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Abstract

Field work commenced in early June when a trap sample of animals from several sites showed that breeding was well underway. Population densities at the different sites varied widely; trap-night yields ranged from 0 to 33 percent. Behavioral tests of field trapped animals were made in the laboratory. A second sample of animals was collected starting in late September to assess breeding. Although it is not yet complete, it is obvious that densities again vary widely between fields within a seven mile radius. Material for aging is saved from all animals and some voles are being caged for behavioral observations in the laboratory during the winter. Project Number 183.

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