A Note on Zooplankton Distributions at Two Different Types of Water Management Systems in the Muda Rice Agroecosystem

The species composition and abundance of the zooplankton community from two types of irrigation water management system (recycled and uncontrolled flow) in the Muda agro-ecosystem, were studied over two during rice planting seasons during the period of 2002-2003. A total of 25 species of rotifers, 19 species of c1adocerans and 2 species of copepods were identified during the study period. There was not much difference in the number of taxa between the two areas (recycled and uncontrolled flow). Copepods were the most dominant group followed by the rotifers and cladocerans for both plots systems studied, respectively. The most common species recorded from both areas were Simocephalus latirostris and Diaphanosoma sarsi (cladocerans), and followed by Asplanchna pridonta and Platyias patulus (rotifers).