中文摘要：

为了更好地了解珊瑚礁区生物群落应对环境变化的生态响应机制,以及浮游生物群落结构与珊瑚礁发展发育的关系,我们于2006年10月26日至11月10日对三亚珊瑚礁保护区9个有珊瑚礁分布的站点进行了浮游生物群落结构的调查。共鉴定出浮游植物种类61属130种（包括变种、变型）,其中硅藻门48属101种,甲藻门10属25种,蓝藻门2属3种,金藻门1属1种。硅藻门的角毛藻属（Chaetoceros）种类最多,根管藻属（Rhizosolenia）的种类次之。调查海区浮游植物的细胞丰度范围为348–11,320个/L,平均为3,247个/L。在浮游植物群落中硅藻占绝对优势,平均丰度为3,230个/L,占总密度的99.5%。调查海区共鉴定出浮游动物76种,其中桡足类29种,水母类17种,浮游幼虫10种,毛颚类7种,被囊类6种,浮游腹足类4种,十足类、多毛类和介形类各1种。调查海区浮游动物的密度范围为43–190个/m3,平均为114个/m3。优势类群为桡足类、各类幼虫和毛颚类,平均分别占浮游动物总密度的28.5%,27.7%和13.6%。各站位浮游植物的多样性指数和均匀度平均分别为3.98和0.70,浮游动物的多样性指数和均匀度平均分别为4.37和0.87。鹿回头和大东海海域的浮游植物密度大,而生物多样性指数低。活的造礁石珊瑚种数和覆盖率高的站点的浮游生物多样性也较高。

英文摘要：

To better understand mechanisms of plankton community response to environmental change,the plankton community structure and diversity were investigated at nine stations near Sanya city between Octo-ber 26 and September 10,2006.A total of 130 phytoplankton taxa belonging to 61 genera and 4 classes,76 zooplankton species belonging to 9 groups,were identified in the present study.Among the phytoplankton,101 species in 48 genera belonged to Bacillariophyta,25 species in 10 genera belonged to Pyrrophyta,3 spe-cies in 2 genera belonged to Cyanophyta,and 1 species belonged to Chrysophyta.The genus Chaetoceros had most abundant species,followed by Rhizosolenia.Density of phytoplankton ranged between 348–11,320 cell/L（average 3,247 cell/L） at the nine stations.Bacillariophyta dominated phytoplankton assemblages with an average of 3,230 cell/L,comprising 99.5% of the total phytoplankton abundance.As for zooplankton,spe-cies of Copepods were most abundant（29）,followed by Medusae（17）,Pelagic larvae（10）,Chaetognaths（7）,Tunicata（6）,Gastropoda（4）,Decapoda（1）,Polychaeta（1） and Ostracoda（1）.The first three were the domi-nant groups,contributing 28.5%,27.7% and 13.6% of total zooplankton density,respectively.The density of zooplankton was 43–190 ind./m3（average 114 ind./m3）.The Shannon-Wiener diversity index and Pielou＇s evenness index were 3.98 and 0.70 for the phytoplankton community,and 4.37 and 0.87 for the zooplankton community,respectively.Among nine stations,Luhuitou and Dadonghai had high density but low species diversity of phytoplankton.There were more species of reef-building corals and higher live coral coverage in the stations with higher plankton diversity.