[ EVALUATION DE L’ETAT TROPHIQUE DES EAUX DU FLEUVE COMOE (COTE D’IVOIRE) A PARTIR DES ANALYSES PHYSICO-CHIMIQUE ET MICRO-ALGALE ]
Volume 41, Issue 4, February 2024, Pages 1286–1297
Mamadou KAMAGATE1, Koffi KOMOE2, and Blé Alexis Tardy Kouassi3
1 Laboratore des Milieux Naturels et Conservation de la Biodiversité, UFR Biosciences, Université Félix Houphouët-Boigny, 22 BP 918 Abidjan 22, Côte d’Ivoire
2 Laboratore des Milieux Naturels et Conservation de la Biodiversité, UFR Biosciences, Université Félix Houphouët-Boigny, 22 BP 918 Abidjan 22, Côte d’Ivoire
3 UFR Sciences biologiques, Université Peleforo Gon Coulibaly, BP 1328 Korhogo, Côte d’Ivoire
Original language: French
Copyright © 2024 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Demographic pressure on watercourses in Côte d’Ivoire is causing increasing degradation of water quality. One of the indicators of water quality is the micro-algal population. The aim of this study is to assess the trophic status of the waters of the Comoé River, based on physico-chemical parameters and micro-algal populations. Four sampling campaigns were carried out from February 2020 to January 2021 at ten selected stations on the river. Abiotic variables were measured in situ and in the laboratory. Microalgae were collected using a plankton net and observed under photonic and electron microscopes for identification. Several indices for assessing the trophic status of the waters were calculated. The study revealed that the waters are relatively warm, rich in nutritive salts and not very transparent. A total of 190 taxa in 79 genera, 39 families, 23 orders, 10 classes and 5 phyla were identified. The Euglenophyceae class, with 58 taxa (30.52%), is the most diverse. The calculated A and B indices range from 6.14 to 7.69 and from 1.14 to 2.23 respectively. The C index fluctuates between 0.20 and 1.18. Nutrient concentration, transparency values and the A, B and C indices indicate that the river’s waters are eutrophic, with more pronounced eutrophy in the middle and lower reaches.
Author Keywords: Microalgae, trophic status, Comoe River, Ivory Coast.
Volume 41, Issue 4, February 2024, Pages 1286–1297
Mamadou KAMAGATE1, Koffi KOMOE2, and Blé Alexis Tardy Kouassi3
1 Laboratore des Milieux Naturels et Conservation de la Biodiversité, UFR Biosciences, Université Félix Houphouët-Boigny, 22 BP 918 Abidjan 22, Côte d’Ivoire
2 Laboratore des Milieux Naturels et Conservation de la Biodiversité, UFR Biosciences, Université Félix Houphouët-Boigny, 22 BP 918 Abidjan 22, Côte d’Ivoire
3 UFR Sciences biologiques, Université Peleforo Gon Coulibaly, BP 1328 Korhogo, Côte d’Ivoire
Original language: French
Copyright © 2024 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Demographic pressure on watercourses in Côte d’Ivoire is causing increasing degradation of water quality. One of the indicators of water quality is the micro-algal population. The aim of this study is to assess the trophic status of the waters of the Comoé River, based on physico-chemical parameters and micro-algal populations. Four sampling campaigns were carried out from February 2020 to January 2021 at ten selected stations on the river. Abiotic variables were measured in situ and in the laboratory. Microalgae were collected using a plankton net and observed under photonic and electron microscopes for identification. Several indices for assessing the trophic status of the waters were calculated. The study revealed that the waters are relatively warm, rich in nutritive salts and not very transparent. A total of 190 taxa in 79 genera, 39 families, 23 orders, 10 classes and 5 phyla were identified. The Euglenophyceae class, with 58 taxa (30.52%), is the most diverse. The calculated A and B indices range from 6.14 to 7.69 and from 1.14 to 2.23 respectively. The C index fluctuates between 0.20 and 1.18. Nutrient concentration, transparency values and the A, B and C indices indicate that the river’s waters are eutrophic, with more pronounced eutrophy in the middle and lower reaches.
Author Keywords: Microalgae, trophic status, Comoe River, Ivory Coast.
Abstract: (french)
La pression démographique sur les cours d’eau en Côte d’Ivoire est à l’origine de la dégradation croissante de la qualité de ces eaux. L’un des indicateurs de la qualité des eaux est le peuplement micro-algal. La présente étude a pour but d’évaluer l’état trophique des eaux du fleuve Comoé à partir des paramètres physico-chimiques et du peuplement de micro-algues. Quatre campagnes d’échantillonnages ont été effectués de février 2020 à janvier 2021 dans dix stations choisies sur le fleuve. Les variables abiotiques ont été mesurées in situ et au laboratoire. Les micro-algues ont été prélevées à l’aide d’un filet à plancton et observées aux microscopes photonique et électronique pour identification. Plusieurs indices d’appréciation de l’état trophique des eaux ont été calculés. L’étude a révélé que les eaux sont relativement chaudes, riches en sels nutritifs et faiblement transparentes. Au total, 190 taxons répartis en 79 genres, 39 familles, 23 ordres, 10 classes et 5 embranchements ont été identifiés. La classe des Euglenophyceae comptant 58 taxons (30,52 %) est la plus diversifiée. Les indices A et B calculés varient respectivement de 6,14 à 7,69 et de 1,14 à 2,23. Quant à l’indice C, il oscille entre 0,20 et 1,18. La concentration en nutriments, les valeurs de la transparence ainsi que les indices A, B et C indiquent que les eaux du fleuve sont eutrophes avec une eutrophie plus accentuée dans les cours moyen et inférieur.
Author Keywords: Micro-algues, état trophique, Fleuve Comoé, Côte d’Ivoire.
How to Cite this Article
Mamadou KAMAGATE, Koffi KOMOE, and Blé Alexis Tardy Kouassi, “ASSESSMENT OF THE TROPHIC STATUS OF THE WATERS OF THE COMOE RIVER (COTE D’IVOIRE) USING PHYSICO-CHEMICAL AND MICRO-ALGAL ANALYSES,” International Journal of Innovation and Applied Studies, vol. 41, no. 4, pp. 1286–1297, February 2024.
