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Processes in nutrient based phytoplankton ecology Turpin, David Howard
Abstract
Fluctuations in the free intracellular amino acid pools following an ammonia perturbation to ammonium limited Skeletonema costatum and Gymnodinium simplex provides evidence which suggests that the enzyme glutamine synthetase (EC.6.3.1.2) acts as the primary ammonium assimilating enzyme in marine phyto-plankton under nitrogen limitation. Limiting nutrient patchiness (ammonium) is examined as a factor affecting both phytoplankton physiology and competition. It is shown that temporal patchiness in the supply of the limiting nutrient sets up periodicities in cellular carbon fixation and in vivo chlorophyll a fluorescence. Populations grown in a patchy limiting nutrient environment appear better adapted to take up nutrient pulses than do populations grown under conditions of homogeneous distributions of the limiting nutrients. It is also shown that the patchiness of the limiting nutrient effects the outcome of species competition with the winners being those species best able to optimize uptake under that particular patchy regime. A theoretical framework is developed to explore the effects of limiting nutrient patchiness on phytoplankton growth. This work shows that the degree of patchiness in the environment can affect individual growth rates and thus alter community structure even though there is no change in the average ambient nutrient concentration. In addition the apparent K[sub s] for growth, for patch adapted populations, may be lowered significantly by making the distribution of the nutrient patchy with respect to time. A qualitative model is proposed relating nutrient supply, light and temperature and their effects on phytoplankton community structure.
Item Metadata
| Title |
Processes in nutrient based phytoplankton ecology
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| Creator | |
| Publisher |
University of British Columbia
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| Date Issued |
1980
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| Description |
Fluctuations in the free intracellular amino acid pools following an ammonia perturbation to ammonium limited Skeletonema costatum and Gymnodinium simplex provides evidence which suggests that the enzyme glutamine synthetase (EC.6.3.1.2) acts as the primary ammonium assimilating enzyme in marine phyto-plankton under nitrogen limitation.
Limiting nutrient patchiness (ammonium) is examined as a factor affecting both phytoplankton physiology and competition. It is shown that temporal patchiness in the supply of the limiting nutrient sets up periodicities
in cellular carbon fixation and in vivo chlorophyll a fluorescence. Populations grown in a patchy limiting nutrient environment appear better adapted to take up nutrient pulses than do populations grown under conditions of homogeneous distributions of the limiting nutrients. It is also shown that the patchiness of the limiting nutrient effects the outcome of species competition with the winners being those species best able to optimize uptake under that particular patchy regime.
A theoretical framework is developed to explore the effects of limiting
nutrient patchiness on phytoplankton growth. This work shows that the degree
of patchiness in the environment can affect individual growth rates and thus
alter community structure even though there is no change in the average ambient nutrient concentration. In addition the apparent K[sub s] for growth, for patch adapted populations, may be lowered significantly by making the distribution of the nutrient patchy with respect to time.
A qualitative model is proposed relating nutrient supply, light and temperature and their effects on phytoplankton community structure.
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| Genre | |
| Type | |
| Language |
eng
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| Date Available |
2010-03-23
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| Provider |
Vancouver : University of British Columbia Library
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| Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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| DOI |
10.14288/1.0095219
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
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| Campus | |
| Scholarly Level |
Graduate
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| Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.