一种淡水水华硅藻--链状弯壳藻(Achnanthidiu mcatenatum)  

A bloom-forming freshwater diatom: Achnanthidium catenatum

作　　者：马沛明[1] 施练东 赵先富[1] 张俊芳[1] 陈威[1] 胡菊香[1] 

机构地区：[1]水利部中国科学院水工程生态研究所,水利部水工程生态效应与生态修复重点实验室,武汉430079 [2]绍兴市汤浦水库有限公司,上虞312364

出　　处：《湖泊科学》2013年第1期156-162,共7页Journal of Lake Sciences

基　　金：国家自然科学基金项目(51209148);浙江省科技厅项目(2010C33080);绍兴市重点社会发展科研项目(2011A23005)联合资助

摘　　要：作为区域重要饮用水源的浙江绍兴汤浦水库于2010年5月期间暴发以硅藻和蓝藻为主的藻类水华.对库尾、库中和坝前3处浮游植物样品进行采集和分析,结果表明,汤浦水库浮游植物密度在1.13×108～1.56×108cells/L之间,水华优势种之一为我国大陆地区首次报道的羽纹纲硅藻———链状弯壳藻(Achnanthidium catenatum),另一种为丝状蓝藻———湖泊假鱼腥藻(Pseudanabaena limnetica),两者的平均相对丰度分别为65.6%和28.2%;链状弯壳藻是弯壳藻属中唯一适应浮游生长的种类,具有独特的带面观,能以壳面相连形成2～3个细胞的短链状群体;对国内外3次链状弯壳藻为优势种的水华案例进行分析,发现该藻为广温性种类,适应低光强和低磷浓度生长;水华生消机理则需进一步研究.In May 2010, algal bloom dominated by diatom and blue-green algae broke out in Tangpu Reservoir, which is the drink- ing water resource of Shao Xing, Zhejiang Province. Phytoplankton samples collected from 3 sites（ Kuwei, Kuzhong, and Baqian） along the flow direction were investigated. The phytoplankton density ranged between 1. 13 ×10^8 and 1.56 ×10^8 cells/L. The dominant species Achnanthidium cateuatum（ Bily et Marvan） is a pennatae diatom, which was first reported from mainland in Chi- na. Another dominant species Pseudanabaena limnetica belongs to filamentous eyanobacteria, and their average relative abundances were 65.6% and 28.2% , respectively. Achnanthidium catenatum is the only planktonic species of the genus Achnanthidium show- ing distinctive girdle view and colonies consisting of a maximum of 3 frustales. Case studied of three different Achuauthidium care- nature blooms indicated that this species was eurythermal and adapted to lower light intensity and phosphorus concentration, Further study should shed more lights on the formation and disappearance mechanisms of this ＇algal bloom.

关 键 词：硅藻 水华 弯壳藻属 链状弯壳藻 水源地 形态 生态 汤浦水库 

分 类 号：Q948[生物学—植物学]