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MARTINS, D.; COSTA, N.V.; TERRA, M.A. and MARCHI, S.R.. Characterization of the aquatic plant communities of 18 reservoirs of five watersheds in Sao Paulo, Brazil. Planta daninha [online]. 2008, vol.26, n.1, pp. 17-32. ISSN 0100-8358. http://dx.doi.org/10.1590/S0100-83582008000100003.
The objective of this work was to evaluate and compare the aquatic plant composition of 18 reservoirs in five watershed basins in SP-Brazil. The survey was carried out on a boat from February to September 2002, comprising the watersheds basins of the rivers Paraíba, Paraná, Paranapanema, Grande and Tietê. On average, every 20 minutes a sampling point was determined by means of a portable GPS, and the species were identified based on high density, average density and low density. A total of 39 species was identified, distributed in 21 families. The prominent species were the floating Salvinia auriculata, Eichhornia crassipes, Eichhornia azurea, Pistia stratiotes and the immersed Polygonum lapathifolium, Brachiaria arrecta, Brachiaria mutica, Cyperus sp. and Typha latifolia, considering the four species occurring most frequently in each basin. The largest similarity index (0.71) was verified for rivers Paranapanema and Grande basins, while the lowest (0.49) was observed for the rivers Paraíba and Tietê basins.
Keywords : survey; weed; hydroelectric power and aquatic macrophytes.