Temporal Variation in C, N and P of the Periphyton on the Tropical Aquatic Macrophyte Echinochloa polystachya (H.B.K.) HITCH. in Jurumirim Reservoir (São Paulo, Brazil)

Abstract

The temporal variations in C, N and P concentrations of the periphyton on the natural substratum (Echinochloa polystachya) and its relationships to the water's climatological (air temperature and precipitation), hydrodynamic (water discharge and water level), physical (temperature, transparency) and chemical variables (conductivity, total suspended solids, nitrate, nitrite, ammonia, silica, total phosphorus and orthophosphate)were evaluated in a lagoon at the Paranapanema River mouth into the Jurumirim Reservoir (Sao Paulo, Brazil) from August 1993 to July 1994. An amplitude variation of 2.0 m in water level was observed.Depending on to the hydrologic conditions, the lagoon presents intermediate conditions of lentic and lotic environments.The amplitude variations in C, N and P were 14.5-52.1%C DW-1, 0.5-3.2% N DW-1, and 0.03-0.4% P DW-1, respectively.The periphyton presented a decreased protein content. The environmental trophic degree appears to be decisive in chemical periphyton composition.

Biomass and elemental composition (C, N, H) of the periphytic community attached to Polygonum punctatum Ell. in a subtropical reservoir and its relationship to environmental factors

“…According to the authors, the remainder of the carbon in the periphyton was due to the production of mucilage and other organic materials by bacteria and algae. Moschini-Carlos et al (1998) and Guariento et al (2011) measured average concentrations of carbon in the periphytic biomass that were higher than those found in the present study. One possible explanation for this fact might be the different types of substrate colonisation of periphyton, as was observed by Zebek (2009).…”

“…The concentrations of carbon and nitrogen in the periphytic community also showed strong correlations with nitrate concentrations. In a study of the Jurumirim reservoir (São Paulo State, Brazil), Moschini-Carlos et al (1998) also found positive relationships between the elemental composition of the periphyton and the hydrological regime, which supports our hypothesis.…”

Variação temporal do fitoplâncton de um lago pertencente à Área de Proteção Permanente no estado de Alagoas, nordeste do Brasil

“…Assim, a variação da composição específi ca ou da densidade do fi toplâncton nesses lagos está associada, geralmente, a fatores locais (Esteves 1998). Moschini-Carlos et al (1998), observaram que as concentrações mais elevadas de nutrientes numa lagoa próximo ao rio Paranapanema, SP, foi durante o período de seca, considerando as variações no nível d'água como um dos fatores determinantes. A biomassa fi toplanctônica, em termos de clorofi la a, apresentou uma menor concentração nos meses de abril e setembro de 2008, ambos no ponto 1 (0,3 μg.L -1 ) e a maior concentração de clorofi la a ocorreu no mês de junho de 2008 com 8,5 μg.L -1 (ponto 1) (Tab.…”

Biomassa e composição elementar (C, N e P) da comunidade perifítica em diferentes gradientes fluviais tropical (alto rio Santa Maria da Vitória, Espírito Santo, Brasil)

“…Esta comunidade é caracterizada também pela habilidade em responder às mudanças ambientais e disponibilidade de nutrientes nos diversos ecossistemas aquáticos (Moschini-Carlos et al, 1998), principalmente nitrogênio e fósforo.…”