Show simple item record Palma-Silva, Cleber Albertoni, Edélti Faria Esteves, Francisco de Assis 2010-10-02T17:26:59Z 2010-10-02T17:26:59Z 2004
dc.identifier.citation PALMA-SILVA, C. ; ALBERTONI, E. F. ; ESTEVES, F. A. . Charophytes as a reservoir of nutrients and energy in a tropical coastal lagoon suject to human impact (RJ, Brazil).. Brazilian Journal of Biology, São Carlos, v. 64, n. 3, p. 1-9, 2004. pt_BR
dc.identifier.issn 1519-6984
dc.identifier.issn 1678-4375
dc.description.abstract In the Imboassica Lagoon (22o 24’S and 42o 42’W) (Macaé, RJ, Brazil), two species of macroalgae of the genus Chara (C. angolensis and C. fibrosa) registered in large areas were identified. The lagoon is subject to several relevant anthropic impacts, of which untreated sewage is one of the most important. Results of the biomass distribution as analyzed in different areas of the lagoon showed values ranging from 172 to 510 gDW.m–2 . As for the nutrient concentration, the results presented large fluctuations, with carbon values ranging from 325 to 392 mg.g–1 DW, those of nitrogen, from 14 to 27 mg.g–1 DW, and of phosphorus from 0.45 to 0.85 mg.g–1 DW. This led to large fluctuations of the C:N:P ratio (from 387:24:1 to 872:47:1). The minimum and maximum energetic values of the biomass were 9.54 e 12.34 kJ.g–1 DW. Smaller C:N:P ratios tended to occur in more eutrophic areas. The association between biomass and nu- trient concentration showed that the highest quantities in the beds are found in oligotrophic areas. The Spearman correlation between nutrient concentration in the water column and biomass was r s = 0.45 (p < 0.05) for nitrogen and r s = 0.50 (p < 0.01) for phosphorus (n = 30). The large total biomass asso- ciated with nutrient concentration and energy content indicates that Charophytes are an important bio- logical compartment in the structure and metabolism of the lagoon. pt_BR
dc.language.iso eng pt_BR
dc.rights open access
dc.subject Aquatic macrophyte pt_BR
dc.subject Biomass pt_BR
dc.subject Nutrients pt_BR
dc.subject Chemical composition pt_BR
dc.subject Pollution pt_BR
dc.subject Macrófita aquática pt_BR
dc.subject Biomass pt_BR
dc.subject Nutrientes pt_BR
dc.subject Composição química pt_BR
dc.subject Poluição pt_BR
dc.title Charophytes as a nutrient and energy reservoir in a tropical coastal lagoon impacted by humans (RJ, Brazil) pt_BR
dc.type article pt_BR

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