Composition of the Phytoplankton Population of the Ouladine Lagoon South of the City of Grand-Bassam
Composition of the Phytoplankton Population of the Ouladine Lagoon South of the City of Grand-Bassam
Koffi Komoe1, N’Guessan Roméo Lozo1*, Estelle Sévérine Konan2
ABSTRACT
The Ouladine lagoon of Grand-Bassam is subject to a number of pressures due to urbanisation, particularly sand extraction, which is damaging its biodiversity. The aim of this study is to contribute to our knowledge of phytoplankton in the Ouladine lagoon. For this purpose, phytoplankton samples were collected using a 20 µm mesh plankton net during the period from January to June 2017 at three stations (named as ST1, ST2 and ST3). An Olympus CKX 41 photonic microscope equipped with a digital camera was used to observe and photograph various phytoplankton taxa. These observations enabled 76 taxa to be inventoried, divided into four phyla. The phytoplankton distribution revealed a dominance of Heterokontophyta with 36 taxa or 47.4%, followed by Cyanoprokaryota (20 taxa or 26.3%), Chlorophyta (13 taxa or 17.1%) and finally 07 Euglenophyta, or 9.2%. Out of 76 taxa, 07 are reported for the first time in Côte d’Ivoire and are therefore new to the country. We have observed and concluded that the distribution of algal species in the Ouladine lagoon is influenced by pH, turbidity, dissolved oxygen, orthophosphate and nitrate levels.
Keywords | Phytoplankton, Physico-chemical parameters, Ouladine lagoon, Grand-bassam, Côte d’Ivoire
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