Molecular characterization of the invasive aquatic macrophyte Hydrilla verticillata (Hydrocharitaceae) in Brazil.

Invasive populations of macrophytes are widely distributed and have been successfully introduced and established in freshwater habitats. Hydrilla verticillata was first recorded in 2005 in the Upper Paraná River floodplain and in 2007 at the Itaipu Reservoir (Brazil-Paraguay border, ca. 300 km downstream from its first record).

Long-wavelength sensitive opsin (LWS) gene variability in Neotropical cichlids (Teleostei: Cichlidae).

Cichlid fishes are an important group in evolutionary biology due to their fast speciation. This group depends widely of vision for feeding and reproduction. During the evolutionary process it plays a significant role in interspecific and intraspecific recognition and in its ecology.