Saturation of NO3- uptake in prairie streams as a function of acute and chronic N exposure.

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Show simple item record O'Brien, Jonathan M. Dodds, Walter K. 2011-11-04T19:18:40Z 2011-11-04T19:18:40Z 2011-11-04
dc.description.abstract We conducted a series of stepwise NO3- additions to investigate the response of NO3- uptake to short-term (acute) changes in N concentration in 3 prairie streams. Observed NO3- uptake rates increased with short-term elevations in NO3- concentration and were consistent with linear and Michaelis–Menten kinetics models. We compiled these data with uptake rates from additional published studies to calculate robust estimates of N uptake kinetics for prairie streams. Half-saturation coefficients based on compiled data were 6.7 mg/L for NH4+ and 67 mg/L for NO3- = N. This difference in halfsaturation coefficients suggests that NH4+ is more efficiently assimilated than NO3-, indicating a preference for NH4+ as an N source. Similarly, ambient concentrations of NH4+ and NO3- were less than their respective half-saturation coefficients, and aerial uptake rates were generally ,5% of the maximum, suggesting severe limitation of N uptake at ambient conditions. The observed pattern of uptake kinetics suggests that physiological constraints limit biotic N uptake in these low-N streams and contrasts with the pattern of uptake observed in streams with chronically elevated ambient NO3- concentrations. en_US
dc.relation.uri en_US
dc.rights Copyright 2010 by The North American Benthological Soceity en_US
dc.subject Nitrate uptake en_US
dc.subject Biogeochemistry en_US
dc.subject Konza Prairie en_US
dc.subject Kings Creek en_US
dc.title Saturation of NO3- uptake in prairie streams as a function of acute and chronic N exposure. en_US
dc.type Article (publisher version) en_US 2010 en_US
dc.citation.doi doi: 10.1899/09-021.1 en_US
dc.citation.epage 635 en_US
dc.citation.issue 2 en_US
dc.citation.jtitle Journal of the American Benthological Society en_US
dc.citation.spage 627 en_US
dc.citation.volume 29 en_US
dc.contributor.authoreid wkdodds en_US

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