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- W773304839 abstract "The study aimed at (a) characterizing the main periphytic algae community structural modifications under nitrogen and phosphorus pulses enrichment conditions; (b) identifying the formation of indicating species guilds; and (c) evaluating the periphyton contribution towards phosphorus retention facing other biological compartments in the system. Experiment was carried out in a tropical shallow reservoir using water flux controled mesocosms where microscope glass slides were placed for periphyton attachment, 78 L reservoir water and 100 Ricciocarpus natans individuals. Experiment design included one control and three treatments (n = 3) with different nutrient concentrations (molar N/P ratio = 44): T1 100 μgP L and 2,000 μgN L; T2 200 μgP L and 4,000 μgN L; T3 400 μgP L and 8,000 μgN L. Seventeen weekly samplings were performed during 64 consecutive days, one of them carried out before the enrichment (pre-enrichment) and the other one 24 hr after P addition (postenrichment). Principal Component Analysis separated observations of the control and preenrichment from those of the post-enrichment. According to OECD, treatments were classified as mesotrophic (C), eutrophic (T1, T2) and hypereutrophic (T3). Periphytic biomass increase was mostly directed by the increasing nutrient loads, and less by the enrichment pulses. Cumulative effect of pulses on the phytoplankton biomass was much lesser and evident only at T3 treatment for the macrophytes. Chemical decomposition of the biota did not respond to the increase in nutrient loads, and the autotrophic communities remained P-limited. Regarding to the mass balance, seston was the main P sequestrator, followed by the complex macrophytes-periphyton and the periphyton. Substantial part of P remained, however, trapped much probably in the sediments and its associated microflora. Three guilds indicative of environmental conditions were identified. Guild 1, of mesotrophy (C), was represented mainly by three desmid species; guild 2, of eutrophy (T2), by four diatom species, with special emphasis to two of them; and guild 3, of hypereutrophy (T3), mainly by six species representative of three algal classes. Present results reinforce the use of periphyton in the earlier identification of eutrophication and the potential role of the periphytic community in the phosphorus dynamics in tropical lacustrine systems." @default.
- W773304839 created "2016-06-24" @default.
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- W773304839 date "2007-03-28" @default.
- W773304839 modified "2023-09-23" @default.
- W773304839 title "Resposta do perifíton aos pulsos de enriquecimento em níveis crescentes de fósforo e nitrogênio em represa tropical mesotrófica (Lago das Ninféias, São Paulo)" @default.
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