Summary
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1.
Spectrophotometric and paper chromatographic analyses have been made of pigments in the summer phytoplankton of eight lakes that widely differ in trophic characteristics.
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2.
A comparison has been made between Margalef's pigment ratio, the carotenoid/chlorophyll-a ratio, the pigment diversity expressed as the number of coloured spots on a paper chromatogram, and the pigment diversity calculated by using the Shannon formula.
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3.
No evidence has been found for an increase of diversity of phytoplankton pigments along a gradient from eutrophic towards oligotrophic lakes.
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4.
Pigment diversity cannot be simply used as a measure of lake maturity according to Margalef's ideas.
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Hallegraeff, G.M. Pigment diversity in fresh-water phytoplankton. III. Summer phytoplankton of eight lakes with widely different trophic characteristics. Hydrobiological Bulletin 10, 87–95 (1976). https://doi.org/10.1007/BF02282215
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DOI: https://doi.org/10.1007/BF02282215