Carbon fixation by phytoplankton in high Arctic lakes: implications of low temperature for photosynthesis
Article Abstract:
Carbon fixation by phytoplankton has been studied in seven lakes in the high Arctic in Canada with a view to implications low temperature might have for photosynthesis. One lake was ultraoligotrophic, one was nutrient-enriched and two were meromictic. Derived photosynthetic parameters were low for all samples. Photosynthetic parameters for phytoplankton in Arctic and Antarctic lakes are 3- to 6-fold lower than for ice algae, marine algae and cultures over the identical low-temperature range. Perhaps the more severe nutrient stress in high-latitude lakes vs polar marine environments and vs persistence of nonactive pigments in cold freshwaters are responsible.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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Size-dependent C:N uptake by phytoplankton as a function of irradiance: ecological implications
Article Abstract:
C:N uptake as a function of irradiance varies with the cell size of phytoplankton, according to results of a study in Lake Biwa, Japan. Underwater light thus appears to control size-dependent stoichiometry and the size structure of phytoplankton populations. Where nitrate is significant in the phytoplankton nitrogen economy, maximum biomass production per unit of nitrogen uptake by large cells is favored when irradiance is high, while low irradiance promotes a high biomass increase per unit of nitrogen uptake by small cells.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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Laboratory measurements of angular distributions of light scattered by phytoplankton and silt
Article Abstract:
Light scattering properties have been measured for two kinds of estuarine sediments and 15 types of phytoplankton, including species from coastal and inland waters. The internal cell structure of phytoplankton has a considerable effect on light scattering properties, much more than the external shape. Mie calculations do not adequately approximate measured scattering properties. The San Diego Harbor standard scattering function was similar to just three of the 17 measured scattering functions.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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