Diversidad de floraciones de especies de algas nocivas en el área central del estuario del Río Bonny, delta del Níger, Nigeria
DOI:
https://doi.org/10.47193/mafis.3532022010908Palabras clave:
Distribución, estación, abundancia, HAS, gradientes ambientalesResumen
Este estudio se llevó a cabo entre diciembre de 2018 y noviembre de 2019 para examinar la distribución y abundancia de especies de algas nocivas (HAS, por sus siglas en inglés) en el área central del estuario del río Bonny. Se establecieron siete estaciones de muestreo con la herramienta ArcGIS. Las especies de microalgas se muestrearon con una red de plancton de 20 mm de malla. Los nutrientes se analizaron en laboratorio mediante el Método APHA 4500, mientras que las características fisicoquímicas se determinaron in situ. Los resultados revelaron que los gradientes ambientales fueron adecuados para sustentar la vida en esa parte del estuario, excepto por el fosfato (2,90 ± 0,22 - 9,48 ± 1,06 mg l-1). Se determinaron un total de 31 HAS categorizadas en 17 géneros y tres clases: Bacillariophyceae (29 especies), Chlorophyceae y Cyanophyceae (una especie cada una). Navicula amphibola tuvo la mayor densidad (4,713 x 103 células l-1) mientras que Pinnularia divergens registró la menor densidad (0,00049 x 103 células l-1). Los valores de densidad total disminuyeron a través de las estaciones con 9,157 x 103 células l-1 en la estación seca y 8,907 x 103 células l-1 en la estación húmeda. La lista de especies en las estaciones mostró que cinco especies se distribuyeron en las siete estaciones, mientras que dos se encontraron solo en las estaciones 2 y 7. Los índices de diversidad revelaron que el índice de Shannon osciló entre 3,17 y 3,25 y la uniformidad de las especies osciló entre 0,78 y 0,88, mientras que el valor del rango de Margalef (3,09-3,31) se consideró moderadamente estable. Por lo tanto, existe la necesidad de prácticas de gestión adecuadas que podrían ayudar a reducir el nivel de descarga de nutrientes en el área central del estuario del Bonny.
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Henry E. Dienye, Department of Fisheries, Faculty of Agriculture, University of Port Harcourt, East/West Road, PMB 5323 - Choba, Nigeria
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