三峡水库香溪河库湾拟多甲藻昼夜垂直分布初步研究  

Preliminary Report on Diel Vertical Distribution Patterns of Peridiniopsis in Xiangxi Bay of the Three Gorges Reservoir

作　　者：徐耀阳[1,2] 蔡庆华[1] 黎道丰[1] 王岚[1,2] 孔令惠[1,2] 余伟[3] 

机构地区：[1]中国科学院水生生物研究所、淡水生态与生物技术国家重点实验室,武汉430072 [2]中国科学院研究生院,北京100049 [3]三峡大学土木水电学院,宜昌443002

出　　处：《武汉植物学研究》2008年第6期608-612,共5页Journal of Wuhan Botanical Research

基　　金：国家自然科学基金资助项目(40671197,30330140);中国科学院知识创新工程重要方向项目(KZCX2-YW-427);国家重点基础研究发展规划(973)项目(2002CB412300)~~

摘　　要：具鞭毛的拟多甲藻(Peridiniopsis)是三峡水库多数支流库湾春季甲藻水华的优势种类。研究表明,昼夜垂直迁移是鞭毛藻重要的生态学特征。拟多甲藻形态学特征虽然也有鞭毛和自由游泳能力,但至今仍没有关于该种类昼夜垂直迁移的描述。定点昼夜垂直分层研究结果表明,三峡水库甲藻水华暴发的优势种之一拟多甲藻种3(Peridiniopsissp.3)是绝对优势种,相对丰度达到45%;该物种与其它鞭毛藻相似,有昼夜垂直迁移的生态学特征,白天趋于在水体上层聚集分布,晚上趋于在水柱中随机分布;太阳光的昼夜交替是影响拟多甲藻昼夜垂直迁移的重要环境因素。The dinoflagellate Peridiniopsis was one of bloom-forming species during the spring period in most bays of Three Gorges Reservoir （TGR）. Account of diel vertical migrations may be of fundamental importance in understanding the ecology of dinoflagellates and explaining their dominance in bloom. The bloom-forming species Peridiniopsis with the characteristic of vegetative cells free-swimming, should exhibit active vertical movements in water column. However, there was no such information in previous literatures. In the present study, diel vertical distribution patterns of phytoplankton were examined from Feb. 26 to 27,2007, when the bloom badly occurred in Xiangxi Bay of the TGR. The dominant species Peridiniopsis sp. 3 accounted for over 45% of total abundance. Patterns of diel vertical distribution were elucidated quantitatively using two different analysis methods. Firstly, mapping method was used to describe the timedepth distribution of phytoplankton individuals and abiotic factors. Secondly, the significant differences of vertical distribution from a state of randomness were tested with Morisita＇s index. For the dominant species Peridiniopsis sp. 3, chlorophyll a and total phytoplankton, the degree of aggregation showed an aggregated distribution in the water upper layer by day and was close to a random distribution in the water column by night. Correlation analysis showed that the diel distribution patterns were affected by photosynthetically available radiation （PAR ,400 -700 nm）. The distribution patterns of phytoplankton and Peridiniopsis were coincident with that of PAR.

关 键 词：三峡水库 春季水华 拟多甲藻 垂直迁移 光合有效辐射 

分 类 号：Q948.11[生物学—植物学]