Microzooplankton
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Grazing of particle-associated bacteria-an elimination of the non-viable fraction
Abstract Quantification of bacteria being grazed by microzooplankton is gaining importance since they serve as energy subsidies for higher trophic levels which consequently influence fish production. Hence, grazing pressure on viable and non-viable fraction of free and particle-associated bacteria in a tropical estuary controlled mainly by protist grazers wa
Braz. J. Microbiol.. Publicado em: 2017-03
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2. VariaÃÃo espaÃo-temporal do microzooplÃncton no estuÃrio do rio Botafogo - PE
The microzooplanktonic community has been recognized for a long time by its tremendous ecological importance in many aquatic ecosystems since they are capable of utilizing resources which are not available to the meso- and macrozooplanltonic fractions representing intermediates between the nano- and picoplankton and higher trophic levels. In estuarine enviro
Publicado em: 2009
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3. Estudo comparativo dos copépodes Temora stylifera e T. turbinata na plataforma continental sudeste do Brasil no verão e inverno de 2002 / Comparative study of the Temora stylifera and T. turbinata on the southeastern Brazilian continental shelf im summer and winter of 2002
Marine biological invasions have impacts in several different levels in the recipient ecosystem, including those related to interactions with native species, especially those sharing similar ecological niches. The main goal of the present work was to investigate the distribution, abundance and biomass of Temora stylifera (native species) and T. turbinata (ex
Publicado em: 2009
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4. DinÃmica do microzooplÃncton no Canal de Santa Cruz, Pernambuco, Brasil
Studies were carried out to assess the transport dynamics and the microzooplanktonic community structure from the south and north inlets of Santa Cruz Channel (Itamaracà â PE) in relation to the adjacent shelf, considering tidal phases and depth. Plankton samples were taken with a pump at three stations along a transect across the inlets. At the central st
Publicado em: 2007
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5. Produção de TEP (Transparent Exopolymer Particles) em culturas de três espécies de microalgas isoladas do reservatório de Barra Bonita (Rio Tietê/SP)
Transparent exopolymer particles (TEP) have recently been documented to be abundant in ocean waters and in algal cultures. TEP play important roles in the ecology of aquatic ecosystems since they might be a direct source of carbon for higher trophic levels via protists and microzooplankton. They also adsorb dissolved compounds and compose the matrix of marin
Publicado em: 2005
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6. Rate of Bacterial Mortality in Aquatic Environments
A method is proposed which provides a minimum estimate of the rate of bacterial mortality in growing natural populations of planktonic bacteria. This estimate is given by the rate of decrease of radioactivity from the DNA of a [3H]thymidine-labeled natural assemblage of bacteria after all added thymidine has been exhausted from the medium. Results obtained f
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7. Tests of the Critical Assumptions of the Dilution Method for Estimating Bacterivory by Microeucaryotes
The critical assumptions of the dilution method for estimating grazing rates of microzooplankton were tested by using a community from the sediment-water interface of Lake Anna, Va. Determination of the appropriate computational model was achieved by regression analysis; the exponential model was appropriate for bacterial growth at Lake Anna. The assumption
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8. Helical Lévy walks: Adjusting searching statistics to resource availability in microzooplankton
The searching trajectories of different animals can be described with a broad class of flight length (lj) distributions with P(lj) = lj–μ. Theoretical studies have shown that changes in these distributions (i.e., different μ values) are key to optimizing the long-term encounter statistics under certain searcher–resource scenarios. In particular, they p
National Academy of Sciences.
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9. Effect of Temperature on Growth, Respiration, and Nutrient Regeneration by an Omnivorous Microflagellate †
The effect of temperature on the rates and extent of carbon and nitrogen cycling by the heterotrophic microflagellate Paraphysomonas imperforata (diameter, 7 to 12 μm) fed with the diatom Phaeodactylum tricornutum was investigated over an ecologically pertinent temperature range (14 to 26°C). All physiological rates investigated increased with increasing t