2017
DOI: 10.3354/ame01817
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Aerobic and anaerobic ammonium oxidizers in the Cariaco Basin: distributions of major taxa and nitrogen species across the redoxcline

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Cited by 13 publications
(35 citation statements)
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“…Similarly to the salinity model above, this model can account for geometric dilution effects due to variations of the lateral basin area with depth (Samodurov et al, ). Variants of the above model have been used extensively to describe dissolved nutrient transport in Cariaco Basin (Cernadas‐Martín et al, ; Li et al, ; Scranton et al, ; Taylor et al, ), although previous studies made simplifying assumptions such as that R was negligible (Scranton et al, ), that D was constant over time (Li et al, ; Taylor et al, ), or that C was at steady state (i.e., ∂C/∂t = 0; Li et al, ; Cernadas‐Martín et al, ; Taylor et al, ). Since C has been measured and D has been previously estimated, in principle one could directly calculate the unknown rate R at various times and depths through a simple algebraic reordering of Equation (6).…”
Section: Resultsmentioning
confidence: 99%
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“…Similarly to the salinity model above, this model can account for geometric dilution effects due to variations of the lateral basin area with depth (Samodurov et al, ). Variants of the above model have been used extensively to describe dissolved nutrient transport in Cariaco Basin (Cernadas‐Martín et al, ; Li et al, ; Scranton et al, ; Taylor et al, ), although previous studies made simplifying assumptions such as that R was negligible (Scranton et al, ), that D was constant over time (Li et al, ; Taylor et al, ), or that C was at steady state (i.e., ∂C/∂t = 0; Li et al, ; Cernadas‐Martín et al, ; Taylor et al, ). Since C has been measured and D has been previously estimated, in principle one could directly calculate the unknown rate R at various times and depths through a simple algebraic reordering of Equation (6).…”
Section: Resultsmentioning
confidence: 99%
“…When integrated across all depths, estimated in situ nitrate production near the top almost exactly matches the in situ consumption of nitrate immediately below, whereas most of the oxygen consumed in the redoxcline originates from much shallower depths (<150 m, summaries in Table ). These observations are not surprising, since the main sources of oxygen are the atmosphere and primary production at the surface, while nitrate is likely largely produced by nitrifiers throughout the oxycline wherever ammonium is available and used at depth mostly as an electron acceptor for respiration (Cernadas‐Martín et al, ; Scranton et al, ; Taylor et al, ). Using negative values of R as an estimate of gross consumption rates, and integrating over all depths, we estimate a gross oxygen consumption of ∼13 mmol m −2 day −1 and a gross nitrate consumption of ∼2.6 mmol m −2 day −1 on average, indicating that oxygen is a more important terminal electron acceptor in this system than nitrate.…”
Section: Resultsmentioning
confidence: 99%
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“…Members of the MG‐I clade were also abundant in the oxycline and share a high level of identity with known ammonia‐oxidizing archaea (AOA). Cells hybridizing to Cren679, which hybridizes against the thaumarchaeal GD2 cluster within MG‐I (Labrenz et al ., ), have previously been identified using FISH in the Cariaco Basin (Cernadas‐Martín et al ., ). The archaeal MG‐III clade was also highly represented in shallow anoxic samples, where archaeal taxa distributions were strongly associated with dissolved nitrogen species.…”
Section: Discussionmentioning
confidence: 97%