Structure of the periphytic algae associated with a floating macrophyte in an open lake on the upper Paraná river floodplain, Brazil - doi: 10.4025/actascibiolsci.v35i4.18663. Acta Sci. Biol. Sci. 2013;35(4):513-519. doi:10.4025/actascibiolsci.v35i4.18663