Autecology of microalgae in Nsit Ubium river

Analysis of water such as river and lakes can provide an insight into their composition potential impact on the environment. Nsit Ubium River is a fresh body that flows through urban areas in Akwa Ibom state. The locals attached lot socio-economic importance to river, result this humans generated pollutants find way it. Researching autecology microalgae algae sample were collected from for period four months (October 2021 January 2022) analyzed physiochemical parameters species diversity using standard procedures. Water samples 1 litre transparent bottle while by scrapping plants bank preserved with drop mixture formaldehyde lugol iodine. pH ranged between (4.1 5.8), conductivity (15 153), alkalinity (5.0 Nitrate (0.5 0.80Mg/L), phosphate (5.01 7.8Mg/L) dissolve oxygen (6.27 9.22mg/l) determined. Five divisions comprising 92 taxa identified during study. division, Bacillariophyta was most represented division accounting 80% occurrence total 72 species, followed Chlorophyta 10%, Euglenophyta (7%), Cyanophyta (2%) which accounted 9, 6 2 respectively. Dinophyta least (1%) contributed only one taxon. month November has highest number 54 December (31 taxa). dominated diatoms (Bacillariophyta) are good pollution bio-indicators. indicates higher nutrient enrichment could have been due runoff agricultural land or waste discharge. Therefore, documented be usedful pollutant indicator assessing status rivers.