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Prevalence and microdiversity of Alteromonas macleodii ‐like microorganisms in different oceanic regions
Author(s) -
GarcíaMartínez Jesús,
Acinas Silvia G.,
Massana Ramon,
RodríguezValera Francisco
Publication year - 2002
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1046/j.1462-2920.2002.00255.x
Subject(s) - biology , alteromonas , mediterranean sea , microorganism , mediterranean climate , mesopelagic zone , ecology , pelagic zone , bacteria , genetics
Summary The presence, prevalence and variability of microorganisms related to the species Alteromonas macleodii , a well known culturable γ ‐ Proteobacterium , has been studied in different seawater samples from diverse geographical locations, in both the Northern and Southern hemispheres, and tested with two molecular techniques (rRNA hybridization and gene cloning and sequencing). Results show that A. macleodii ‐like microorganisms are present in high proportions in North Atlantic and, especially, Mediterranean waters, being higher at deep samples and particle‐associated fractions, in agreement with previous findings. In contrast, Southern samples (all from very cold areas near Antarctica) presented no significant hybridization signals. The analysis of the ribosomal ITS (16S‐23S i nternal t ranscribed s pacers) revealed that A . macleodii ‐like microorganisms from Mediterranean, North Atlantic, Caribbean and Red Sea waters differed in both size and sequence, mostly depending on their geographical origin, with Mediterranean and North Atlantic clones clustering into two main groups whereas Caribbean and Red Sea clones appeared separated.