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

Sala, Maria Montserrat and Arin, Laura and Balague, Vanessa and Felipe, Jordi and Guadayol, Oscar and Vaque, Dolors (2005) Functional diversity of bacterioplankton assemblages in western Antarctic seawaters during late spring. Marine Ecology Progress Series, 292 . pp. 13-21. ISSN 0171-8630

Documents
Functional diversity of bacterioplankton assemblages in western Antarctic seawaters during late spring
[img]
[Download]
[img]
Preview
PDF
sala_etal_05.pdf - Whole Document

313kB
Item Type:Article
Item Status:Live Archive

Abstract

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.

Keywords:functional diversity, biolog, aminopeptidase, ectoenzyme, bacterial activity
Subjects:C Biological Sciences > C180 Ecology
F Physical Sciences > F700 Ocean Sciences
C Biological Sciences > C500 Microbiology
Divisions:College of Science > School of Life Sciences
Related URLs:
ID Code:16480
Deposited On:13 Feb 2015 12:12

Repository Staff Only: item control page