A survey of zooplankton diversity of Challawa river, Kano and evaluation of some of its physico-chemical conditions

摘要: Between July 2006 and December 2007 changes in some physico-chemical biological conditions of Challawa River were assessed by collecting water samples from it, except for temperature, pH Secchi disc transparency that measured situ, at four selected sites on fortnight basis between 8:00 – 10:00a.m.. The results revealed the minimum maximum pH, electrical conductivity, secchi transparency, dissolved oxygen, biochemical oxygen demand zooplankton densities 15.5-31.5oC, 3.67-8.69, 44.0-4865.0μScm¯1, 0.04- 0.149M, 0.20-9.15mg/L, 1.30-19.80mg/L 0.00-45.30Org/L respectively. Significant differences occurred wet dry season values (P 0.01 conductivity. However, no significant difference was found between seasons terms distribution (P>0.05). Zooplankton density found to correlate positively with among others. Eighteen (18) species identified include protozoa, 5 (22.78%); insecta 2(11.11%); copepoda, 5(27.78%); cladocera, 1(5.55%); rotifera, 5(27.78%). first two before above off stream had higher diversity appeared be unpolluted. Although river generally low diversity, perhaps due other factors limit phytoplankton growth, discharge untreated effluent into could said cause pollution a localized state inflow site. It recommended appropriate authorities should ensure neighboring industries comply emission standards set out government view minimizing negative effects their actions both humans aquatic biodiversity river. Similarly, it there continual monitoring status river, which appears neglected concerned present so can take place situation go hand. Key words: Physico-chemical, zooplankton, season, River, Kano