Oligotrophic Lake
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. Occurrence of concavities on the lorica of two species of Testudinella (Rotifera, Monogononta, Testudinellidae)
Resumo: Testudinella é um táxon de Rotifera amplamente distribuído no Brasil. Em recentes coletas em lagos marginais conectados ao rio Paranapanema (São Paulo, Brasil), nós encontramos espécimes de Testudinella mucronata e T. patina com concavidades em suas lóricas. O objetivo do estudo foi descrever as concavidades observadas em indivíduos de ambas
Biota Neotrop.. Publicado em: 21/02/2019
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2. Morphology and morphometry of upland lakes over lateritic crust, Serra dos Carajás, southeastern Amazon region
ABSTRACT High-resolution satellite images, digital elevation models, bathymetric and sedimentological surveys coupled with statistical analysis were used to understand the physical environment and discuss their influence on water quality of the five upland lakes of Serra Sul dos Carajás, southeast Amazonia. The lakes have mid-altitude ranges (elevation), ve
An. Acad. Bras. Ciênc.. Publicado em: 17/05/2018
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3. Species assemblages of zooplanktonic crustaceans in mountain shallow ponds of Chile (Parque Cañi)
Even though the Chilean lakes are characterized by their oligotrophy, a transition from oligotrophy to mesotrophy, due human intervention, has been reported in some lakes. Nevertheless, there are still some pristine and unpolluted small lakes and ponds in mountain zones, free of human intervention and surrounded by native forests. Nine unpolluted, oligotroph
Zoologia (Curitiba). Publicado em: 2010-02
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4. Flora diatomácea do reservatório Cabuçu, Município de Guarulhos, SP: taxonomia e aplicação como indicadores geoambientais
The present work carried out in the Cabuçu Lake, in the city of Guarulhos State of São Paulo. Brazil identified and catalogued the 63 species diatoms. The more representative diatoms found attached on aquatic plants, in all samples, were Cyclotella meneghiniana, C. stelligera, Eunotia pectinalis, E. formica, E. monodon, Pinnularia braunii, P. dactylus, P.
Publicado em: 2007
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5. Variação espacial e temporal da comunidade fitoplanctônica da Lagoa Bonita, DF
The Distrito Federal has few natural lagoons. Between them distinguishes the Lagoa Bonita located in Estação Ecológica de Águas Emendadas (15 32 to 15 38 S and 47 33 to 47 37 W). The objective of this work was to analyse the structure and dynamics of the phytoplankton community of Lagoa Bonita considering its spatial and temporal variation. The phytoplan
Publicado em: 2007
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6. Caracterização limnológica e análise de comunidades bentônicas sujeitas à invasão por espécies exóticas, em lagos do Vale do Rio Doce, MG, Brasil / Limnological characterization and analysis of benthic communities subject to the invasion by exotic species in Rio Doce Valley lakes, MG, Brazil
Benthic macroinvertebrates are important components of aquatic ecosystems due to their role in the energy flow and material cycling. They have gradually received more attention in ecological studies in the last decades. The present study aimed a comparative limnological characterization of four lakes belonging to the middle Rio Doce Valley lacustrine system,
Publicado em: 2006
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7. 5′-Nucleotidase Activity in a Eutrophic Lake and an Oligotrophic Lake
Differences in enzymatic hydrolysis of dissolved organic phosphorus and subsequent phosphorus uptake were compared by using dual-labeled (γ-32P and 2-3H) ATP in oligotrophic Lake Michigan and a moderately eutrophic lake in southeastern Michigan. More than 50% of the phosphate that was hydrolyzed was immediately taken up into bacterium-sized particles in the
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8. Sensitivity of an Oligotrophic Lake Planktonic Bacterial Community to Oxygen Stress
Dissolved oxygen at approximately four times normal saturation (42 mg liter−1) inhibited the growth and metabolism of summer planktonic bacteria in the surface water of alpine oligotrophic Mountain Lake (Giles County, Va.). Data were derived from growth of CFU on membrane filters, d-[U-14C]glucose incorporation into the extractable lipid of these CFU, and
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9. Nitrate Accumulation in Aerobic Hypolimnia: Relative Importance of Benthic and Planktonic Nitrifiers in an Oligotrophic Lake
Both nitrate and nitrous oxide accumulate in the hypolimnion of the oligotrophic Lake Taupo, New Zealand, throughout stratification. The two forms of oxidized nitrogen increase in concentration with increasing depth toward the sediments, where the dissolved concentrations of reduced nitrogen are two orders of magnitude higher than concentrations in the overl
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10. Nitrate Accumulation in Aerobic Hypolimnia: Relative Importance of Benthic and Planktonic Nitrifiers in an Oligotrophic Lake
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11. Effects of Nutrients on Specific Growth Rate of Bacterioplankton in Oligotrophic Lake Water Cultures †
The effects of organic and inorganic nutrient additions on the specific growth rates of bacterioplankton in oligotrophic lake water cultures were investigated. Lake water was first passed through 0.8-μm-pore-size filters (prescreening) to remove bacterivores and to minimize confounding effects of algae. Specific growth rates were calculated from changes in
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12. Seasonal and Spatial Variations in Mercury Methylation and Demethylation in an Oligotrophic Lake
Microbial mercury methylation and methylmercury decomposition were examined in Lake Clara, an oligotrophic northern Wisconsin seepage lake, using radioisotopic tracers. Methylation activity was near background in the water column, was greatest in the profundal surficial sediments, and decreased with depth in sediment cores. Active demethylation occurred in t