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  • Luo, Y. -WWoods Hole Oceanog Inst, USA (author)

Database of diazotrophs in global ocean : abundance, biomass and nitrogen fixation rates

  • Article/chapterEnglish2012

Publisher, publication year, extent ...

  • 2012-08-31
  • Copernicus GmbH,2012
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:lnu-70917
  • https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70917URI
  • https://doi.org/10.5194/essd-4-47-2012DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Marine N-2 fixing microorganisms, termed di-azotrophs, are a key functional group in marine pelagic ecosystems. The biological fixation of dinitrogen ( N-2) to bioavailable nitrogen provides an important new source of nitrogen for pelagic marine ecosystems and influences primary productivity and organic matter export to the deep ocean. As one of a series of efforts to collect biomass and rates specific to different phytoplankton functional groups, we have constructed a database on diazotrophic organisms in the global pelagic upper ocean by compiling about 12 000 direct field measurements of cyanobacterial diazotroph abundances (based on microscopic cell counts or qPCR assays targeting the nifH genes) and N-2 fixation rates. Biomass conversion factors are estimated based on cell sizes to convert abundance data to diazotrophic biomass. The database is limited spatially, lacking large regions of the ocean especially in the Indian Ocean. The data are approximately log-normal distributed, and large variances exist in most sub-databases with non-zero values differing 5 to 8 orders of magnitude. Reporting the geometric mean and the range of one geometric standard error below and above the geometric mean, the pelagic N-2 fixation rate in the global ocean is estimated to be 62 (52-73) Tg Nyr(-1) and the pelagic diazotrophic biomass in the global ocean is estimated to be 2.1 (1.4-3.1) Tg C from cell counts and to 89 (43-150) Tg C from nifH- based abundances. Reporting the arithmetic mean and one standard error instead, these three global estimates are 140 +/- 9.2 Tg Nyr(-1), 18 +/- 1.8 Tg C and 590 +/- 70 Tg C, respectively. Uncertainties related to biomass conversion factors can change the estimate of geometric mean pelagic diazotrophic biomass in the global ocean by about +/- 70 %. It was recently established that the most commonly applied method used to measure N-2 fixation has underestimated the true rates. As a result, one can expect that future rate measurements will shift the mean N-2 fixation rate upward and may result in significantly higher estimates for the global N-2 fixation. The evolving database can nevertheless be used to study spatial and temporal distributions and variations of marine N-2 fixation, to validate geochemical estimates and to parameterize and validate biogeochemical models, keeping in mind that future rate measurements may rise in the future.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Doney, S. C.Woods Hole Oceanog Inst, USA (author)
  • Anderson, L. A.Woods Hole Oceanog Inst, USA (author)
  • Benavides, M.Univ Las Palmas Gran Canaria, Spain (author)
  • Berman-Frank, I.Bar Ilan Univ, Israel (author)
  • Bode, A.Ctr Oceanog A Coruna, Spain (author)
  • Bonnet, S.Aix Marseille Univ, France (author)
  • Boström, Kjärstin H,1966-Linnéuniversitetet,Institutionen för naturvetenskap, NV(Swepub:lnu)nhakj (author)
  • Boettjer, D.Univ Hawaii, USA (author)
  • Capone, D. G.Univ So Calif, USA (author)
  • Carpenter, E. J.San Francisco State Univ, USA (author)
  • Chen, Y. L.Natl Sun Yat Sen Univ, Taiwan (author)
  • Church, M. J.Univ Hawaii, USA (author)
  • Dore, J. E.Montana State Univ, USA (author)
  • Falcon, L. I.Univ Nacl Autonoma Mexico, Mexico (author)
  • Fernandez, A.Univ Vigo, Spain (author)
  • Foster, R. A.Max Planck Inst Marine Mikrobiol, Germany (author)
  • Furuya, K.Univ Tokyo, Japan (author)
  • Gomez, F.Univ Valencia, Spain (author)
  • Gundersen, K.Univ So Mississippi, USA (author)
  • Hynes, A. M.Woods Hole Oceanog Inst, USA (author)
  • Karl, D. M.Univ Hawaii, USA (author)
  • Kitajima, S.Univ Tokyo, Japan (author)
  • Langlois, R. J.Leibniz Inst Marine Sci, Germany (author)
  • LaRoche, J.Leibniz Inst Marine Sci, Germany (author)
  • Letelier, R. M.Oregon State Univ, USA (author)
  • Maranon, E.Univ Vigo, Spain (author)
  • McGillicuddy, D. J., Jr.Woods Hole Oceanog Inst, USA (author)
  • Moisander, P. H.Univ Calif Santa Cruz, USA (author)
  • Moore, C. M.Univ Southampton, England (author)
  • Mourino-Carballido, B.Univ Vigo, Spain (author)
  • Mulholland, M. R.Old Domin Univ, USA (author)
  • Needoba, J. A.Oregon Hlth & Sci Univ, USA (author)
  • Orcutt, K. M.Univ So Mississippi, USA (author)
  • Poulton, A. J.Nat Oceanog Ctr, UK (author)
  • Rahav, E.Bar Ilan Univ, Israel (author)
  • Raimbault, P.Aix Marseille Univ, France (author)
  • Rees, A. P.Plymouth Marine Lab, UK (author)
  • Riemann, L.Univ Copenhagen, Denmark (author)
  • Shiozaki, T.Univ Tokyo, Japan (author)
  • Subramaniam, A.Lamont Doherty Earth Observ, USA (author)
  • Tyrrell, T.Univ Southampton, UK (author)
  • Turk-Kubo, K. A.Univ Calif Santa Cruz, USA (author)
  • Varela, M.Ctr Oceanog A Coruna, Spain (author)
  • Villareal, T. A.Univ Texas Austin, USA (author)
  • Webb, E. A.Univ So Calif, USA (author)
  • White, A. E.Oregon State Univ, USA (author)
  • Wu, J.Univ Miami, USA (author)
  • Zehr, J. P.Univ Calif Santa Cruz, USA (author)
  • Woods Hole Oceanog Inst, USAUniv Las Palmas Gran Canaria, Spain (creator_code:org_t)

Related titles

  • In:Earth System Science Data: Copernicus GmbH4:1, s. 47-731866-35081866-3516

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