Study of algal flora in autumn and winter in Yueya Lake in Nanjing City

Algal communities in Yueya Lake in Nanjing City were investigated during the period from October 2012 to January 2013.More than 160 samples of aquatic algae were collected from six typical sampling sites,and these samples were observed,identified,and statistically analyzed,in order to study the floral compositions and temporal and spatial distributions of algae in the lake.The results show that there are 57 taxa of algae belonging to eight divisions,29 families,and 57 genera,and they are mostly composed of Cyanophyta,Bacillariophyta,and Chlorophyta( accounting for 47.37% of the total).There are twelve dominant taxa of algae in the lake and six of them are bloom species.The algae have the highest species abundance and the highest density in October.As the temperature declines,the species abundance and density begin to decrease.Analysis of the distribution patterns of the algae and pollution-indicating algae in the lake shows that the waters of the Yueya Lake have been polluted to a certain extent.