Distribution of HNA and LNA bacterial groups in the Southwest Atlantic Ocean
Andrade, Luciana; Gonzalez, Alessandra M; Rezende, Carlos Eduardo; Suzuki, Marina; Valentin, Jean Louis; Paranhos, Rodolfo.
Braz. j. microbiol
; 38(2): 330-336, Apr.-June 2007. ilus, tab
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en Inglés
| LILACS | ID: lil-454917
Bacterioplankton was studied in a large area of Southwest Atlantic Ocean between 13 and 25°S and 28 and 42°W. Samples were collected in 108 stations at 20 m depth. Bacteria were enumerated by flow cytometry after nucleic acid staining with syto13 and two subgroups were differentiated low nucleic acid content (LNA) and high nucleic acid content (HNA) bacteria. Total bacterial numbers varied from 0.37 to 5.53 10(5) cells mL-1. HNA cells represented 15 to 70 percent of the total number while LNA cells represented 30 to 85 percent. Heterotrophic bacterial production was determined by incorporation of tritiated leucine and ranged from 2.7 to 171.07 ng C L-1 h-1. No significant correlation was found between abundance and production. Nevertheless with support of multivariate analysis between bacterial abundance, bacterial production, chlorophyll a and other oceanographic data the distribution of the groups in two different oceanic provinces could be explained by nutrient availability. HNA bacteria accounted for the high percentage of cells found in the area north of 19°S, linked to higher temperature waters and riverine nutrients inputs. LNA bacteria were the dominant cells south of this latitude and were correlated to the higher values of nitrate found for the same area.
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