High rates of N2 fixation by unicellular diazotrophs in the oligotrophic Pacific Ocean

By J. Montoya, C. Holl, Jonathan P. Zehr, A. Hansen, Tracy A. Villareal, D. Capone. Nature, 2004

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Citations in the corpus

Inter‐annual recurrence of archaeal assemblages in the coastal NW Mediterranean Sea (Blanes Bay Microbial Observatory) (2010, background): “Microbes occurring in low numbers can be functionally important, as shown earlier for nitrogen-fixing bacteria (Montoya et al. 2004) or hydrocarbon-degrading organisms (Teira et al. 2007).”
Physical forcing of nitrogen fixation and diazotroph community structure in the North Pacific subtropical gyre (2009, background): “... mm plankton biomass averaged 84 ± 49 m mol Nm � 2 d � 1 while rates of N2 fixation in whole seawater samples averaged 113 ± 66 m mol Nm � 2 d � 1 .O n the basis of both indirect approaches (geochemical mass balances) and direct measurements a number of previous studies in the NPSG have estimated”
Competition and facilitation between unicellular nitrogen‐fixing cyanobacteria and non—nitrogen‐fixing phytoplankton species (2007, background): “…and facilitation offers an intriguing explanation for the observa- tion that unicellular nitrogen-fixing cyanobacteria are often subordinate or co-dominant species in phytoplankton communities (Zehr et al. 2001; Mazard et al. 2004; Montoya et al. 2004), but seldom fully dominate the ecosystem.”
Influence of the Amazon River plume on distributions of free‐living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean (2007, background): “…unicellular cyanobacterial types, since only Group B types have been cultivated (related to Crocosphaera watsonii WH8501) and most reports of diazotrophic unicellular cyanobacteria abundances are from the subtropical North Pacific Ocean (Zehr et al. 2001b; Montoya et al. 2004; Church et al. 2005a).”
The fate of nitrogen fixed by diazotrophs in the ocean (2007, background): “…recent discoveries of diazotrophic unicellular cyanobacteria and bacterioplankton in marine systems (e.g., Zehr et al., 2001; Falcón et al., 2004; Montoya et al., 2004) suggest that there are additional sources of N2 fixation that may yet reconcile measurements with geochemically predicted…”
Nitrogen fixation and release of fixed nitrogen by Trichodesmium spp. in the Gulf of Mexico (2006, background): “If we consider that unicells might fix for 24 h a day (e.g., Montoya et al. 2004), then daily fixation rates range from 0.27 to 5.62 nmol N L21 d21.”
Evidence of active dinitrogen fixation in surface waters of the eastern tropical South Pacific during El Niño and La Niña events and evaluation of its potential nutrient controls (2013, result): “These rates are comparable to those measured in other oligotrophic areas of the ocean (Table 2) such as the North Pacific gyre [Montoya et al., 2004] or the tropical Atlantic [Voss et al., 2004; Capone et al., 2005].”
Evidence for efficient regenerated production and dinitrogen fixation in nitrogen-deficient waters of the South Pacific Ocean: impact on new and export production estimates (2008, background): “…during this cruise, we can postulate that N2-fixation was executed by nanoplanktonic and picoplanktonic organisms, recently revealed by new molecular biological techniques (Zehr et al., 1998, 2000) and by direct measurements (Montoya et al., 2004; Garcia et al., 2007; Biegala and Raimbault, 2008).”
Seasonality of N2 fixation and nifH gene diversity in the Gulf of Aqaba (Red Sea) (2009, methodology): “Our initial conclusion was that at such low rates, it would be better to increase the incubation volume to 4.5 liters and the incubation time to 48 h, as others have used these conditions in similar field experiments (Montoya et al. 2004; Needoba et al. 2007; Zehr et al. 2007).”
Stable isotopic evidence for trophic groupings and bio-regionalization of predators and their prey in oceanic waters off eastern Australia (2009, background): “At times, northern Australian waters are known to exhibit high rates of nitrogen fixation due to the common presence of Trichodesmium sp. (Revelante et al. 1982) and unicellular diazotrophs ( Montoya et al. 2004 ).”
Nitrogen fixation in the western equatorial Pacific: Rates, diazotrophic cyanobacterial size class distribution, and biogeochemical significance (2009, background): “This result is consistent with the emergent recognition that unicellular nitrogen-fixing organisms can make a larger contribution to marine nitrogen fixers than previously thought [Zehr et al., 2001; Montoya et al., 2004 ], which appears to be particularly true in the tropical Pacific [Church et al”
Carbon export mediated by mesopelagic fishes in the northeast Pacific Ocean (2013, background): “, 2011; but the authors attribute it to terrestrial sources), and that nitrogen fixation at depths below those observed by satellites plays a larger role in the oligotrophic eastern North Pacific than previously believed (Montoya et al., 2004), supporting the possibility that NPP is underestimated h”