Abstract
Twenty lakes (oligotrophic or eutrophic) with a wide range of acidity (pH 3.5 to 7.6) show a typical trophic response to total phosphorus with respect to algal biomass (OECD relationship), irrespective of their acidity. Zooplankton abundance is also related to total phosphorus, except for an outlier lake which is very acidic and eutrophic. This lake, however, has an abundant benthic and pelagic insect fauna and shows an overall ‘normal’ trophic response to phosphorus. In three lakes where planktonic primary production at light optimum (Pmaxwas measured, it was highest in the most acid lake (pH 4.4) which has the largest total phosphorus concentration.
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