The present study compares several natural habitats and agricultural fields with the aim of assessing the effect that human modifications of habitat have on the species composition and relative abundance of small mammals.
The field research has been carried out in the summer of 2004, in natural and antropic habitats located in the north-eastern part of the country.
The natural habitats were situated in the Ceahlau massif, at different altitudes. They are represented by: a mixed forest (beech and spruce) situated at 900m altitude, near Durau resort; a compact spruce forest, situated at 1500 m altitude, in the south-eastern side of the massif; a clearing also located on the south-eastern side, at 1500m altitude, and the sub-alpine meadow, on the high plateau, at 1800m altitude.
The antropic habitats were located in the vicinity of two villages in Botosani County, at 400m altitude: a wheat field near Leorda village; a vetch field, a corn field and an orchard in the vicinity of Roma village. | 
