Distribution of Protozoa in Soil Profiles

Although protozoa are considered to be distributed principally in the upper few centimeters of a soil profile, they are also found at depths of more than 200 meters (m) in groundwater environments (Sinclair and Ghiorse, 1989). Small (2-3 Mm cell size) microflagellates were found to decrease 10-fold in numbers during movement through 1m in a sandy matrix under a trickling-filter facility (in dilute sewage), as compared to a 10-fold reduction in bacterial transport over a 10-m distance (Harvey et al., 1995).

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