Space-time Distribution Characteristics of Zooplankton and Water Quality Assessment in the Fuhe River

To provide a basis for protecting water quality,the population structure of zooplankton was investigated in the Fuhe river in December 2010 and July 2011,and the water quality evaluation was made for the main stream.There were 41 species of zooplankton,in which rotifers were the most.Among the rotifers,a total of 7 families,15 genera and 23 species,accounted for 56.10% of the total;Cladocerans consisted of 5 families,6 genera and 7 species,accounting for 17.07%;Copepods and protozoan accounted for 26.83%.As for temporal distribution,zooplankton abundance in the high water period was greater than in the low water period.The densities of rotifers,cladocerans,copepods and protozoan were 256,26,66 and 16 ind/L respectively,in the high water period,while they were 131,8,24 and 10 ind/L respectively in the low water period.It was found that the density of zooplankton was low at middle section.From the annual average of abundance,rotifers were the highest,and protozoan was the least.From the biomass,copepods were the highest.Biodiversity and water quality assessment showed that the Fuhe river was mildly or moderately polluted.