Social and spatial organization of free-ranging shrews, Sorex coronatus and Neomys fodiens (Insectivora, Mammalia)

摘要: Abstract Abstract. The social organization of free-ranging Sorex coronatus and Neomys fodiens was studied by measuring the spatial distribution temporal avoidance or aggregation individuals, using simultaneous radio-isotope tracking several shrews. strictly territorial during non-breeding season, with little overlap between home ranges low coincident activity individuals. In breeding females remained territorial, whereas large range males also observed. During this kept intensive watch on one female occasionally visited a second, which in turn regularly another male. This behaviour suggests monogamous mating system tendency towards polygamy. season. Each individual defended portion river but slightly greater observed rather than within sexes. tended to wander, indicating an 'overlap promiscuous' system. After weaning, juveniles both species dispersed rapidly became until following These results were compared published data Crocidura russula . there are two types organization: colonial C. russula, where rest individuals allows them reduce their daily expenditure energy thermoregulation; S. N. fodiens, may ensure adequate food supply. season for all three perhaps they have sufficient litters. For males, different strategies been these discussed.