Volume : 3, Issue : 6, June - 2014

Zooplankton Seasonal Abundance in Relation to Physico–Chemical Features in Yelahanka Lake, Bangalore

S. Ramakrishna

Abstract :

Physico–chemical analysis and zooplankton survey of the yelahanka was carried out on monthly basis for the period of one year from April–2013 to March–2014. PH determined alkaline nature of the lake ranging 7.5 to 8.2, Dissolved oxygen was recorded in the range of 3.50 to 4.80 mg/l, while other parameters recorded were alkalinity (180 to 320 mg/l), total Hardness (172 to 290 mg/l), chlorides (110 to 170 mg/l). The nutrients like phosphates and nitrates were at peak in summer and minimum in rainy season. During the study period, total 41 species of zooplankton were identified by four groups such as Rotifera (21 sp), cladocera (6 sp), copepoda (3 sp) and protozoa (11 sp). The highest numbers of zooplanktons were recorded in summer months and lowest in rainy season.