title: Social systems: demographic and genetic issues.
authors.affiliation: Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland. Nicolas.Perrin@unil.ch
authors.forename: Nicolas
authors.initials: N
authors.lastname: Perrin
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Petit
authors.forename: Nelly
authors.initials: N
authors.lastname: Menard
mesh_terms: D025041:Animal Migration; D000818:Animals; D003163:Competitive Behavior; D003299:Cooperative Behavior; D014644:Genetic Variation; D007178:Inbreeding; D012726:Sexual Behavior, Animal