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The  Vibrionaceae  ( Vibrio ) are a ubiquitous group of metabolically flexible marine bacteria that play important roles in biogeochemical cycling in the ocean. Despite this versatility, little is known about  Vibrio  diversity and abundances in upwelling regions. The seasonal dynamics of  Vibrio  populations was examined by analysis of 16S rRNA genes in Monterey Bay (MB), California from April 2006–April 2008 at two long term monitoring stations, C1 and M2.  Vibrio  phylotypes within MB were diverse, with subpopulations clustering with several different cultured representatives including  Allivibrio  spp.,  Vibrio penaecida , and  Vibrio splendidus  as well as with many unidentified marine environmental bacterial 16S rRNA gene sequences. Total  Vibrio  population abundances, as well as abundances of a  Vibrio  sp. subpopulation (MBAY Vib7) and an  Allivibrio  sp. subpopulation (MBAY Vib4) were examined in the context of environmental parameters from mooring station and CTD cast data. Total  Vibrio  populations showed some seasonal variability but greater variability was observed within the two subpopulations. MBAY Vib4 was negatively associated with MB upwelling indices and positively correlated with oceanic season conditions, when upwelling winds relax and warmer surface waters are present in MB. MBAY Vib7 was also negatively associated with upwelling indices and represented a deeper  Vibrio  sp. population. Correlation patterns suggest that larger oceanographic conditions affect the dynamics of the populations in MB, rather than specific environmental factors. This study is the first to target and describe the diversity and dynamics of these natural populations in MB and demonstrates that these populations shift seasonally within the region.

Vibrio diversity and dynamics in the Monterey Bay upwelling region