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The procedure has been applied to primary production data from Lake Balaton, a shallow lake in Hungary. The growth rate--temperature relation is analyzed by separating the parameter set into two groups characteristic for &quot;warm&quot; and &quot;cold&quot; water phytoplankton, respectively. A bell-shaped curve is found for &quot;cold&quot; water communities, with an optimum at about 7 to 9 degrees Celsius, whereas the &quot;warm&quot; water phytoplankton exhibits a strong exponential dependency in the temperature range of interest (up to 25 degrees Celsius). Is appears also to be related to essentially constant. However, a roughly linear relation with considerably less scatter is obtained when Is is plotted directly versus day-averaged solar radiation. This apparent fast adaptation is attributed to the extremely short overtime in Lake Balaton. Maximum growth rates of 10-20 day^-1 have been found for temperatures between 20 and 25 degrees Celsius. These results and a critical appraisal of available literature suggest that the common notion of maximum growth rates being in the order of 1-3 day^-1 needs revision, at least for lakes with relatively high summer temperatures.</abstract>
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