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Seasonal and Spatial Variations of Phytoplankton in Relation to Physico-Chemical Parameters in Adjin Lagoon, Abidjan, Côte d’Ivoire, West Africa

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Journal of Water Resource and Protection 2023年第10期15卷 509-525页

作者： kandana marthe yéo Koffi Komoé Estelle Sévérine Konan Droh Lanciné Goné Ecology Research Center University Nangui Abrogoua Abidjan C&ocircte d’Ivoire Department of Botany University Felix Houphou&eumlt Boigny-Abidjan Abidjan C&ocircte d’Ivoire oceanology Research Center BP V 18 Abidjan C&ocircte d’Ivoire Laboratory of Geosciences and Environment University Nangui Abrogoua Abidjan C&ocircte d’Ivoire

Investigations were carried out on spatial and seasonal composition, distribution and abundance of phytoplankton in Adjin lagoon located in south-eastern of Côte d’Ivoire. Samples were collected at six stations during the four seasons in 2013 year. Freshwater inflow from Bété, Djibi and Mé Rivers influenced the variability of nutrients concentration in this lagoon. From a seasonal point of view, the parameters studied are significantly affected by freshwater inputs during the rainy season. This period is characterized by high values of turbidity, suspended solids and nutrients in the water. overall, 66 taxa from six phyla were recorded. The Chlorophyta had the highest species diversity and Cyanobacteria had the highest relative abundance throughout the year. The temporal distribution of phytoplankton showed that the highest values of density were recorded in the long rainy season and the lowest values in the long dry season. Spatially, the highest abundance (297,927 × 103 cells·L-1) of phytoplankton was found in station 3 and the lowest (74,222 × 103 cells·L-1) in the station 5.

关键词： Adjin Lagoon Distribution Diversity Phytoplankton Nutrients

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Seasonal and Spatial Variations in Water Physicochemical Quality of Coastal Potou Lagoon (Côte d’Ivoire, Western Africa)

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Journal of Water Resource and Protection 2015年第9期7卷 741-748页

作者： yéo kandana marthe Goné Droh Lanciné Kamagaté Bamory Douagui Gountoh Aristide Dembélé Ardjouma Laboratory of Geosciences and Environment University Nangui Abrogoua Abidjan C&#244 te d’Ivoire Laboratory of Agricultural Development University Nangui Abrogoua Abidjan C&#244 te d’Ivoire

The study investigates the seasonal and spatial variations in water quality parameters at four different locations along Potou lagoon for seventeen consecutive months. In order to explore spatial variation among different stations and seasonal changes, no parametric test of ANoVA was used to compare the mean values of the tested parameters for all the different sampling sites and seasons. Seasonal observations on water quality parameters and chlorophyll-a in Potou coastal lagoon revealed that the coastal water was significantly influenced by freshwater during the long and short rainy seasons. The seasonal significant variation (p a increased during the long dry season, whereas, the concentration of nutrients (nitrite, nitrate, ammonium and soluble reactive phosphorus) increased in the rainy periods. Contrary to the seasonal variation, a spatial homogeneity (horizontal) was registered for all variables, a condition related to the low human occupation in the lagoon watershed. Comparing this study with others conducted in Potou lagoon in 2008, no critical differences that evidence alteration in the water quality were found.

关键词： Potou Lagoon Water Quality and Variation

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