Now showing items 1-10 of 2225
Photochemical activity of PSII of tropical phytoplankton communities of Southern Brazil exposed to solar radiation and nutrient addition
(Elsevier Science Inc, 2014)
We carried out short- and mid-term incubations to assess the combined impact of solar ultraviolet radiation (UVR, 280-400nm) and nutrient addition on tropical phytoplankton communities from BabitongaBay, Southern Brazil. ...
Native and alien herbaceous plants in the Brazilian Cerrado are (co-)limited by different nutrients
Background and aims: The diverse flora of the Brazilian Cerrado is threatened by agricultural expansion, nutrient enrichment and invasion of alien plants. We performed a fertilization experiment to investigate the nature ...
The effect of nutrient addition on metal tolerance in Salvinia herzogii
(Elsevier Science, 2007-10)
Disappearance of floating macrophytes was observed in two successively constructed wetlands for the treatment of wastewater that contained Zn, Ni and Cr at a tool factory in Argentina. Experimental work was developed to ...
Effects of nutrient enrichment on epipelic diatom assemblages in a nutrient-rich lowland stream, Pampa Region, Argentina
We analyzed the diatom assemblages inhabiting the epipelic biofilm of a Pampean stream, characterized by their high basal nutrient levels, when exposed to a continuous surplus of inorganic nutrients. An in situ experience ...
Efeitos da tilápia do Nilo (Oreochromis niloticus) e do enriquecimento por nutrientes sobre a comunidade planctônica em um lago artificial no semi-árido brasileiro
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Bioecologia AquáticaBioecologia Aquática, 2008-06-02)
The major aim of this study was to test the hypothesis that the introduction of the Nile tilapia (Oreochromis niloticus) and the enrichment with nutrients (N and P) interact synergistically to change the structure of ...
Source-driven remobilizations of nutrients within stem wood in Eucalyptus grandis plantations
Nutrient remobilizations in tree ligneous components have been little studied in tropical forests. A complete randomized block design was installed in Brazilian eucalypt plantations to quantify the remobilizations of ...
Disponibilidade de nutrientes no solo: decomposição e liberação de compostos orgânicos de resíduos vegetais
(Sociedade Brasileira de Ciência do Solo, 2014)
The imprint of crop choice on global nutrient needs
(Iop Publishing, 2014-08)
Solutions to meet growing food requirements in a world of limited suitable land and degrading environment focus mainly on increasing crop yields, particularly in poorly performing regions, and reducing animal product ...
Effects of nutrient loading, temperature regime and grazing pressure on nutrient limitation of periphyton in experimental ponds
We studied nutrient limitation of periphytic algae (henceforth periphyton) in 24 mesocosms simulating shallow lakes with two nutrient levels, enriched (with added nitrogen, N, and phosphorus, P) and unenriched (control), ...