Nematode Extraction Baermann Funnel Method Principle

The principle is very simple: nematodes move out of the substrate toward the water, and sink to the bottom of the funnel stem due to gravity forces. The method is suitable for extraction of mobile nematode from substrates like soils and sediments, plant material,a and litter.a Advantages and disadvantages of the method: it is cheap and simple; extraction efficiency is quite good if your sample is small relative to the funnel diameter (with only a thin layer of substrate on the sieve), but decreases very rapidly when your sample gets bigger than that. For alternatives, see Southey (1986).

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