N.M. V AN STRAALEN** and D.A. KRIVOLUTSKY* **Department of Ecology and Ecotoxicology VrUe Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands *I

1. Defining and assessing soil health and sustainable productivity 2. The relationship of soil health to ecosystem health 3. Rationale for developing bioindicat

Protozoa are active components of the soil microfauna. For example, they may stimulate bacterial metabolism and some fungal metabolites can lyse protozoa. They

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