The kinetics of nitrate and ammonia uptake by natural populations of marine phytoplankton

MacIsaac, J.J.; Dugdale, Richard C.

doi:10.1016/0011-7471(69)90049-7

Cited by 158 publications

(106 citation statements)

References 11 publications

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“…data). MacIsaac and Dugdale (1969) were among the first to show that the K,-N03-values of oceanic phytoplankton were significantly lower in oligotrophic than in more eutrophic regions, suggesting that phytoplankton is more efficient at assimilating nitrogen at low ambient nutrient levels.…”

Section: Discussionmentioning

confidence: 85%

“…take rates are always < V,,,. According to MacIsaac and Dugdale (1969) these concentrations can be considered limiting for uptake, and, indeed at all times, rates of References ammonium and nitrate uptake were regulated by substrate availability. The presence AXLER, R.P.,R.M.…”

Section: Discussionmentioning

confidence: 99%

“…low half-saturation constants for nitrate and ammonium assimilation (MacIsaac and Dugdale 1969;Eppley et al 1969;Axler et al 1982); phytoplankton primary production is maintained by efficient use of internally regenerated ammonium (Dugdale and Goering 1967;Axler et al 1982); ammonium is generally utilized in preference to nitrate even at low substrate concentrations (Conway 1977;McCarthy 198 1); and light is important in influencing the relative use l Research support was provided by NSF grants DEB 78-23824 and DEB 80-19918 to C. R. Goldman. of the various DIN sources (Eppley et al 1971;Healey 1973).…”

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confidence: 99%

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Inorganic nitrogen uptake by epilithic periphyton in a N‐deficient lake1

Reuter

Loeb

Goldman

1986

Limnology & Oceanography

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Seasonal patterns of dissolved inorganic nitrogen and inorganic carbon uptake by the sublittoral epilithic periphyton community in N-deficient, oligotrophic Lake Tahoe were examined. The biomass dominants of this community, N,-fixing blue-green algae (e.g. Calothrix, Tolypothrix, and Nostoc) were persistent and retained their nitrogenase activity throughout the year. Seasonal rates of N, fixation exhibited considerable variation, with a distinct summer maximum and winter minimum. Uptake of both N03-and NH4+ followed Michaelis-Menten kinetics. K, values were typically extremely high (> 100 pg N liter-l) compared to the ambient concentrations of these forms of nitrogen (< 10 pg N liter-l). N, fixation was the most important source of inorganic N to the yearly N budget of this benthic community. Low ambient substrate concentrations coupled with a low physiological affinity for these substrates at ambient levels were responsible for the relative unimportance of N03-and NH,+ uptake. Dark uptake of N03-, NH4+, and N, fixation were all significant and could not be neglected in determining rates of daily inorganic nitrogen utilization. This blue-green algal community is not adapted for efficient use of N03-or NH,+ and can survive in the N-deficient environment because of its ability to use N,. In striking contrast, the phytoplankton in Lake Tahoe has no N,-fixing organisms and depends on NO,-and NH,+ for its production.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Inorganic nitrogen uptake by epilithic periphyton in a N‐deficient lake1

Reuter

Loeb

Goldman

1986

Limnology & Oceanography

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“…(At first sight this seems incorrect for the substrate enters into the quantities y-coordinates also, but when isotopes are used to study the procedure the dilution of the isotope by the substrate present automatically compensates : Wright and Hobbie 1966.) Wright and Hobbie (1966), Vaccaro and Jannasch (1966), Hobbie et al (1968), and MacIsaac and Dugdale (1969) give information on the relative values of K and the substrate concentration.…”

Section: Discussionmentioning

confidence: 99%

“…In ecology the kinetic equation has been used to study complex phenomena such as rate of uptake of organic and inorganic nutrients by natural populations (Parsons and Strickland 1962;Wright and Hobbie 1966;Dugdale 1967;MacIsaac and Dugdale 1969;Williams and Gray 1970). This sort of analysis is instructive if the equation is obeyed, but if the results do not appear to adhere to the equation, as has happened in some studies of heterotrophic processes (e.g.…”

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confidence: 99%

The validity of the application of simple kinetic analysis to heterogeneous microbial populations1

Williams

1973

Limnology & Oceanography

121

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It is shown by use of a mathematical model that heterogeneous populations do not adhere to the Michaelis and Menten equation; at low substrate concentration, observed rates are higher than predicted ones. The discrepancy between observed and predicted values increases as the population becomes more diverse. If kinetic analysis based on the Michaelis and Menten equation is used to determine the rate of turnover of substrates in natural waters, the rate may be underestimated unless measurements are made at very low added substrate concentrations.

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Biomodulation of Nitrogen Cycle in Suspended Sediment

Tang

Maggi

2018

JGR Biogeosciences

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Biogeochemical experiments and modeling were coupled to investigate how nutrient leaching to aquatic ecosystems changes the dynamics of microbial community on suspended sediment and how these changes modulate the nitrogen cycle. Mineral suspensions amended with inorganic nitrogen (NH 4+ and NO 3−) and inoculated with native sedimentary microbial strains were tested in a settling column under continuous water quality measurements. Experiments were used to calibrate and validate a kinetic model that explicitly described the chemical adsorption on minerals, aqueous complexation, gas dissolution, microbial metabolism, necromass dynamics, and microbial competition for limiting substrates. Modeling revealed that the interactions between microbial functional groups were highly nonlinear and highly sensitive to changes in nutrient and dissolved oxygen concentrations, showing shifts in regimes where a functional group became prevalent over the others. Our results suggested that necromass dynamics played a major role in sustaining microbial growth in low nutrient conditions and had an important control over the N cycle. The reaction network and model structure presented in this study provide a tool to analyze and predict the long‐term nutrient dynamics of both natural and engineered aquatic ecosystems.

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The kinetics of nitrate and ammonia uptake by natural populations of marine phytoplankton

Cited by 158 publications

References 11 publications

Inorganic nitrogen uptake by epilithic periphyton in a N‐deficient lake1

Inorganic nitrogen uptake by epilithic periphyton in a N‐deficient lake1

The validity of the application of simple kinetic analysis to heterogeneous microbial populations1

Biomodulation of Nitrogen Cycle in Suspended Sediment

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