Pronounced summer to winter differences and higher wintertime richness in coastal Antarctic marine bacterioplankton
Article first published online: 17 OCT 2011
© 2011 Society for Applied Microbiology and Blackwell Publishing Ltd
Volume 14, Issue 3, pages 617–629, March 2012
How to Cite
Ghiglione, J. F. and Murray, A. E. (2012), Pronounced summer to winter differences and higher wintertime richness in coastal Antarctic marine bacterioplankton. Environmental Microbiology, 14: 617–629. doi: 10.1111/j.1462-2920.2011.02601.x
- Issue published online: 5 MAR 2012
- Article first published online: 17 OCT 2011
- Received 5 March, 2011; revised 20 July, 2011; accepted 2 September, 2011.
Marine bacterioplankton studies over the annual cycle in polar systems are limited due to logistic constraints in site access and support. Here, we conducted a comparative study of marine bacterioplankton sampled at several time points over the annual cycle (12 occasions each) at sub-Antarctic Kerguelen Islands (KI) and Antarctic Peninsula (AP) coastal sites in order to establish a better understanding of the extent and nature of variation in diversity and community structure at these different latitudes (49–64S). Molecular methods targeting the 16S rRNA gene (DGGE, CE-SSCP and tag pyrosequencing) suggest a strong seasonal pattern with higher richness in winter and a clear influence of phytoplankton bloom events on bacterioplankton community structure and diversity in both locations. The distribution of sequence tags within Gammaproteobacteria, Alphaproteobacteria and Bacteriodetes differed between the two regions. At both sites, several abundant Rhodobacteraceae, uncultivated Gammaproteobacteria and Bacteriodetes-associated tags displayed intense seasonal variation often with similar trends at both sites. This enhanced understanding of variability in dominant groups of bacterioplankton over the annual cycle contributes to an expanding baseline to understand climate change impacts in the coastal zone of polar oceans and provides a foundation for comparison with open ocean polar systems.