Organic and bacterial pollution in the Ebrié lagoon, côte d'Ivoire

Adingra, A.A.; Arfi, Robert

doi:10.1016/s0025-326x(98)00033-2

Cited by 20 publications

(16 citation statements)

References 5 publications

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“…The density of the riparian population is variable ranging from 3.5 inhabitants km -2 around the Aby lagoon system to *100 inhabitants km -2 around the Ebrié lagoon system (Jallow et al 1999). Hence, the Grand-Lahou and Aby lagoon systems are relatively pristine, while the Ebrié lagoon system is strongly polluted by domestic and industrial waste water inputs (Kouassi et al 1995;Adingra and Arfi 1998). The waters around Abidjan are highly eutrophicated leading to frequent oxygen depletion, and massive fish kills and repelling sulphuric smells (Kouassi et al 1995;Scheren et al 2004), and have been included in the recent compilation of coastal ''dead zones '' (Diaz and Rosenberg 2008 (Comoé, Bia and Tanoé).…”

Section: Description Of Study Areamentioning

confidence: 99%

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

et al. 2010

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We report a data-set of dissolved methane (CH 4 ) in three rivers (Comoé, Bia and Tanoé) and five lagoons (Grand-Lahou, Ebrié, Potou, Aby and Tendo) of Ivory Coast (West Africa), during the four main climatic seasons (high dry season, high rainy season, low dry season and low rainy season). The surface waters of the three rivers were over-saturated in CH 4 with respect to atmospheric equilibrium (2221-38719%), and the seasonal variability of CH 4 seemed to be largely controlled by dilution during the flooding period. The strong correlation of CH 4 concentrations with the partial pressure of CO 2 (pCO 2 ) and dissolved silicate (DSi) confirm the dominance of a continental sources (from soils) for both CO 2 and CH 4 in these rivers. Diffusive air-water CH 4 fluxes ranged between 25 and 1187 lmol m -2 day -1 , and annual integrated values were 288 ± 107, 155 ± 38, and 241 ± 91 lmol m -2 day -1 in the Comoé, Bia and Tanoé rivers, respectively. In the five lagoons, surface waters were also over-saturated in CH 4 (ranging from 1496 to 51843%). Diffusive air-water CH 4 fluxes ranged between 20 and 2403 lmol m -2 day -1 , and annual integrated values were 78 ± 34, 338 ± 217, 227 ± 79, 330 ± 153 and 326 ± 181 lmol m -2 day -1 in the Grand-Lahou, Ebrié, Potou, Aby and Tendo lagoons, respectively. The largest CH 4 oversaturations were observed in the Tendo and Aby lagoons that are permanently stratified systems (unlike the other three lagoons), leading to anoxic bottom waters favorable for a large CH 4 production. In addition, these two stratified lagoons showed low pCO 2 values due to high primary production, which suggests an efficient transfer of organic matter across the pycnocline. As a result, the stratified Tendo and Aby lagoons were respectively, a low source of CO 2 to the atmosphere and a sink of atmospheric CO 2 while the other three well-mixed lagoons were strong sources of CO 2 to the atmosphere but less oversaturated in CH 4 .

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Section: Description Of Study Areamentioning

confidence: 99%

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

et al. 2010

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“…The Ebrié lagoon system ( Fig. 1) is the largest lagoon in West Africa (Adingra and Arfi 1998). It is an elongated lagoon system with a total area of 566 km 2 , and it stretches for ∼130 km, with a maximum width of ∼7 km.…”

Section: Description Of Study Areamentioning

confidence: 99%

Seasonal Variability of Carbon Dioxide in the Rivers and Lagoons of Ivory Coast (West Africa)

Koné

Abril

Kouadio

et al. 2008

Estuaries and Coasts

108

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We report partial pressure of CO 2 (pCO 2 ) and ancillary data in three rivers (Bia, Tanoé, and Comoé) and five lagoons (Tendo, Aby, Ebrié, Potou, and Grand-Lahou) in Ivory Coast (West Africa), during four cruises covering the main climatic seasons. The three rivers were oversaturated in CO 2 with respect to atmospheric equilibrium, and the seasonal variability of pCO 2 was due to dilution during the flooding period. Surface waters of the Potou, Ebrié, and Grand-Lahou lagoons were oversaturated in CO 2 during all seasons. These lagoons behaved similarly to the oligohaline regions of macrotidal estuaries that are CO 2 sources to the atmosphere due to net ecosystem heterotrophy and inputs of riverine CO 2 rich waters. The Aby and Tendo lagoons were undersaturated in CO 2 with respect to the atmosphere because of their permanent haline stratification (unlike the other lagoons) that seemed to lead to higher phytoplankton production and export of organic carbon below the pycnocline.

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“…Other uses of the lagoon include sand extraction, aquaculture, recreation, and transportation. Abidjan, with an estimated population of over four million, is an example of the many developing world cities, where unplanned development has resulted in rapid urbanization and large-scale industrialization, without consideration of environmental concerns (Adingra and Arfi 1998).…”

Section: Study Areamentioning

confidence: 99%

“…Several studies have reviewed the dramatically deteriorating quality of the Ebrié lagoon waters in terms of the sources of pollution (Kouassi et al 1995;Adingra and Arfi 1998). Others have studied the effects in terms of sediment contamination (Kouadio and Trefry 1987), effects on marine life (Ecoutin et al 2005), hydrodynamics modelling (Brenon et al 2004), and integrated water pollution assessment (Scheren et al 2004).…”

Section: Study Areamentioning

confidence: 99%

Heavy metal and polycyclic aromatic hydrocarbons in Ebrié lagoon sediments, Côte d’Ivoire

Affian

Robin

Maanan

et al. 2008

Environ Monit Assess

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Surface sediments throughout Ebrié lagoon, Côte d'Ivoire were collected in 2001 and analyzed for their heavy metal and polycyclic aromatic hydrocarbons (PAH) contaminant content. Geochemical maps of heavy metals (Cd, Cu, Zn, Fe, and Mn) in the surface sediment were produced based on geographical information system (GIS) technology. Heavy metals and PAH were detected at high concentration and provide evidence for several anthropogenic inputs to the lagoon. A significant spatial relationship was found for Fe, Zn, and Cu in the sediment using a GIS-based analysis, suggesting that these metal contaminants in the sediments of the Biétri bay had common sources.

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Organic and bacterial pollution in the Ebrié lagoon, côte d'Ivoire

Cited by 20 publications

References 5 publications

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

Seasonal variability of methane in the rivers and lagoons of Ivory Coast (West Africa)

Seasonal Variability of Carbon Dioxide in the Rivers and Lagoons of Ivory Coast (West Africa)

Heavy metal and polycyclic aromatic hydrocarbons in Ebrié lagoon sediments, Côte d’Ivoire

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