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Title: Assessment of Water Quality Using Benthic Macroinvertebrates and Selected Physicochemical Parameters: A Case Study of Bubi- Lupane Dam, Zimbabwe.
Authors: Mpofu, Andile, Kwanele
Keywords: water quality
benthic macroinvertebrates
physico-chemical parameters
Issue Date: Jun-2018
Publisher: Lupane State University
Abstract: Assessment of water quality using benthic macroinvertebrates in Zimbabwe is still in its infancy. Water quality of Bubi-Lupane Dam was assessed using benthic macroinvertebrates and selected physico-chemical parameters. South African Scoring System 5 was used to assess Ecosystem health of the Dam. Composite samples of benthic macroinvertebrates and physico-chemical parameters were collected twice both in dry and wet season on thirty sampling points. Benthic macroinvertebrates were identified using standard classification keys, pH, conductivity, phosphates and turbidity were determined using standard methods. 2144 benthic macroinvertebrates were collected belonging to 9 orders and 17 families. The most abundant taxa order were Ephermoptera (33.14%) and Coleoptera (21.35%). The least abundant taxa were Diptera (0.09%). The most abundant benthic macroinvertebrates were Ephermeridae (33.14%) and Nononemouride (21.13%). The least abundant benthic macroinvertebrates were Oligachaeta (0.05%). The SASS 5 score of Bubi-Lupane Dam was 110 and the ASPT score was 6.875 indicating good water quality. Mini Tab 16 was used to conduct one way (ANOVA) AND Paired t-test for physico-chemical parameters, diversity, abundance, richness and evenness. The mean values of physico-chemical parameters were as follows, pH (7.45), electrical conductivity (18.13uS/m) and turbidity (0.025NTU). All the physico-chemical parameters registered mean values below the blue category as classified under the Statutory Instrument 6 of 2007 Environment Management (Effluent and Solid Waste Disposal) Regulations, indicating good water quality. Relevant authorities should monitor the Dam regularly. Benthic macroinvertebrates and their indices can be used to assess water quality in Zimbabwe. This study demonstrates the capacity of benthic macroinvertebrates use in water quality testing.
Appears in Collections:Department of Crop and Soil Science

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