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Comparative analysis of bacterioplankton assemblages from maritime Antarctic freshwater lakes with contrasting trophic status

AuthorsSchiaffino, M. Romina; Unrein, Fernando ; Gasol, Josep M. ; Farias, M. E.; Estevez, Cristina; Balagué, Vanessa ; Izaguirre, Irina
KeywordsMaritim Antarctic Lakes
16S rRNA
Denaturing gradient gel electrophoresis
Hope Bay
Potter Peninsula
Antarctic Peninsula
King George Island
Issue Date13-Mar-2009
CitationPolar Biology 32(6): 923-936 (2009)
AbstractThe bacterioplankton assemblages of eight maritime Antarctic lakes with a wide range of trophic status and geographic span (six lakes from Hope Bay, Antarctic Peninsula and two from Potter Peninsula, King George Island) were described using denaturing gradient gel electrophoresis and band sequencing during two consecutive austral summers (2003–2004). Analyses of the gels identi- Wed a total of 230 bands spread across 57 diVerent positions. Among those bands, 14 were shared between lakes from Hope Bay and Potter Peninsula, 17 were observed only in particular lakes, and 17 were registered both years in the same lake. We successfully reampliWed and sequenced 43 bands located in 36 diVerent positions belonging to Bacteroidetes, Actinobacteria, Betaproteobacteria and Cyanobacteria. The closest matches for 63% of the sequenced bands were from Antarctic or from other cold environment clones and sequences already in the databases, suggesting the widespread dominance of microbial communities adapted to cold habitats. The results of the multivariate analyses (Cluster Analysis and CCA) indicated that the nutrient status of the lake inXuences the bacterioplankton assemblages
Description14 pages, 5 tables
Publisher version (URL)https://doi.org/10.1007/s00300-009-0593-6
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