Intraspecific variation in migratory pattern of a partial migrant, the Blue Tit (Parus caeruleus) : An evaluation of different hypotheses
To evaluate hypotheses explaining intraspecific variation in migratory behavior in partial migrants, a local population of Blue Tits (Parus caeruleus) was studied in southern Sweden. Birds born in the study area and recaptured there in winter were compared with birds recaptured at a nearby bird station where a large number of migrant Blue Tits were passing. By comparing sex ratios among migrants a
