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Biogeography of the ubiquitous marine bacterium Alteromonas macleodii determined by multilocus sequence analysis
Author(s) -
IVARSMARTÍNEZ ELENA,
D’AURIA GIUSEPPE,
RODRÍGUEZVALERA FRANCISCO,
SÁNCHEZPORRO CRISTINA,
VENTOSA ANTONIO,
JOINT IAN,
MÜHLING MARTIN
Publication year - 2008
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.2008.03883.x
Subject(s) - biology , alteromonas , phylogenetic tree , marine bacteriophage , intraspecific competition , plankton , prophage , genetics , phylogenetics , evolutionary biology , ecology , gene , bacteria , escherichia coli , bacteriophage
Twenty‐three isolates of the widely distributed marine bacteria Alteromonas macleodii have been analysed by multilocus sequence analysis combined with phylogenetic and multivariate statistical analyses. The strains originated from the Pacific Ocean, Mediterranean Sea, English Channel, Black Sea and Thailand. Using the nucleotide sequences of nine loci for each of the 23 isolates, a robust identification was achieved of different clades within the single species. Strains generally clustered with the depth in the water column from which the isolate originated. Strains also showed more recombination with isolates from the same vicinity, suggesting that genetic exchange plays a role in diversification of planktonic marine prokaryotes. This study thus shows for the first time for a large set of isolates of a species of planktonic marine prokaryotes that multilocus sequence analysis overcomes the problems associated with the analysis of individual marker genes or presence of extensive recombination events. It can thus achieve intraspecific identification to the level of genotypes and, by comparison with relevant environmental data, ecotypes.