~ 872 ~ Journal of Entomology and Zoology Studies 2020; 8(2): 872-878 E-ISSN: 2320-7078 P-ISSN: 2349-6800 www.entomoljournal.com JEZS 2020; 8(2): 872-878 © 2020 JEZS Received: 25-01-2020 Accepted: 26-02-2020 Idowu EO Department of Zoology and Environmental Biology, Ekiti State University, Ado Ekiti, Nigeria Edward JB Department of Zoology and Environmental Biology, Ekiti State University, Ado Ekiti, Nigeria Adewumi AA Department of Zoology and Environmental Biology, Ekiti State University, Ado Ekiti, Nigeria Oyeniran BH Department of Zoology and Environmental Biology, Ekiti State University, Ado Ekiti, Nigeria Corresponding Author: Oyeniran BH Department of Zoology and Environmental Biology, Ekiti State University, Ado Ekiti, Nigeria Physico-chemical parameters and macro benthos of Ogbese river, Ado-Ekiti, Ekiti State, Nigeria Idowu EO, Edward JB, Adewumi AA and Oyeniran BH Abstract Benthic macro-invertebrates and some physico-chemical parameters samples were taken for three months from July to September 2017 with the aim to evaluate macro-invertebrate fauna and water quality of Ogbese River, along polytechnic Road Ado-Ekiti. A total number of 11 benthic macro-invertebrates taxa were found and were recorded based on their Phylum classification. The macro-benthos obtained from River Ogbese comprised mainly of two phyla namely Mollusca represented by 8 species; Hydrobia guyenori, Saulea vitreas, Assimina heisei, Pila weiner, Lanotes libycus, Bellamya unicollar, Soapitic dageti and Afropomus balanoid. The other phylum was represented by Tipula sp., Arenicolar sp. and Chironomus sp. The result of the physico-chemical parameters at different sample stations for each Month showed the variation between the benthic organisms and water parameters as significant factors for biological indicator of Ogbese River. Statistical analysis of the result showed that there was significant relationships between some of the physico-chemical parameters including temperature, alkalinity, transparency, free carbon-dioxide, conductivity, pH, total dissolved solid, dissolve oxygen and conductivity of the River. The water quality was determined as moderately polluted. Obtained environmental variables from water samples showed that the temperature, dissolved oxygen, pH, total dissolved solids and electrical conductivity were the most important parameters in explaining the macro- invertebrates community variation in Ogbese River. Keywords: Macro-benthose, bio-indicator, water quality and species diversity 1. Introduction Benthic macro-invertebrates fauna are those organisms that live on or inside the deposit at the bottom of a water body (Idowu and Ugwumba, 2005) [17] . Macro - invertebrates are considered historically by definition to be visible to the unaided eye and retained on a U.S standard No 30 sieve 0.595mm or 0.600mm openings (Danes and Hynes, 1980) [5] . The benthic species diversity is controlled by productivity, habitat heterogeneity and biotic interactions (Mc Carthy, 2002) [25] . These organisms play a vital role in the circulation and recirculation of nutrients in aquatic environments. They constitute the link between the unavailable nutrients in detritus and useful protein materials in fish. Macro benthic invertebrate are biological quality element require for the classification of biological status of the water bodies (Imevbore et al., 1967) [18] . According to Danes and Hynes (1980) [5] , occurrence and distribution of macro- invertebrate are governed mostly by the physical and chemical quality of water and immediate substrate of occupation. Macro-invertebrates play an important role in aquatic community which includes mineralization, mixing of sediments and flux of oxygen into sediment, cycling of organic matter and also in assessing the quality of inland water (George et al., 2009) [8] . The distribution of macro invertebrate fauna is determined by a number of factors such as the physical nature of the substratum, depth, nutritive content, degree of stability and oxygen content of the water body. Macro-invertebrate organisms are threatened by changes in their habitat which are associated with pollution, erosion and siltation (Lydeard et al., 2004) [10] . The use of macro-invertebrate diversity for bio-assessment provides a simpler approach and this is due to the fact that they can be sampled quantitatively as well as the known relative sensitivity or tolerance of some of them to contamination (Adakole and Annune, 2003) [1] . Biological assessments are being developed worldwide to evaluate changes in genetic composition of specific populations, bioaccumulation of toxins and related occurrence of morphological deformities through the occurrence of macro-invertebrates in a water column. Invertebrates have an irregular distribution which is assumed to be related with interchanging conditions in the substratum, flow conditions and depth.