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Halle S. & Lehmann U., 1987: Population dynamics and individual features during the phase of decline in the field vole Acta theriol., 32, 2: 21—29 (With 3 Figs.) A North Swedish population of the field vole Microtus agrestis (Linnaeus, 1761) in the phase of decline was studied in detail by the use of individual marking and brief trapping intervals over one re- productive season. In early spring, a distinct surplus of males was found. Reproduction started with a delay of about 4 weeks, thus the first juveniles could not be trapped earlier than the beginning of June. All the overwintered adults disappeared during 10 days just prior to the recruitment of the young, resulting in a total exchange of the pop- ulation. The members of the spring born cohort ceased growing at an age of about 25 days and maintained body weights of 20—30 g during the entire time of observation. Although sexual activity was obvious in both sexes, no juveniles could be trapped during summer. Both immigration and emigration was scarcely seen. Thus during summer, the population remained rather uniform with respect to number, age and weight, closely resembling a pattern found during winter. The reasons and implications of these findings are discussed. (Zool. Inst., Phys. Okol., Univ. Koln, Weyertal 119, 5000 Koln 41, FRG).