Table of Contents
Journal of Ecosystems
Volume 2014, Article ID 105405, 11 pages
http://dx.doi.org/10.1155/2014/105405
Research Article

Water Physicochemistry and Zooplankton Fauna of Aiba Reservoir Headwater Streams, Iwo, Nigeria

1Department of Biological Sciences, Bowen University, PMB 284, Iwo, Osun State, Nigeria
2Department of Biological Sciences, Federal University Ndufu-Alike Ikwo, PMB 1010, Abakaliki, Ebonyi State, Nigeria
3Department of Chemistry and Industrial Chemistry, Bowen University, PMB 284, Iwo, Osun State, Nigeria

Received 22 May 2014; Revised 17 October 2014; Accepted 22 October 2014; Published 19 November 2014

Academic Editor: Wen-Cheng Liu

Copyright © 2014 Emmanuel O. Akindele and Godwin O. Olutona. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The physicochemical water condition and zooplankton fauna of the two main inflows of Aiba Reservoir were assessed over an annual hydrological cycle (May 2013–March 2014). The concentrations of total solids (TS) and total suspended solids (TSS) in the two streams were unusually higher in the dry season for typical inland waters of Nigeria and showed a decrease from the upper reaches towards the lower reaches (reservoir’s inlet). Dissolved oxygen, , and recorded their highest concentrations at the reservoir’s inlet. A total of 37 species of zooplankton were recorded in the study, comprising 5 species of Protozoa, 14 species of Rotifera, 10 species of Copepoda, 4 species of Ostracoda, and 4 species of Insecta. Aiba stream recorded higher number of zooplankton species and abundance than Onikan stream. While number of zooplankton species and abundance showed an increase from the upper reaches to the lower reaches of both streams, species diversity and equitability generally showed a decrease. Correlation and regression analysis suggests that the concentration of TS and TSS played a major role in determining the zooplankton community structure of the streams. concentrations as well as the community structures of zooplankton faunas of the two streams were indicative of a polluted freshwater system with unstable habitat structure.