Abstract
Proper control sites for nematode abundance, patch size and patch dispersion could not be defined prior to a manipulative oil pollution experiment despite the apparent physical similarity and proximity of two locations. Comparisons of abundance and patch size demonstrated that neither site could serve as a control for the other. Spectral analysis was not useful, in this case, in resolving patch dispersion in the range of 1·2 to 60 cm. These data indicated that in circumstances where a posteriori studies comparing two areas cannot be avoided, it is only with great caution that a single factor should be interpreted as causative of observed densities or distribution of organisms.
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