120 research outputs found
Application des données Landsat à l'estimation de la production du phytoplancton dans le lac Tchad
Premières données sur la production primaire dans la région de Bol (avril-octobre 1968) (lac Tchad)
Une solution graphique d'intégration de la production primaire sur la profondeur et dans le temps
Photosynthetic production and phytoplankton in the euphotic zone of some African and temperate lakes
L'activité photosynthétique du phytoplancton en relation avec le niveau des eaux du lac Tchad (Afrique)
Distribution of carbon in a tropical hypersaline estuary, the Casamance (Senegal, West Africa)
The Casamance estuary, on the coast of Senegal, is an inverse hypersaline estuary : salinity increases landward, and dry season salinity values are up to 172 psu due to the evaporation of seawater. Dissolved inorganic carbon (DIC) concentrations decreased landward as a negative linear function of salinity. Thermodynamic modelling and the absence of CaCO3 in the sediments indicate that this loss of DIC was not due to calcite precipitation in the main water body. The intermost, almost landlocked, waters contained high phytoplankton biomass ... and high concentrations of allochthonous dissolved organic carbon. Photosynthetic uptake of DIC and subsequent particulate organic carbon sedimentation is proposed as hypothetical explanation of the relationship between DIC and salinity; localized overheating in shallow waters might also be involved. (D'après résumé d'auteur
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