Abstract
Dissolved inorganic nitrogen and phosphorus are among the pollutants that are used worldwide for coastal waters quality assessment due to their ecological and toxicological effects on the aquatic ecosystems. Waters quality along the Abobo-Doume Fish Market in Ebrie Lagoon was assessed using five (5) stations by measuring pH, temperature, salinity, Electric conductivity, transparency and Total dissolved solids (TDS) on one hand, and on the other hand, inorganic nutrients concentrations as ammonium (NH4+), nitrite (NO2-), nitrate (NO3-) and phosphates (PO43-) by colorimetric methods. To quantify the primary production limitation, the N:P ratios were calculated and then compared to the Redfield one (16:1). Temperature, pH, salinity, Electric conductivity, transparency and Total Dissolved Solids (TDS) were found in respective ranges of 27.99-28.71°C 8.23-8.39 28.50-30.43‰ 44.30-46.7mS/Cm, 0.5-1.0m and 27.48-29.11 mg/L. NH4+, NO2-, NO3- and PO43- were found in the respective ranges of 0.318-0.753, 0.060-0.067, 1.90-5.20 and 0.38-0.55 mg/L. The highest concentrations of nitrogen and phosphorus species were respectively observed in surface and bottom waters. The analyzed waters were of Bad Quality due to high nitrate, nitrite and phosphates concentrations that were more than three times above the Bad Quality Class defined by the European Environmental Agencys criteria. The N:P ratios ranged from 7.94 to 25.36, and the ratios observed in surface waters were higher than the bottom ones. Waters were generally phosphorus (P)-Limited in surface and nitrogen (N)-Limited in bottom layers. Due to the high nutrients concentrations observed, a long-term assessment is therefore recommended to evaluate the temporal trends of the waters quality along Abobo-Doume Fish Market.
Highlights
Dissolved inorganic nitrogen and phosphorus are among the pollutants that are used worldwide for coastal waters quality assessment due to their ecological and toxicological effects on the aquatic ecosystemsWaters’ quality along the Abobo-Doumé Fish Market in
Due to the high nutrients concentrations observed, a long-term assessment is recommended to evaluate the temporal trends of the waters quality along Abobo-Doumé Fish Market
Nitrite and nitrate concentrations observed along Abobo-Doumé Fish Market were in the respective ranges of 0.65 to 1.50 μmol/L and 19.35 to 83.87 μmol/L(Table 4)
Summary
Sampling: For the present study, samples were collected in surface and bottom waters in April 2016 after a rain in five selected stations along the Abobo-Doumé Area in the Ebrié Lagoon (Côte d’Ivoire) (Figure 1). Surface waters were slightly hot with a mean value of 28.47±0.29 °C than the bottom ones where a mean temperature of 27.07±1.91°C was recorded(Table 2). A stratification was observed between surface and bottom waters at stations S3, S4 and S5 where the depths were above 5m (Figure 2a). In waters along the ADFM, pH values were found in the ranges of 8.14 to 8.39 and 7.58 to 8.34 respectively in surface and bottom layers (Table 2; Figure 2b). Table 2:- Ranges, means and standards deviations (SD) of physicochemical parameters observed in waters along
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