Modelling phaeopigments concentrations in water from a shallow mesotrophic lagoon
Résumé
Concentrations of phaeopigments (Pha) and chlorophyll a (Chl) were determined in surface waters from a temperate lagoon during six sampling campaigns at high and at low tide. In order to develop models for phaeopigments concentration in water it was necessary to replace Chl with photosynthetic pigment concentration (Pt =Pha+Chl) as one of the explanatory variables. Under first approximation, food availability and water temperature (T) could be considered as independent variables. The concentrations of Pha were then determined following seasonal change of response curves of the consumer community on T. However, multiple regression models with Pt , T and, eventually salinity as explanatory variables were better able to depict Pha. All equations, developed with Pt , were also solved using Chl as an input variable. Although part of the performance was lost, such back-transformed models can be used at low / medium T and moderate to high concentrations of Chl. The developed equations about middle to long-term variations of Pha could be applied to study the biogeochemistry of contaminants related to Pha, and to evaluate the dependence on temperature of phytoplankton utilisation by consumers.