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Tropical freshwater ecosystems have lower bacterial growth efficiency than temperate ones
It is argued that higher temperature, nutrient limitation, and light exposure all contribute to lower BGE in the tropics, mediated through effects on thermodynamics, substrate stoichiometry, nutrient availability and interactions with photochemically produced compounds.
DOC removal paradigms in highly humic aquatic ecosystems
- V. Farjalla, A. Amado, A. L. Suhett, Frederico Meirelles-Pereira
- Environmental ScienceEnvironmental science and pollution research…
- 22 May 2009
HS may be an important source of energy for aquatic bacteria in humic waters, but it is probably not as important as a substrate to bacterial growth and to aquatic food webs, since HS consumption is mostly channeled through microbial respiration.
Long-Term CO2 Variability in Two Shallow Tropical Lakes Experiencing Episodic Eutrophication and Acidification Events
- H. Marotta, C. Duarte, Frederico Meirelles-Pereira, Luiz Bento, F. Esteves, A. Enrich-Prast
- Environmental ScienceEcosystems
- 9 April 2010
Here we report the long-term (13-year) dynamics of surface pCO2 and its response to episodic eutrophication and acidification events in two contrasting tropical coastal lakes, one clear-water and the…
Ecological aspects of the antimicrobial resistence in bacteria of importance to humn infections
The capacity for dilution in the ecosystem, and salinity appeared related with the occurrence of multi-resistant bacterial strains, and the intensity of recent fecal contamination was not shown to be associated with the numbers and types of markers found.
Detection of multidrug-resistant Enterobacteriaceae isolated from river waters flowing to the Guanabara Bay and from clinical samples of hospitals in Rio de Janeiro, Brazil
- Verônica Dias Gonçalves, Frederico Meirelles-Pereira, José Augusto Adler Pereira
- BiologyBiomedica : revista del Instituto Nacional de…
- 1 May 2019
The detection of microorganisms presenting genetic elements in environments such as water is necessary for the prevention and control of their dissemination with potential to infect humans and other animals in eventual contact with these environments.
The Combination of Different Carbon Sources Enhances Bacterial Growth Efficiency in Aquatic Ecosystems
- E. S. Fonte, A. Amado, Frederico Meirelles-Pereira, F. Esteves, A. Rosado, V. Farjalla
- Environmental ScienceMicrobial Ecology
- 22 August 2013
Evidence is provided that the mixture of different DOC sources is a key factor affecting the role of bacteria in the carbon flux of aquatic ecosystems and that mixtures of DOC sources result in a more efficient biological use of carbon.
Aquatic macrophytes drive sediment stoichiometry and the suspended particulate organic carbon composition of a tropical coastal lagoon
- C. Marinho, Frederico Meirelles-Pereira, A. Gripp, Camilla de Carvalho Guimarães, F. Esteves, R. Bozelli
- Chemistry, Environmental Science
- 1 June 2010
OBJETIVO: O objetivo desta pesquisa foi avaliar: (1) a influencia das macrofitas aquaticas Typha domingensis Pers., Eleocharis interstincta (Vahl) Roem. & Schult. (emergentes) e Potamogeton…
Origin, concentration, availability and fate of dissolved organic carbon in coastal lagoons of the Rio de Janeiro State
As lagoas costeiras do norte do Estado do Rio de Janeiro apresentam um amplo gradiente de carbono orgânico dissolvido (COD) e coloracao da agua, com as maiores concentracoes registradas na…
Effects of food web structure and resource subsidies on the patterns and mechanisms of temporal coherence in a tropical coastal lagoon: an experimental mesocosm approach
Results indicam that a predacao de peixes e a disponibilidade oferta de recursos podem afetar significativamente padroes de coerencia temporal, mas tais efeitos dependerao mais de eFeitos diretos do fator local sobre a variavel do que da identidade da propriavariavel.
Detection of bacterial samples on the aquatic ecosystems adjacent to Saquarema Lagoon – Rio de Janeiro
There were not detected resistant samples to antimicrobial drugs normally used in hospital settings, which may possibly refute the idea of a contamination by nosocomial and/or veterinary sewage discharge.