The flux of methane ( CH 4 ) from inland waters to the atmosphere has a profound impact on global atmospheric greenhouse gas ( GHG ) levels, and yet, strikingly little is known about the dynamics controlling sources and sinks of CH 4 in the aquatic setting. Here, we examine the cycling and flux of CH 4 in six large rivers in the A mazon basin, including the A mazon R iver. Based on stable isotopic mass balances of CH 4 , input...

Assuming the paradigm that catchment vegetation is the main source of particulate organic matter (POM) to rivers, the main objective of this study was to determine what the proportion of original C3 carbon from the forest had already been replaced by C4 carbon from sugar cane and pasture in the rivers of the Piracicaba Basin. In order to achieve this objective, we first produced a detailed landcover map using Landsat5‐TM image...