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  • *Seawater/chemistry/microbiology  (1)
  • Amazon river  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    15N natural abundance in plants of the Amazon River floodplain and potential atmospheric N2 fixation (1992)
    Springer
    Oecologia 90 (1992), S. 591-596 
    Details
    ISSN: 1432-1939
    Keywords: 15N ; Atmospheric nitrogen fixation ; Floodplain ; Amazon river
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The15N natural abundance values of various Amazon floodplain (várzea) plants was investigated. Samples of young leaf tissues were collected during three different periods of the river hydrography (low water, mid rising water and high water) and during one period in the Madeira River (high water). A large variation of15N abundance was observed, both among the different plant types and between the different flood stages. This variation probably, reflected, in part, the highly variable nature of the floodplain, sometimes dry and oxygenated and at other times inundated and anaerobic and, in part, changes in plant nitrogen metabolism. Comparison of the nitrogen isotopic composition of leguminous plants with that of non-leguminous plants showed that, on average, the15N abundance was lower in the legumes than non-legumes, suggesting active N-fixation. Also, the15N natural abundance in aquatic grasses of the generaPaspalum, was in general, lower than the15N abundance of aquatic grasses of the generaEchinochloa. As both of these grasses grow in the same general habitat, it appears thatPaspalum grasses may also be nitrogen fixers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01875455
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    Paper (German National Licenses)
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  • 2
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    Organic matter stoichiometry, flux, and oxygen control nitrogen loss in the ocean (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-04-26
    Description: Biologically available nitrogen limits photosynthesis in much of the world ocean. Organic matter (OM) stoichiometry had been thought to control the balance between the two major nitrogen removal pathways-denitrification and anammox-but the expected proportion of 30% anammox derived from mean oceanic OM is rarely observed in the environment. With incubations designed to directly test the effects of stoichiometry, however, we showed that the ratio of anammox to denitrification depends on the stoichiometry of OM supply, as predicted. Furthermore, observed rates of nitrogen loss increase with the magnitude of OM supply. The variable ratios between denitrification and anammox previously observed in the ocean are thus attributable to localized variations in OM quality and quantity and do not necessitate a revision to the global nitrogen cycle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Babbin, Andrew R -- Keil, Richard G -- Devol, Allan H -- Ward, Bess B -- New York, N.Y. -- Science. 2014 Apr 25;344(6182):406-8. doi: 10.1126/science.1248364. Epub 2014 Apr 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geosciences, Princeton University, Guyot Hall, Princeton, NJ 08544, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24763588" target="_blank"〉PubMed〈/a〉
    Keywords: Ammonium Compounds/analysis/metabolism ; Anaerobiosis ; Bacteria/metabolism ; Denitrification ; Nitrites/analysis/metabolism ; Nitrogen/*analysis/metabolism ; Nitrogen Cycle ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/*analysis/metabolism ; *Seawater/chemistry/microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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