Ecology and social behavior of the midday gerbil Meriones meridianus: Insights from long-term research in the wild and seminatural environments

The present review provides a compilation of the published data on the ecology and social behavior of midday gerbils. Both field studies and observations under semi-natural conditions provide evidence that the midday gerbil is a nocturnal, primarily granivorous rodent that lives in highly seasonal habitats. A typical feature of the midday gerbils’ spatial organization is formation of multi-male–multi-female associations (breeding colonies) in which male home ranges overlap each other and with female ranges to a great extent, while females tend to occupy exclusive home ranges. The mating system of this species can be defined as polygynandry or promiscuity; males appear to compete for access to receptive females. The social structure in the midday gerbil is primarily based on aggressive interactions between conspecifics resulting in a dominance hierarchy among males and site-dependent dominance among females, especially during the breeding season. After the cessation of reproduction, a tendency towards more pronounced gregariousness appears, and midday gerbils form wintering groups; gerbils, however, lead solitary lives within these groups. Overall, the data presented expand our understanding of socio-ecology of gerbils.