期刊名称：The Open Environmental & Biological Monitoring Journal
电子版ISSN：1875-0400
出版年度：2010
卷号：3
页码：1-11
DOI：10.2174/1875040001003010001
出版社：Bentham Science Publishers Ltd
摘要：
The effect of abattoir wastes and other anthropogenic activities
on the distribution and abundance of zooplankton and environmental
variables were investigated in Orogodo River, southern Nigeria.
Samples of zooplankton were collected for a period of six months
from three stations, representing upstream of the river course,
effluent discharge point and downstream of the river course. A combined
total of 79 species of zooplankton were encountered in the study.
Station 1 recorded the highest number (78 species), station 2 with
22 taxa and station 3 with 72 representative taxa, showing recovery
in terms of diversity and abundance of zooplankton. Rotifers of
the order Bdelloidea dominated all the stations and were relatively
high in station 2 indicating their tolerance to a wide range of
impact. Generally, the cladocerans were abundant at all stations.
However, Moina micrura, and Thermocylops neglectus
were the only members of this group recorded in station 2. The low
fauna diversity experienced in station 2 throughout the period of
sampling showed strong evidence of impact arising from the abattoir
waste discharge and heavy human activities at that station. Local
environmental conditions (i.e. Temperature, flow velocity, depth,
dissolved oxygen, alkalinity and conductivity) accounted for 69%
of variation in zooplankton assemblages using canonical correspondence
analysis (CCA). Seasonal trends in zooplankton community composition
were also related to changes in environmental characteristics of
the river. Our results indicate that the changing water quality
status of the Orogodo River affected the zooplankton diversity and
abundance and such measure could be used as a biomonitoring tool
to determine the ecological health of the river.
