Document Type : Primary Research paper
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, 410001 Nigeria ORCID: https://orcid.org/0000-0002-6205-4886 Biofuels Institute, School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013 China Bioconservation Unit, Department of Zoology, Nnamdi Azikiwe University, Awka Nigeria
Department of Zoology and Environmental Biology, University of Nigeria, Nsukka, 410001 Nigeria
Bioconservation Unit, Department of Zoology, Nnamdi Azikiwe University, Awka Nigeria
The study evaluated the physicochemical properties and macroinvertebrates abundance of the Iyi-agu stream located at Ozzi-Edem Nsukka, Southeastern Nigeria. Samples were collected fortnightly at three sampling points: upstream, midstream, and downstream from June to August 2019 for physicochemical analysis and macro-invertebrate studies. The monthly variations of macroinvertebrates and physicochemical properties were analyzed using descriptive statistics and correlation matrices. Three species of macroinvertebrates: Hirudo medicinalis, Nsukkadrillus mbae, and Anopheles gambiae were recorded. Hirudo medicinalis showed a weak correlation with nitrate (r = 0.424, p = 0.028) while Anopheles gambiae correlated strongly with nitrate (r = 0.644, p = 0.0001) and depth (r = 0.687, p = 0.0001) respectively. Nitrate and depth were the major factors that influenced the abundance of macroinvertebrates. The macroinvertebrate abundance was a good biological indicator of the water quality of the Iyi-agu stream. Therefore, macroinvertebrates are a suitable option that should be considered in biological assessments of water bodies.