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Egeria densa is a submerged aquatic macrophyte which, in Brazil, causes problems specially for electric energy generation. The purpose of this study was to evaluate the photosynthetic rate of E. densa in two rivers (Aguapeú and Mambu) with different limnological features, both located in the Itanhaém River Basin. This species is abundant in both rivers without causing damages to their multiple uses. Photosynthetic rates were analysed in February, May, August and November 1998 and limnological variables of the water and sediment were also measured. The highest value of gross photosynthesis (GP) was detected in May (10.06 in Aguapeú and 6.10 mgO2/gDW/h in Mambu), when under-water photosynthetic active radiation (PAR) was also high (1,126.7 and 895.8 m mol/m/s, respectively). GP, total phosphorous, total CO2 and PAR were always higher in Aguapeú River. Egeria densa é uma macrófita aquática submersa que, no Brasil, tem causado prejuízos principalmente na geração de energia elétrica. O objetivo deste estudo é avaliar a taxa fotossintética de E. densa em dois rios com características limnológicas diferentes (Aguapeú e Mambu), ambos pertencentes à bacia do rio Itanhaém. Esta espécie ocorre abundantemente em ambos os rios, mas sem causar danos aos seus usos múltiplos. As determinações das taxas fotossintéticas foram realizadas em fevereiro, maio, agosto e novembro de 1998 e as variáveis limnológicas da água e do sedimento também foram analisadas. A maior fotossíntese bruta (FB) foi medida em maio (10,06 no rio Aguapeú e 6,10 mgO2/gDW/h no rio Mambu), quando a radiação fotossinteticamente ativa (RFA) também foi maior (1126,7 e 895,7 m mol/m2/s, respectivamente). FB, fósforo total, CO2 total e RFA foram sempre maiores no rio Aguapeú

brazilian archives of biology and technology

Photosynthetic rate of the aquatic macrophyte Egeria densa Planch. (Hydrocharitaceae) in two rivers from the Itanhaém River Basin in São Paulo State, Brazil