Study On The Dinoflagellate Bloom In The Three Gorges Reservoir And The Donghu Lake, Wuhan

The Yangtze River is the biggest river in China. The Three Gorges Project is the backbone project for developing and harnessing of the Yangtze River; it will exert far-reaching and profound impacts on the environment after sluice, which has brought ecological and environmental concerns. After the reservoir impoundment, flow velocity would be decreased and aquatic capability would be aggrandized, the aqua-environmental conditions would be changed and the pollution degree would be greater than that before building the dam, which can arose the rapid reproduction of phytoplankton, finally leads to blooming.The paper investigated algal bloom in the Three Gorges Reservoir. Sampling sites included tributary bays (Xiangxi River, Tongzhuang River, Yuanshui River, Jiuwan Brook, Gaolan River) and four non-tribuary bays. We found the blooming phytoplankton are belonged to dinoflagellate,diatom,green microalgae and Cryptophyta.In non-tribuary bays, Peridiniopsis sp. and Asternella sp. made up of the preponderant organism in April 2005 in CJ1.Peridiniopsis sp. bloom occurred firstly in the end of Feb. 2005 in the low-relaxed region of Xiangxi River and then extended the whole bay. In April, Asternella sp. and Cyclotella sp. became preponderant organism.Gaolan River is a tributary of Xiangxi River, in which Peridiniopsis sp. bloom appeared in Feb. 2005 and lasted about one month.At the beginning of March, Peridiniopsis sp. bloomed firstly in the upriver of Yuanshui River and gradually developed for downriver region.In Tongzhuang River, Peridiniopsis sp. bloom occurred at the beginning of Mar. and lasted about two months. The concentration of chl a. was often more than...