Abstract
Abstract Possible limitation of growth and distribution of freshwater organisms by the availability of potassium, an essential major bio-constituent and plantnutrient, is considered for inland waters. It is interpreted in relation to the range of concentrations normally encountered and experimental work on specific growth rates of algae at low concentrations, minimum cell and biomass quotas of K, biomass yields under graded additions, inhibition at higher concentrations, and response to cation-ratios in the medium. The range of K+ concentrations in inland waters is surveyed. Most concentrations exceed 10 µmol L-1, and are greatly in excess of those (under 1 µmol L-1) found limiting specific growth rates of test species. They are also in excess of the content in most natural populations of phytoplankton when yields have the experimental minimum or limiting cell/biomass quota, of the order of 1% dry weight. Limiting concentrations for specific growth rate in nature are therefore probably rare. They, and yie...
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