PMID- 18266758
OWN - NLM
STAT- MEDLINE
DCOM- 20080513
LR  - 20131121
IS  - 1462-2920 (Electronic)
IS  - 1462-2912 (Linking)
VI  - 10
IP  - 4
DP  - 2008 Apr
TI  - Shifts in the relative abundance of ammonia-oxidizing bacteria and archaea across 
      physicochemical gradients in a subterranean estuary.
PG  - 1068-79
LID - 10.1111/j.1462-2920.2007.01547.x [doi]
AB  - Submarine groundwater discharge to coastal waters can be a significant source of 
      both contaminants and biologically limiting nutrients. Nitrogen cycling across 
      steep gradients in salinity, oxygen and dissolved inorganic nitrogen in sandy 
      'subterranean estuaries' controls both the amount and form of nitrogen discharged 
      to the coastal ocean. We determined the effect of these gradients on 
      betaproteobacterial ammonia-oxidizing bacteria (beta-AOB) and ammonia-oxidizing 
      archaea (AOA) in a subterranean estuary using the functional gene encoding 
      ammonia monooxygenase subunit A (amoA). The abundance of beta-AOB was 
      dramatically lower in the freshwater stations compared with saline stations, 
      while AOA abundance remained nearly constant across the study site. This 
      differing response to salinity altered the ratio of beta-AOB to AOA such that 
      bacterial amoA was 30 times more abundant than crenarchaeal amoA at the oxic 
      marine station, but nearly 10 times less abundant at the low-oxygen fresh and 
      brackish stations. As the location of the brackish mixing zone within the aquifer 
      shifted from landward in winter to oceanward in summer, the location of the 
      transition from a beta-AOB-dominated to an AOA-dominated community also shifted, 
      demonstrating the intimate link between microbial communities and coastal 
      hydrology. Analysis of ammonia-oxidizing enrichment cultures at a range of 
      salinities revealed that AOA persisted solely in the freshwater enrichments where 
      they actively express amoA. Diversity (as measured by total richness) of 
      crenarchaeal amoA was high at all stations and time points, in sharp contrast to 
      betaproteobacterial amoA for which only two sequence types were found. These 
      results offer new insights into the ecology of AOA and beta-AOB by elucidating 
      conditions that may favour the numerical dominance of beta-AOB over AOA in 
      coastal sediments.
FAU - Santoro, Alyson E
AU  - Santoro AE
AD  - Department of Civil and Environmental Engineering, Stanford University, Stanford, 
      CA 94305, USA. asantoro@stanford.edu
FAU - Francis, Christopher A
AU  - Francis CA
FAU - de Sieyes, Nicholas R
AU  - de Sieyes NR
FAU - Boehm, Alexandria B
AU  - Boehm AB
LA  - eng
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PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20080203
PL  - England
TA  - Environ Microbiol
JT  - Environmental microbiology
JID - 100883692
RN  - 0 (Inorganic Chemicals)
RN  - 7664-41-7 (Ammonia)
RN  - EC 1.- (Oxidoreductases)
RN  - EC 1.7.3.- (ammonia monooxygenase)
RN  - N762921K75 (Nitrogen)
RN  - S88TT14065 (Oxygen)
SB  - IM
MH  - Ammonia/*metabolism
MH  - Archaea/genetics/*isolation & purification/metabolism
MH  - Betaproteobacteria/genetics/*isolation & purification/metabolism
MH  - California
MH  - *Ecosystem
MH  - Fresh Water/analysis/*microbiology
MH  - Genes, Archaeal
MH  - Genes, Bacterial
MH  - Geologic Sediments/analysis/*microbiology
MH  - Inorganic Chemicals/metabolism
MH  - Molecular Sequence Data
MH  - Nitrogen/metabolism
MH  - Oxidoreductases/genetics
MH  - Oxygen/metabolism
MH  - Salinity
MH  - Seawater/analysis/*microbiology
MH  - *Soil Microbiology
MH  - *Water Microbiology
EDAT- 2008/02/13 09:00
MHDA- 2008/05/14 09:00
CRDT- 2008/02/13 09:00
PHST- 2008/02/13 09:00 [pubmed]
PHST- 2008/05/14 09:00 [medline]
PHST- 2008/02/13 09:00 [entrez]
AID - EMI1547 [pii]
AID - 10.1111/j.1462-2920.2007.01547.x [doi]
PST - ppublish
SO  - Environ Microbiol. 2008 Apr;10(4):1068-79. doi: 10.1111/j.1462-2920.2007.01547.x. 
      Epub 2008 Feb 3.