Gromov V.S. 2026. The Mongolian gerbil phenomenon: Can the generally accepted conceptual models explain the evolution of sociality, helping and cooperation in this species? // Russian J. Theriol. Vol.25. No.1. P.44–54 [in English].
Vladimir S. Gromov [vsgromov@mail.ru], A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia.
doi: 10.15298/rusjtheriol.25.1.06
ABSTRACT. The present article provides a compilation of the published data on the life history traits of the Mongolian gerbil (Meriones unguiculatus) related to sociality, helping and other cooperative behaviors. The evolution of sociality in rodents means the transition from solitary living to a family-group lifestyle. The Mongolian gerbil is a highly social and cooperative breeding species with the complicated social organization and biparental care. The most common social units of this species are extended family groups. Members of the family groups act cooperatively defending and marking their territories, maintaining nests, hoarding food, and raising young. Thus, the Mongolian gerbil is a species with high cooperative abilities. The generally accepted conceptual models relevant to the evolution of sociality among rodents do not explain the evolution of sociality in the Mongolian gerbil. Predation pressure and spatial distribution of food resources cannot be considered selective forces promoting the formation of family groups. Alloparental care, or helping, is not reproductive altruism in the Mongolian gerbil, and it seems unlikely that this behavior evolved merely due to kin selection under ‘Hamilton’s rule’. Cooperation is an immanent attribute of a family-group lifestyle. Complex forms of cooperation, in turn, contribute to the evolution of sociality. This evolutionary process can be thought of as some kind of ‘stimulation of similar with the similar’: pair bonding stimulates cooperation which in turn contributes to the formation of extended family groups typical of this species.
KEY WORDS: Mongolian gerbil, sociality, evolution, helping behavior, cooperation.