The main ecological group of phytoplankton was nearshore group; the average cell density of phytoplankton was 6 832.75× 10^4 cell·m^-3. 41 zooplankton species were identified, among which the absolute dominant species is Acartiella sinensis. The main ecological group of zooplankton was warm water nearshore group. The average abundance and biomass of zooplankton were 742.25 ind·m^-3 and 131.12 mg·m^-3 respectively; the average diversity index and evenness of zooplankton were 2.54 and 0.67, respectively.