Studies On the Nematode Fauna of an Acid Forest Soil: Spatial Distribution and Extraction

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The distribution of free living soil nematodes was examined by collecting samples consisting of 16 cores in a small plot. The k of the negative binomial was used to describe patterns in the spatial distribution of total numbers and of several species. Both the horizontal and the vertical distributions were aggregated. The efficiency of the Baermann extraction method was compared with direct microscopic examination. Also, the effect of the extraction time on the recovery was tested. For quantitative extraction the Baermann funnel method was a useful technique, but it was less reliable in providing results of community compositions when compared with direct microscopic examination of field material.