Biogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red Sea
KAUST DepartmentRed Sea Research Center (RSRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Marine Science Program
Marine Microbial Ecology Research Group
Online Publication Date2011-12-01
Print Publication Date2012-01
Permanent link to this recordhttp://hdl.handle.net/10754/561950
MetadataShow full item record
AbstractThe Red Sea is a unique marine ecosystem with contrasting gradients of temperature and salinity along its north-to-south axis. It is an extremely oligotrophic environment that is characterized by perpetual year-round water column stratification, high annual solar irradiation, and negligible riverine and precipitation inputs. In this study, we investigated whether the contemporary environmental conditions shape community assemblages by pyrosequencing 16S rRNA genes of bacteria in surface water samples collected from the northeastern half of this water body. A combined total of 1855 operational taxonomic units (OTUs) were recovered from the 'small-cell' and 'large-cell' fractions. Here, a few major OTUs affiliated with Cyanobacteria and Proteobacteria accounted for â93% of all sequences, whereas a tail of 'rare' OTUs represented most of the diversity. OTUs allied to Surface 1a/b SAR11 clades and Prochlorococcus related to the high-light-adapted (HL2) ecotype were the most widespread and predominant sequence types. Interestingly, the frequency of taxa that are typically found in the upper mesopelagic zone was significantly elevated in the northern transects compared with those in the central, presumably as a direct effect of deep convective mixing in the Gulf of Aqaba and water exchange with the northern Red Sea. Although temperature was the best predictor of species richness across all major lineages, both spatial and environmental distances correlated strongly with phylogenetic distances. Our results suggest that the bacterial diversity of the Red Sea is as high as in other tropical seas and provide evidence for fundamental differences in the biogeography of pelagic communities between the northern and central regions. © 2011 Blackwell Publishing Ltd.
- Allochthonous inputs of riverine picocyanobacteria to coastal waters in the Arctic Ocean.
- Authors: Waleron M, Waleron K, Vincent WF, Wilmotte A
- Issue date: 2007 Feb
- Bacterial diversity in the oxygen minimum zone of the eastern tropical South Pacific.
- Authors: Stevens H, Ulloa O
- Issue date: 2008 May
- Diversity of rare and abundant bacteria in surface waters of the Southern Adriatic Sea.
- Authors: Quero GM, Luna GM
- Issue date: 2014 Oct
- Molecular analyses of the diversity in marine bacterioplankton assemblages along the coastline of the northeastern Gulf of Mexico.
- Authors: Olapade OA
- Issue date: 2010 Oct
- Combined analyses of the ITS loci and the corresponding 16S rRNA genes reveal high micro- and macrodiversity of SAR11 populations in the Red Sea.
- Authors: Ngugi DK, Stingl U
- Issue date: 2012