Ecological characteristics and environmental factors of phytoplankton during different seasons and in different parts of Taihu Lake
Wang, Peifang; Wang, Yingxue; Wang, Chao; Qian, Jin; Hou, Jun
published: Sep 1, 2015
ArtNo. ESP141018701005, Price: 29.00 €
Eutrophication and cyanobacterial blooms have become the most severe problems affecting the water body function of Taihu Lake. In order to understand the distribution of phytoplankton and their co-relationship with environmental factors, the phytoplankton and environmental factors were observed in different parts of Taihu Lake in the summer (July) and winter (December) of 2013. By using diversity indexes and a redundancy analysis (RDA), this study revealed that Cyanophyta, Chlorophyta and Bacillariophyta were the majority, and the main impact factors were total phosphorus (TP), total nitrogen (TN), phosphate (PO4 3–-P), ammonia nitrogen (NH4 +-N) and dissolved oxygen (DO). During the summer, the Microcystis of Cyanophyta were the most prevalent. However, during the winter, the prevalence of all of the species and the abundance of algae decreased greatly and Bacillariophyta became dominant. The northwestern, algae-type portion of the lake had the highest abundance of Microcystis, which suffered serious eutrophication. In contrast, the eastern, grass-type portion of the lake had the lowest abundance of algae but the highest content of Bacillariophyta, indicating superior water quality. Based on the above analysis, suggestions were given to prevent and control algal blooms. In addition to decreasing the input of exogenous nutrients, sediment dredging may be performed in the northwestern portion during the winter to eliminate the blue green algae in the resting stage to some extent. Meanwhile, macrophytes should also be reconstructed in northern bays to restrain the rampant growth of phytoplankton.