Studies of Zooplanktons of Doma Reservoir, Doma Local Government Area, Nasarawa State, Nigeria

Studies of the zooplanktons of Doma reservoir, Nasarawa State, Nigeria was conducted from March to August, 2017 using plankton net towed horizontally on the surface and lower columns of the water. Zooplankton composition, diversity and relative abundance were determined at six sampling points along the course of Doma reservoir. Microscopic observation and identification of collected samples using appropriate keys was carried ut. Results obtained showed four classes and seventeen genera of zooplanktons, the protozoa constituted the largest group with 363(34.73%) individuals and the least group were the cladocera with 96 (9.46%) individuals, ^planktons diversity indices were determined using Shannon-Weiner diversity index (H) and ranged from 0.453-1.972, species evenness (E) ranged from 0.431-0.926, and Margalefs index of taxa richness (D) ranged from 4.67-6.94. Human activities such as farming, domestic washing, fishing and the physical environmental factors during the study period accounted for the variations in zooplankton taxa observed at the sampling points.