Bacterial and archaeal communities variability associated with upwelling and anthropogenic pressures in the protection area of Arraial do Cabo (Cabo Frio region - RJ)

Sergio Augusto Coelho-Souza, Fábio V. Araújo, Juliano C. Cury, Hugo E. Jesus, Gilberto C. Pereira, Jean R.D. Guimarães, Raquel S. Peixoto, Alberto M.R. Dávila, Alexandre S. Rosado

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Upwelling systems contain a high diversity of pelagic microorganisms and their composition and activity are defined by factors like temperature and nutrient concentration. Denaturing gradient gel electrophoresis (DGGE) technique was used to verify the spatial and temporal genetic variability of Bacteria and Archaea in two stations of the Arraial do Cabo coastal region, one under upwelling pressure and another under anthropogenic pressure. In addition, biotic and abiotic variables were measured in surface and deep waters from three other stations between these stations. Six samplings were done during a year and adequately represented the degrees of upwelling and anthropogenic pressures to the system. Principal Component Analysis (PCA) showed negative correlations between the concentrationsof ammonia and phosphorous with prokaryotic secondary production and the total heterotrophic bacteria. PCA also showed negative correlation between temperature and the abundance of prokaryotic cells. Bacterial and archaeal co positions were changeable as were the oceanographic conditions, and upwelling had a regional pressure while anthropogenic pressure was punctual. We suggest that the measurement of prokaryotic secondary production was associated with both Bacteria and Archaea activities, and that substrate availability and temperature determine nutrients cycling.
Original languageEnglish (US)
Pages (from-to)1737-1750
Number of pages14
JournalAnais da Academia Brasileira de Ciencias
Volume87
Issue number3
DOIs
StatePublished - Jan 1 2015
Externally publishedYes

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