Impact of Rainfall and Some Water Abiotic Factors on the Abundance Dynamic of Vibrio and Aeromonas Adhered to Copepods Surface in Some Coastal Streams and Rivers in Cameroon (Central Africa) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Research Studies in Biosciences Année : 2015

Impact of Rainfall and Some Water Abiotic Factors on the Abundance Dynamic of Vibrio and Aeromonas Adhered to Copepods Surface in Some Coastal Streams and Rivers in Cameroon (Central Africa)

Résumé

A study was carried out on the tributaries draining into Rivers in the coastal region of Cameroon (Central Africa). It aimed at assessing the abundance of Vibrio and Aeromonas cells adhered to copepods with respect to some considered abiotic factors. It has been noted that the tributaries are substantially concentrated in organic matter and these fluctuated, depending on the amount of rainfall received by the rivers throughout the period of the study. The abundance of Aeromonas cells adhered to copepod fraction ranged from 38 CFU.Ind-1 to 8×103 CFU.Ind-1 . That of Vibrio cells ranged from 75×102 CFU.Ind-1 to 42.4×103 CFU.Ind-1 . Of the total bacteria identified in this study, V. cholerae relatively dominated the bacterial community (38%), followed by A. sobria (30%), A. hydrophila (27%) and other species namely V. alginoticus, V. parahaemolyticus, V. mimicus, V. vulnificus, A. cavia, Aeromonas sp. represented 5%. From the Principal Component Analysis (PCA) assessing the influence of abiotic factors in the abundance changes of bacteria attached to copepods, it appears that the first cloud of points includes the rainfall, pH, Aeromonas and Vibrio while the second cloud on the left pole groups namely water temperature, salinity, carbon dioxide and oxydability. Vibrio and Aeromonas cells preferentially colonized copious quantities of copepods during the period of excess flood when the concentration of nutrients in the water column regressed. A complex network of abiotic factors thus acts in synergy to influence the attachment of Aeromonas and Vibrio cells to copepods. To prevent the risk of cholera outbreaks and non-cholera infections, ecological monitoring should be further enhanced during the period of excess rainfall.
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Dates et versions

hal-01392567 , version 1 (09-11-2016)

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Licence Ouverte - etalab

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  • HAL Id : hal-01392567 , version 1

Citer

E. Koji, A. Tamsa Arfao, C. Lontsi Djimeli, O.V. Noah Ewoti, M.E. Nougang, et al.. Impact of Rainfall and Some Water Abiotic Factors on the Abundance Dynamic of Vibrio and Aeromonas Adhered to Copepods Surface in Some Coastal Streams and Rivers in Cameroon (Central Africa). International Journal of Research Studies in Biosciences, 2015, 3 (9), pp.11-21. ⟨hal-01392567⟩
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