Microbial Nitrogen Fixation in the Intestine of Tipulidae Tipula maxima Larvae

2020 ◽  
Vol 47 (1) ◽  
pp. 35-39
Author(s):  
N. V. Kostina ◽  
A. N. Chernysheva ◽  
M. V. Vecherskii ◽  
T. A. Kuznetsova
Keyword(s):  
Nitrogen Fixation ◽  
Microbial Nitrogen

scholarly journals Microbial nitrogen cycling on the Greenland Ice Sheet

2011 ◽  
Vol 8 (5) ◽  
pp. 10423-10457 ◽  
Author(s):  
J. Telling ◽  
M. Stibal ◽  
A. M. Anesio ◽  
M. Tranter ◽  
I. Nias ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Cycling ◽  
Microbial Growth ◽  
Inorganic Nitrogen ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Available Nitrogen ◽  
Microbial Nitrogen ◽  
Nitrogen Demand

Abstract. Microbial nitrogen cycling was investigated along a 79 km transect into the Greenland Ice Sheet (GrIS) in early August 2010. The depletion of dissolved nitrate and production of ammonium (relative to icemelt) in cryoconite holes within 7.5 km of the ice sheet margin suggested microbial uptake and ammonification respectively. Nitrogen fixation (<4.2 μmoles C2H4 m−2 day−1 to 16.3 μmoles C2H4 m−2 day−1) was active in some cryoconite holes at sites up to 5.7 km from the ice sheet margin, with nitrogen fixation inversely correlated to concentrations of inorganic nitrogen. There may be the potential for the zone of nitrogen fixation to progressively extend further into the interior of the GrIS as the melt season progresses as reserves of available nitrogen are depleted. Estimated annual inputs of nitrogen from nitrogen fixation along the transect were at least two orders of magnitude lower than inputs from precipitation, with the exception of a 100 m long marginal debris-rich zone where nitrogen fixation could potentially equal or exceed that of precipitation. The average estimated contribution of nitrogen fixation to the nitrogen demand of net microbial growth at sites along the transect ranged from 0% to 17.5%.

scholarly journals Assessing the effects of iron enrichment across holobiont compartments reveals reduced microbial nitrogen fixation in the Red Sea coralPocillopora verrucosa

2017 ◽  
Vol 7 (16) ◽  
pp. 6614-6621 ◽  
Author(s):  
Nils Rädecker ◽  
Claudia Pogoreutz ◽  
Maren Ziegler ◽  
Ananya Ashok ◽  
Marcelle M. Barreto ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Red Sea ◽  
Iron Enrichment ◽  
Microbial Nitrogen

Microbial nitrogen fixation in the gastro-intestinal tract of Kalmykia gerbils (M. tamariscinus and Meriones meridianus)

2010 ◽  
Vol 37 (5) ◽  
pp. 476-479 ◽  
Author(s):  
T. A. Kuznetsova ◽  
N. V. Kostina ◽  
E. I. Naumova ◽  
M. M. Umarov
Keyword(s):  
Nitrogen Fixation ◽  
Intestinal Tract ◽  
Microbial Nitrogen ◽  
Gastro Intestinal Tract

scholarly journals Microbial nitrogen fixation and methane oxidation are strongly enhanced by light in Sphagnum mosses

AMB Express ◽  
2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Martine A. R. Kox ◽  
Eva van den Elzen ◽  
Leon P. M. Lamers ◽  
Mike S. M. Jetten ◽  
Maartje A. H. J. van Kessel
Keyword(s):  
Nitrogen Fixation ◽  
Methane Oxidation ◽  
Sphagnum Mosses ◽  
Microbial Nitrogen

scholarly journals Microbial nitrogen cycling on the Greenland Ice Sheet

2012 ◽  
Vol 9 (7) ◽  
pp. 2431-2442 ◽  
Author(s):  
J. Telling ◽  
M. Stibal ◽  
A. M. Anesio ◽  
M. Tranter ◽  
I. Nias ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Cycling ◽  
Marginal Zone ◽  
Inorganic Nitrogen ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Nitrogen Budget ◽  
Minor Importance ◽  
Microbial Nitrogen ◽  
Nitrogen Inputs

Abstract. Nitrogen inputs and microbial nitrogen cycling were investigated along a 79 km transect into the Greenland Ice Sheet (GrIS) during the main ablation season in summer 2010. The depletion of dissolved nitrate and production of ammonium (relative to icemelt) in cryoconite holes on Leverett Glacier, within 7.5 km of the ice sheet margin, suggested microbial uptake and ammonification respectively. Positive in situ acetylene assays indicated nitrogen fixation both in a debris-rich 100 m marginal zone and up to 5.7 km upslope on Leverett Glacier (with rates up to 16.3 μmoles C2H4 m−2 day−1). No positive acetylene assays were detected > 5.7 km into the ablation zone of the ice sheet. Potential nitrogen fixation only occurred when concentrations of dissolved and sediment-bound inorganic nitrogen were undetectable. Estimates of nitrogen fluxes onto the transect suggest that nitrogen fixation is likely of minor importance to the overall nitrogen budget of Leverett Glacier and of negligible importance to the nitrogen budget on the main ice sheet itself. Nitrogen fixation is however potentially important as a source of nitrogen to microbial communities in the debris-rich marginal zone close to the terminus of the glacier, where nitrogen fixation may aid the colonization of subglacial and moraine-derived debris.

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