Biogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red Sea

Handle URI:
http://hdl.handle.net/10754/561950
Title:
Biogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red Sea
Authors:
Ngugi, David ( 0000-0002-0442-4279 ) ; Antunes, Andre ( 0000-0001-7668-9842 ) ; Brune, Andreas; Stingl, Ulrich ( 0000-0002-0684-2597 )
Abstract:
The 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.
KAUST Department:
Red Sea Research Center (RSRC); Biological and Environmental Sciences and Engineering (BESE) Division; Marine Science Program; Marine Microbial Ecology Research Group
Publisher:
Wiley-Blackwell
Journal:
Molecular Ecology
Issue Date:
1-Dec-2011
DOI:
10.1111/j.1365-294X.2011.05378.x
PubMed ID:
22133021
Type:
Article
ISSN:
09621083
Appears in Collections:
Articles; Red Sea Research Center (RSRC); Marine Science Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorNgugi, Daviden
dc.contributor.authorAntunes, Andreen
dc.contributor.authorBrune, Andreasen
dc.contributor.authorStingl, Ulrichen
dc.date.accessioned2015-08-03T09:34:49Zen
dc.date.available2015-08-03T09:34:49Zen
dc.date.issued2011-12-01en
dc.identifier.issn09621083en
dc.identifier.pmid22133021en
dc.identifier.doi10.1111/j.1365-294X.2011.05378.xen
dc.identifier.urihttp://hdl.handle.net/10754/561950en
dc.description.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.en
dc.publisherWiley-Blackwellen
dc.subject16S rRNAen
dc.subjectbacteriaen
dc.subjectbiogeographyen
dc.subjectoperational taxonomic uniten
dc.subjectProchlorococcusen
dc.subjectpyrosequencingen
dc.subjectRed Seaen
dc.subjectSAR11en
dc.titleBiogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red Seaen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentMarine Science Programen
dc.contributor.departmentMarine Microbial Ecology Research Groupen
dc.identifier.journalMolecular Ecologyen
dc.contributor.institutionDepartment of Biogeochemistry, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse 10, D-35043 Marburg, Germanyen
kaust.authorNgugi, Daviden
kaust.authorAntunes, Andreen
kaust.authorStingl, Ulrichen
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