Summary
The social behavior of house mice captured from natural populations was studied in an enclosure. Six replicate experiments with observations totalling 344 h were done to contrast the behavior of outbreeders, individuals that have progeny by interdemic reproduction; inbreeders, individuals that have progeny by intrademic reproduction; and nonbreeders. The frequency of outbreeding was also determined.
In each replicate, two male and three female commensal house mice, Mus musculus, homozygous for the same allele at the hemoglobin locus, Hbbs, were put in half of a population cage. A barrier separated this deme from another deme homozygous for the alternative allele, Hbbd. The barrier was removed after a month and each experiment continued for a further two months with daily observations.
In five of six experiments, the mice from both demes formed one social group and in the sixth experiment, the mice remained in their original demes. In two experiments, outbreeding occurred: females from one deme produced offspring by males from the other deme. In three experiments, inbreeding occurred: females produced offspring by males from the same deme. Soon after the demes had formed one social group in these three experiments, the remaining male in a deme was killed and the experiment terminated; females without a male readily join other demes. The pattern of breeding resulted in a genetically effective size, N e , that was approximately half of the maximum N e obtainable with random mating. The social organization of house mice, although structured and characterized by male territoriality, presents no major barrier to gene flow within populations.
Affiliative (mount, allogroom, follow) and agonistic (fight, chase, attack) behavior occurring when the barrier was present had no predictive value in determining which mice would be outbreeders. With the barrier absent, outbreeders were the recipients of more affiliative behavior than inbreeders. Male outbreeders initiated more agonistic behavior than inbreeders. Outbreeders engaged in more interdemic affiliative behavior than inbreeders.
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Contribution no. 362 from the Department of Ecology and Evolution at SUNY, Stony Brook
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Baker, A.E.M. Gene flow in house mice: Behavior in a population cage. Behav Ecol Sociobiol 8, 83–90 (1981). https://doi.org/10.1007/BF00300819
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DOI: https://doi.org/10.1007/BF00300819