plant com-munities in the semiarid region of Brazil recorded less species thanour study, with six studies recording less than 40 species. Therewere only two studies recording more species than our phytosoci-ological work (Table 4). Among the published studies to date, mostare floristic surveys and only two (Matias et al., 2003; Tabosa et al.,2012) present data on the structure of aquatic plant communities.