Abstract

TEIXEIRA, Mariana Carolina; AZEVEDO, Júlio César Rodrigues de  and  PAGIORO, Thomaz Aurélio. Spatial and seasonal distribution of chromophoric dissolved organic matter in the Upper Paraná River floodplain environments ( Brazil). Acta Limnol. Bras. [online]. 2011, vol.23, n.4, pp. 333-343.  Epub May 08, 2012. ISSN 2179-975X.  http://dx.doi.org/10.1590/S2179-975X2012005000011.

AIM: Our aim was to identify dissolved organic matter (DOM) main sources in environments of the Upper Paraná 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 Paraná River showed a high variation on the allochthonous/autochthonous proportion. Aquatic macrophytes might represent an important contribution to DOM in Garças and Osmar lakes. CONCLUSIONS: In general, environments connected to Paraná River have a greater influence of autochthonous DOC, while the others are most influenced by allochthonous inputs.

Keywords : DOM; CDOM; DOC; spectroscopy; floodplain.