Functional diversity of bacterioplankton assemblages in western Antarctic seawaters during late spring

Functional diversity and aminopeptidase activity (AMA) in bacterial assemblages were determined in western Antarctic waters during late spring 2002. Functional diversity was assayed by the patterns of sole carbon source utilization in Biolog-ECO Microplates(TM) and AMA with the fluorogenic substrate...

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Bibliographic Details
Published in:Marine Ecology Progress Series
Main Authors: Sala, Maria Montserrat, Arin, Laura, Balague, Vanessa, Felipe, Jordi, Guadayol, Oscar, Vaque, Dolors
Format: Article in Journal/Newspaper
Language:English
Published: Inter Research 2005
Subjects:
C180 Ecology
F700 Ocean Sciences
C500 Microbiology
Antarctic
Bransfield Strait
Gerlache
Gerlache Strait
Antarc*
Online Access:https://eprints.lincoln.ac.uk/id/eprint/16480/
https://eprints.lincoln.ac.uk/id/eprint/16480/1/sala_etal_05.pdf
https://doi.org/10.3354/meps292013
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Summary:Functional diversity and aminopeptidase activity (AMA) in bacterial assemblages were determined in western Antarctic waters during late spring 2002. Functional diversity was assayed by the patterns of sole carbon source utilization in Biolog-ECO Microplates(TM) and AMA with the fluorogenic substrate leucine 7-amido-4-methylcoumarin. N-acetyl-D-glucosamine and D-cellobiose were the most used carbohydrates. This suggested that used dissolved organic carbon (DOC) was mostly of either zoo-or phytoplankton origin. Principal component analysis of the sole carbon source utilization profiles separated the samples according to salinity and temperature. This separation corresponded roughly with the 3 areas of study: Bransfield Strait (BR), Gerlache Strait (GE) and Belling-shausen Sea (BE). AMA was higher in the upper 40 m, probably associated with the higher organic matter load. Phytoplankton biomass was the factor that accounted for the highest variance in AMA, but did not have a clear influence on functional diversity of bacterioplankton. Our findings indicate that differences in functional diversity of bacterioplankton populations in western Antarctic waters are not directly related to phytoplanktonic abundance. This suggests that bacteria could utilize other carbon sources than DOC freshly released by phytoplankton.

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