Abstract
Practical difficulties in the application of correct statistical methods in field ecology are illustrated by a plankton abundancy estimation in a small pond. Random sampling was performed over a limited number of previously chosen sample places and times. A cylindric sampler was used, which caught the plankton within a whole water column (1 m). Relatively high numbers of samples were needed to achieve reliable estimates of population parameters, which was demonstrated by simultaneous sampling. The probability distribution of the number of daphnids per sample was shown to be approximately lognormal. However, the variances of the log-transformed data were not uniformly homogeneous, which reduces the applicability of familiar tests for parameter comparison. Arguments are presented to make comparisons of population abundancies through transformed data only.
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