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Acta Limnologica Brasiliensia
Acta Limnologica Brasiliensia
Original Article

Phytoplankton as bioindicators of water quality in Nasarawa reservoir, Katsina State Nigeria

Fitoplâncton como bioindicadores da qualidade da água do reservatório de Nasarawa, estado de Katsina, Nigéria

Zahraddeen Hassan Yusuf

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Abstract: : Aim: Phytoplankton monitoring as bioindicators to assess the health of the Nasarawa reservoir and also to evaluate the relationship between phytoplankton and reservoir environmental variables.

Methods: Phytoplankton and water samples from Nasarawa reservoir (Nigeria) were collected and analysed for ten months (February, 2018 to November, 2018) using standard methods at five sampling sites.

Results: A total of 38 genera belonging to five major families such as: Bacillariophyceae (42%), Chlorophyceae (24%) Cyanophyceae (13%), Deemidiaceae (18%) and Euglenophyceae (3%) were recorded. Four Phytoplankton classes; Bacillariophyta, Chlorophyta Cyanophyta, and Desmidiaceae show positive close relation with dissolved oxygen, pH, transparency, and total dissolved solids. The overall phytoplankton density in the reservoir was higher in dry season than the wet season. Palmer pollution index was employed to study the water quality of the reservoir. The total score was calculated to be 25, showing evidence of high organic pollution.

Conclusions: The presence of organic pollution indicators Closterium sp, Navicula sp, Nitzschia sp, Synedra sp, Chlamydomonas sp, Cyclotella sp and Anacystis sp is a warning sign of the deteriorating condition of the water quality in the reservoir. Measures need to be enforced to reduce the rate of pollution of the reservoir arising from the human activities in the catchment of the reservoir.


bioindicators, pollution, phytoplankton, Nasarawa Reservoir


Resumo: : Objetivo: Monitoramento do fitoplâncton como bioindicador para avaliar a condição do reservatório de Nasarawa e também avaliar a relação entre o fitoplâncton e as variáveis ​​ambientais do reservatório.

Métodos: Amostras de fitoplâncton e água do reservatório de Nasarawa (Nigéria) foram coletadas e analisadas de forma padronizada durante dez meses (fevereiro de 2018 a novembro de 2018) em cinco locais de amostragem.

Resultados: Foram registrados 38 gêneros pertencentes a cinco principais famílias: Bacillariophyceae (42%), Chlorophyceae (24%) Cyanophyceae (13%), Deemidiaceae (18%) e Euglenophyceae (3%). Quatro classes de fitoplâncton; Bacillariophyta, Chlorophyta Cyanophyta e Desmidiaceae mostram relação positiva com oxigênio dissolvido, pH, transparência e sólidos totais dissolvidos. A densidade total de fitoplâncton no reservatório foi maior na estação seca do que na estação chuvosa. O índice de poluição de Palmer foi empregado para avaliar a qualidade da água do reservatório. A pontuação total foi calculada em 25, mostrando evidências de poluição orgânica elevada.

Conclusões: A presença de indicadores de poluição orgânica Closterium sp, Navicula sp, Nitzschia sp, Synedra sp, Chlamydomonas sp, Cyclotella sp e Anacystis sp é um sinal de alerta para a deterioração das condições da qualidade da água do reservatório. Medidas são necessárias para reduzir a taxa de poluição do reservatório decorrente das atividades humanas na bacia hidrográfica do reservatório.


bioindicadores, poluição, fitoplâncton, reservatório Nasarawa


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