 This study examined the effects of river connectivity and environmental conditions on the limnology of inland water bodies in the Piranha River floodplain. It found that river connectivity was an important factor in determining the limnological characteristics of the lakes, while environmental conditions such as Secchi-Disk transparency and total phosphorus levels varied over time due to changes in the river's flow rate and the closure of a dam. Additionally, the study concluded that the higher transparency of the river water likely diluted the concentration of phosphorus in the lake water during major flooding events, potentially affecting the productivity of the lake. This article was authored by M. C. Roberto, N. F. Santana, and S. M. Thommage.