Periphyton nutrient limitation and nitrogen fixation potential along a wetland nutrient-depletion gradient

Wetlands ◽  
10.1672/18 ◽  
2005 ◽  
Vol 25 (2) ◽  
pp. 439-448 ◽  
Author(s):  
J. Thad Scott ◽  
Robert D. Doyle ◽  
Christopher T. Filstrup
Keyword(s):  
Nitrogen Fixation ◽  
Nutrient Limitation ◽  
Nutrient Depletion

Nutrient limitation of algal growth and nitrogen fixation in a tropical alpine lake, Lake Titicaca (Peru/Bolivia)

1985 ◽  
Vol 15 (2) ◽  
pp. 185-195 ◽  
Author(s):  
W. A. WURTSBAUGH ◽  
W. F. VINCENTR ◽  
R. ALFARO TAPIA ◽  
C. L. VINCENT ◽  
P.J. RICHERSON
Keyword(s):  
Nitrogen Fixation ◽  
Nutrient Limitation ◽  
Algal Growth ◽  
Alpine Lake ◽  
Lake Titicaca ◽  
Tropical Alpine

scholarly journals Nutrient limitation of terrestrial free-living nitrogen fixation

2017 ◽  
Vol 217 (3) ◽  
pp. 1050-1061 ◽  
Author(s):  
Katherine A. Dynarski ◽  
Benjamin Z. Houlton
Keyword(s):  
Nitrogen Fixation ◽  
Nutrient Limitation ◽  
Free Living

scholarly journals WAVES FOR A HYPERBOLIC KELLER–SEGEL MODEL AND BRANCHING INSTABILITIES

2011 ◽  
Vol 21 (supp01) ◽  
pp. 825-842 ◽  
Author(s):  
FIAMMETTA CERRETI ◽  
BENOÎT PERTHAME ◽  
CHRISTIAN SCHMEISER ◽  
MIN TANG ◽  
NICOLAS VAUCHELET
Keyword(s):  
Shock Wave ◽  
Bacillus Subtilis ◽  
Numerical Simulations ◽  
Nutrient Limitation ◽  
Rarefaction Wave ◽  
Hyperbolic System ◽  
Nutrient Depletion ◽  
Instability Mechanism ◽  
New Class ◽  
Rich Media

Recent experiments for swarming of the bacteria Bacillus subtilis on nutrient-rich media show that these cells are able to proliferate and spread out in colonies exhibiting complex patterns as dendritic ramifications. Is it possible to explain this process with a model that does not use local nutrient depletion? We present a new class of models which is compatible with the experimental observations and which predict branching instabilities and does not use nutrient limitation. These conclusions are based on numerical simulations. The most complex of these models is also the biologically most accurate but the essential effects can also be obtained in simplified versions which are amenable to analysis. An example of instability mechanism is the transition from a shock wave to a rarefaction wave in a reduced two by two hyperbolic system.

scholarly journals Model study on horizontal variability of nutrient N/P ratio in the Baltic Sea and its impacts on primary production, nitrogen fixation and nutrient limitation

2012 ◽  
Vol 9 (1) ◽  
pp. 385-419 ◽  
Author(s):  
Z. Wan ◽  
H. Bi ◽  
J. She ◽  
M. Maar ◽  
L. Jonasson
Keyword(s):  
Nitrogen Fixation ◽  
Primary Production ◽  
Baltic Sea ◽  
Nutrient Limitation ◽  
Inorganic Nitrogen ◽  
Fixed Ratio ◽  
Model Performance ◽  
Nutrient Concentrations ◽  
The Baltic Sea ◽  
The Baltic

Abstract. The analysis of measured nutrient concentrations suggests that the ratio of dissolved inorganic nitrogen (DIN) alteration before and after spring blooms relative to the alteration of dissolved inorganic phosphorus (DIP) remains quite constant over the years (2000~2009). This ratio differs from the Redfield ratio and varies from 6.6 : 1 to 41.5 : 1 across basins within the Baltic Sea. If the found N/P ratios are indicators of phytoplankton stoichiometry, this would affect nutrient cycles in ecosystem models. We therefore tested the effects of using horizontally variable N/P ratio instead of fixed ratio (N/P = 10 : 1 or 16 : 1) on phytoplankton uptake and remineralization in a 3-D physical-biogeochemical coupled model ERGOM. The model results using the variable N/P ratio show systematical improvements in model performance in comparison with the fixed ratios. In addition, variable N/P ratios greatly affected the model estimated primary production, nitrogen fixation and nutrient limitation, which highlights the importance of using an accurate N/P ratio.

Factors controlling nitrogen fixation in temperate seagrass beds

2015 ◽  
Vol 525 ◽  
pp. 41-51 ◽  
Author(s):  
PLM Cook ◽  
V Evrard ◽  
RJ Woodland
Keyword(s):  
Nitrogen Fixation ◽  
Seagrass Beds

NEW CLOVER CULTIVARS FOR WAIKATO DAIRY PASTURE: ESTABLISHMENT, PRODUCTION AND NITROGEN FIXATION DURING THE FIRST YEAR

1988 ◽  
pp. 207-211
Author(s):  
S.F. Ledgard ◽  
G.J. Brier ◽  
R.N. Watson
Keyword(s):  
Nitrogen Fixation ◽  
White Clover ◽  
Dairy Cow ◽  
Red Clover ◽  
First Year ◽  
Buried Seed

Clover cultivars grown with ryegrass were compared in an establishment year under dairy cow grazing. There was no difference in total annual productton but summer production was greater with Pawera red clover and with Kopu or Pitau white clovers. Clovers differed little in the proportion of nitrogen fixed, except during summer when values were highest for Pawera. Pawera was less prone to nematode attack than white clover cultivars but was more susceptible to clover rot. Resident clovers and high buried seed levels (e.g., 11-91 kg/ha) made introduction of new clover cultivars difficult. Sown clovers established best (50-70% of total clover plants) when drilled into soil treated with dicamba and glyphosate. Keywords: white clover, red clover, nematodes. nitrogen fixation, pasture renovation

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