Abstract
Water transparency is one of the main indicators of seasonal changes from the water level in lacustrine systems, but other environmental spatial and temporal variables can act jointly on water transparency. The diagnosis of interactions among physical-chemical variables and water transparency can be made by fitting statistical models based on multiple regression analysis. The objective of this study is to evaluate the set of limnologic variables that best predict the seasonal variation in water transparency in lakes of the western Amazon. These data were collected in both the drought and flood seasons in 78 lakes of the Mamirauá Reserve for Sustainable Development (RDSM). The delineation of the sampling followed the choice of variables, the analysis of premises imposed by the linear regression model and the validation of the model. The variables that best fitted the model were: water level, bottom temperature, conductivity, and pH for both seasons analyzed (R2 = 0.64). The resulting model suggests that the physical-chemical variables influence the re-suspension process and sedimentation of particulate material together with the seasonal variation of the water level at the lake system of RDSM
Highlights
The Amazon floodplain is one of the most extensive wetlands on Earth
Its area has an extension of 300,000 km2, considering only the Central Amazon section (IRION et al, 1997)
Most of the lakes in these systems are formed by the lateral displacement of the main channel of meandering rivers (SIOLI, 1984) and their chemical composition depends on the entry of water masses originated from the associated river, from the tributaries of terra firma
Summary
The Amazon floodplain is one of the most extensive wetlands on Earth. Its area has an extension of 300,000 km, considering only the Central Amazon section (IRION et al, 1997). It is a flat region, with a height gradient of around 120 m along its entire extension. Due to this low gradient, water level variations in the main channel between 7 and 13 m correspond to an inundation area of 20 to 100 km perpendicular to the river’s margins (COSTA, 2005). Most of the lakes in these systems are formed by the lateral displacement of the main channel of meandering rivers (SIOLI, 1984) and their chemical composition depends on the entry of water masses originated from the associated river, from the tributaries of terra firma
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