Berlese or Tullgren Extraction

Large Tullgren funnels will extract microarthropods from samples of forest floor, but sample size is necessarily limited to 0.1-2.5 m2 collections. Larger samples will be necessary for those taxa whose densities are smaller than 1-2 per m2, and careful examination and hand sorting may be the preferable means of processing them. Forest floor materials can be removed from a measured area and then crumbled over a coarse screen atop a white enameled pan. Arthropods are captured as they are released from the sample. An alternate procedure involves crumbling the sample gently into a container of water and collecting arthropods that float to the surface (Bater, 1996).

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