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

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, NO 3 − , and PO 4 3− 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. PO 4 3− 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.

Spatial and temporal variations of physical-chemical parameters of the Akor River in Ikwuano local government of Abia state, Nigeria

“…The NO 3 values observed in the present study were low compared to results of some studies in Nigerian rivers (Igbinosa et al, 2012;Yusuf et al, 2017;Amah-Jerry et al, 2017;Anyanwu and Emeka, 2019). However, NO 3 values recorded during this study were within or little below the results of Anyanwu and Ukaegbu (2019) and Kindele and Olutona (2014), both obtained in Nigeria.…”

Concentrations of Polybrominated Diphenyl Ethers (PBDEs) in Water from Asunle Stream, Ile-Ife, Nigeria

“…Small streams may carry clear water for most parts of the year whereas, during the rainy season, the water may carry a moderate amount of dirt, organic debris, and suspended materials [ 5 ]. As streams move close to inhabited or dumpsite areas, water quality can undergo various forms and levels of deterioration capable of eroding the availability of water for humans and ecosystems and even decrease species diversity within a given ecosystem [ 6 ].…”

Spatio-Temporal Assessment of Zooplankton Fauna of Uta Ewa Estuary, Akwa Ibom State, Nigeria.

“…Station 2 (2.975) had value that is higher than Ajuonu et al (2011) But lower than Abdul et al (2016) attributable to the effect observed in Shannon-Weiner indices. Akindele and Olutona (2014) also recorded Margalef indices values of between 1 and 3; which also attributed to environmental pollution and instability. Margalef index has no upper limit but most of the diversity indices give high values to stable communities and low values to unstable ones; thereby revealing environment variability attributed to environmental degradation (Mason 2002;Yeom and Kim, 2011;Shah and Pandit, 2013).…”

“…This observation could be attributed to the effect of anthropogenic activities exacerbated by season. Akindele and Olutona (2014) recorded Shannon-Weiner indices values of <3.0, which was attributed to polluted and unstable environment. Bonny Estuary is the home to the Nigeria Liquified Natural Gas Project, which could seriously impact on the environment.…”