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AIM: Our aim was to identify dissolved organic matter (DOM) main sources in environments of the Upper Parana River floodplain and their seasonal and spatial variation. METHODS: Ultraviolet-visible and fluorescence spectroscopy were utilized. The samples were obtained from November 2007 to September 2008 in six lakes of the floodplain. RESULTS: DOM quality differs among environments and also between rainy and dry season. The environments connected with Parana River showed a high variation on the allochthonous/autochthonous proportion. Aquatic macrophytes might represent an important contribution to DOM in Garcas and Osmar lakes. CONCLUSIONS: In general, environments connected to Parana River have a greater influence of autochthonous DOC, while the others are most influenced by allochthonous inputs.

Spatial and seasonal distribution of chromophoric dissolved organic matter in the Upper Paraná River floodplain environments ( Brazil)