Abstract— This study aimed to assess the water quality of Ono lagoon using macroinvertebrates as bioindicators. The Biological Monitoring Working Party (BMWP) scoring system and the Pollution Tolerance Index (PTI) were used to assess the ecosystem health of water. Samples were monthly collected from September 2015 to August 2016. A total of 12145 macroinvertebrates belonging to 47 families, 17 orders, 5 classes and 3 phyla were identified. Macroinvertebrates were mainly composed of Arthropoda, Mollusca and Annelida. The most abundant taxa was Insecta (83.14%) followed by Gastropoda (6.65%) and whereas the least abundant taxa were Achaeta (6.19%), Crustacea (2.39%) and Arachnida (1.62%). The BMWP score was 140, indicating that water was neither very clean nor significantly altered aquatic habitat. According to the PTI, the water was moderately polluted based on the number of moderately pollution-sensitive organisms (52.96%) and the number of aquatic organisms which are fairly and very sensitive to pollution (34.6%). These results showed that biological quality of Ono lagoon can be considered as acceptable.
Keywords— BMWP scoring system, Macroinvertebrates, Ono Lagoon, Pollution Tolerance Index, Water quality.
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