Record Display for the EPA National Library Catalog

RECORD NUMBER: 283 OF 1579

OLS Field Name OLS Field Data
Main Title Effect of Environmental Factors on Phytoplankton Growth: Light and the Interactions of Light with Nitrate Limitation (Journal Version).
Author Rhee, G-Yull ; Gotham, Ivan J. ;
CORP Author New York State Dept. of Health, Albany. Div. of Labs. and Research.;Environmental Research Lab.-Duluth, MN.
Year Published 1981
Report Number EPA-R-804689; EPA-600/J-81-632;
Stock Number PB83-243782
Additional Subjects Phytoplankton ; Growth ; Ecology ; Lakes ; Irradiance ; Underwater light ; Turbidity ; Inorganic nitrates ; Chlorophylls ; Cells(Biology) ; Density(Mass/volume) ; Biomass ; Nitrogen ; Phosphorus ; Carbon ; Correlation ; Reprints ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB83-243782 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 14p
Abstract
The effects of simultaneous limitations of light and nutrient on growth were investigated with turbidostat and chemostat cultures of Scenedesmus sp. and Fragilaria crotonensis. The combined effects were greater than the sum of individual effects and were not multiplicative. Under nitrate-limited conditions the cell quota of the limiting nutrient for a constant growth rate and the subsistance quota increased as irradiance decreased. Within a certain limit of growth rates, light and q sub N can compensate for each other in maintaining growth rate. Under nutrient-sufficient conditions, cell quotas of C, N, and P, and cellular chlorophyll a concentration increased as light decreased below saturation. The cell quotas are the maximum level that can be achieved at a given irradiance.