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

AuthorsSala, M. Montserrat ; Arin, Laura ; Balagué, Vanessa ; Felipe, Jordi ; Guadayol, Òscar ; Vaqué, Dolors
KeywordsBacterial activity
Functional diversity
Issue Date12-May-2005
PublisherInter Research
CitationMarine Ecology Progress Series 292: 13-21 (2005)
AbstractFunctional 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™ 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 Bellingshausen 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. © Inter-Research 2005
Description9 pages, 5 figures, 3 tables
Publisher version (URL)https://doi.org/10.3354/meps292013
Appears in Collections:(ICM) Artículos
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