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Diversity of algae species in Xuan Huong lake, Dalat

Diversity of algae species in Xuan Huong lake, Dalat. Xuan huong Lake is considered the heart of Dalat. In this study, algal abundance and diversity in Xua nhuong Lake were studied. Water samples were collected from four different sampling sites from September 2012 to January 2013. | 356 DALAT UNIVERSITY JOURNAL OF SCIENCE Volume 6, Issue 3, 2016 356–363 DIVERSITY OF ALGAE SPECIES IN XUANHUONG LAKE, DALAT Nguyen Thi Thuy Linha*, Le Ha Thua a The Faculty of Biology, Dalat University, Lamdong, Vietnam Article history Received: June 02nd, 2016 Received in revised form (1st): July 02nd, 2016 | Received in revised form (2nd): August 02nd, 2016 Accepted: August 28th, 2016 Abstract Xuanhuong Lake is considered the heart of Dalat. In this study, algal abundance and diversity in Xuanhuong Lake were studied. Water samples were collected from four different sampling sites from September 2012 to January 2013. The identified species were 75 species belonging to 13 orders, 8 classes, 5 phyla (Cyanophyta, Chlorophyta, Bacillatoriophyta, Euglenophyta, Pyrrhophyta). Chlorophyta has the most species with 33 species (44%), the next was Bacillatoriophyta with 18 species (24%), Cyanophyta with 12 species (16%), Euglenophyta with 11 species (15%), and the least was Pyrrophyta: 1 species (1%). There has also been bioindicator species including Euglena viridis, Euglena acus, and Synedra ulna. Therefore, Xuanhuong Lake is considered mesosaprobic Keywords: Bioindicator; Chlorophyta; Diversity; Xuanhuong Lake. 1. INTRODUCTION Xuanhuong Lake is an artificial lake located in the centre of Dalat city, which is closely connected to the history of Dalat city. Xuanhuong Lake has an area of 32 ha and an average depth of 1.5m – 3.5m. It is located on an altitude of 1,478 m above sea level with a capacity of approximately 7.2 million m3. Xuanhuong Lake’s perimeter is around 5 km; it has a crescent shape with many beautiful scenes alongside, such as Cu Hill, Yersin Park, and City Flower Garden. The water quality in the lake depends on the upper reach and watershed. Most of the waste water from tourism, business and agricultural activities is accumulated here. In recent years, there have been several algal blooms in Xuanhuong Lake which have caused harmful influences on .