caa a22 4500 445892323 CHVBK 20180317145620.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10750-011-0661-0 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0661-0 Effects of nutrients and light on periphytic biomass and nutrient stoichiometry in a tropical black-water aquatic ecosystem [Elektronische Daten] [Lúcia Sanches, Rafael Guariento, Adriano Caliman, Reinaldo Bozelli, Francisco Esteves] This article aims to test the light-nutrient hypothesis (LNH) in a periphytic community in a tropical black-water lake. Individual and interactive effects of light and nutrient availability were assessed with periphyton biomass accrual, nutrient content, and nutrient stoichiometry. We performed a manipulative field experiment with a 4×2 factorial design. We used nutrient diffusing substrates to produce four different nutrients treatments: Control (no nutrient added), nitrogen amended (N), phosphorus amended (P) and combined N and P amendment (NP). Two light levels were also considered: high light (near surface water) and low light (near bottom water). Light and nutrients individually and interactively caused significant changes in aggregate periphyton community properties. Total and autotrophic biomasses were significantly higher in high light conditions and in nutrient enriched treatments. Autotrophic biomass was significantly higher in N enriched treatment whereas total biomass was mainly affected by the joint addition of N and P. At lower light availability periphyton growth was limited, even in enriched treatments. Light also strongly affected periphyton nutrient content. Periphyton C, N and P in general increased when subjected to high light conditions. As predicted by the LNH, light promoted an increase in periphyton C:P ratios in P deprived treatments, but an opposite effect was observed on C:N ratios, especially in N-enriched treatments. This experiment revealed that light availability strongly limits the propagation of nutrient effects on periphyton growth. Such complex interdependencies on basal resources affect the proportion of autotrophic to total periphytic biomass that can be an important mechanism to explain variation in the nutrient stoichiometry of periphyton in nature. Springer Science+Business Media B.V., 2011 Resource availability nationallicence Light-nutrient hypothesis nationallicence Shallow lakes nationallicence Humic lakes nationallicence Littoral region nationallicence Benthic algae nationallicence Sanches Lúcia Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut Guariento Rafael Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut Caliman Adriano Departamento de Botânica, Ecologia e Zoologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, CEP 59078-900, Natal, RN, Brazil aut Bozelli Reinaldo Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut Esteves Francisco Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut Hydrobiologia Springer Netherlands 669/1(2011-07-01), 35-44 0018-8158 669:1<35 2011 669 10750 https://doi.org/10.1007/s10750-011-0661-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0661-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sanches Lúcia Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Guariento Rafael Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Caliman Adriano Departamento de Botânica, Ecologia e Zoologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, CEP 59078-900, Natal, RN, Brazil aut NATIONALLICENCE 700 1- Bozelli Reinaldo Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Esteves Francisco Departamento de Ecologia, Instituto de Biologia, Prédio do CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CP 68020, CEP 21941-590, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 669/1(2011-07-01), 35-44 0018-8158 669:1<35 2011 669 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer