Subfossil oribatid mites in peat deposits of a wetland in Western Siberia were studied. The mites found in the peat layers showed that the wetness of the area changed over 8,850 years. When the surface was wetter, certain mite species were more common. As the wetness decreased, different mite species became more abundant. This shows how the mites can tell us about the history of the wetland's environment.