دورية أكاديمية
Database of diazotrophs in global ocean: abundance, biomass and nitrogen fixation rates
| العنوان: | Database of diazotrophs in global ocean: abundance, biomass and nitrogen fixation rates |
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| المؤلفون: | Luo, Y.-W., Doney, S. C., Anderson, L. A., Benavides, M., Berman-Frank, I., Bode, A., Bonnet, S., Boström, K. H., Böttjer, D., Capone, D. G., Carpenter, E. J., Chen, Y. L., Church, M. J., Dore, J. E., Falcón, L. I., Fernández, A., Foster, R. A., Furuya, K., Gómez, F., Gundersen, K., Hynes, A. M., Karl, D. M., Kitajima, S., Langlois, R. J., LaRoche, J., Letelier, R. M., Marañón, E., McGillicuddy Jr., D. J., Moisander, P. H., Moore, C. M., Mouriño-Carballido, B., Mulholland, M. R., Needoba, J. A., Orcutt, K. M., Poulton, A. J., Rahav, E., Raimbault, P., Rees, A. P., Riemann, L., Shiozaki, T., Subramaniam, A., Tyrrell, T., Turk-Kubo, K. A., Varela, M., Villareal, T. A., Webb, E. A., White, A. E., Wu, J., Zehr, J. P. |
| بيانات النشر: | Copernicus Publications |
| سنة النشر: | 2012 |
| المجموعة: | Niedersächsisches Online-Archiv NOA (Gottfried Wilhelm Leibniz Bibliothek Hannover) |
| مصطلحات موضوعية: | article, Verlagsveröffentlichung |
| الوصف: | Marine N2 fixing microorganisms, termed diazotrophs, are a key functional group in marine pelagic ecosystems. The biological fixation of dinitrogen (N2) 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 N2 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 N2 fixation rate in the global ocean is estimated to be 62 (52–73) Tg N yr−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 N yr−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 N2 fixation has underestimated the true rates. As a result, one can expect that future rate measurements will shift the mean N2 fixation rate upward and may result in ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | electronic |
| اللغة: | English |
| العلاقة: | Earth System Science Data -- http://www.earth-syst-sci-data.net/volumes_and_issues.htmlTest -- http://www.bibliothek.uni-regensburg.de/ezeit/?2475469Test -- 1866-3516; https://doi.org/10.5194/essd-4-47-2012Test; https://noa.gwlb.de/receive/cop_mods_00024544Test; https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024499/essd-4-47-2012.pdfTest; https://essd.copernicus.org/articles/4/47/2012/essd-4-47-2012.pdfTest |
| DOI: | 10.5194/essd-4-47-2012 |
| الإتاحة: | https://doi.org/10.5194/essd-4-47-2012Test https://noa.gwlb.de/receive/cop_mods_00024544Test https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024499/essd-4-47-2012.pdfTest https://essd.copernicus.org/articles/4/47/2012/essd-4-47-2012.pdfTest |
| حقوق: | uneingeschränkt ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.BFF93F68 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/essd-4-47-2012 |
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