Microhabitat partitioning in a rodent community in the arid conditions of the South-western Caspian Lowland

Abstract. This article analyses the factors underlying the spatial distribution of a rodent community in the arid conditions of the Caspian Lowland. Based on a habitat selection model, we hypothesized that sympatric species would occupy and utilize species-specific environmental habitats and resources in common spaces and that niche overlap between species would be low. Thirteen environmental parameters were chosen for study. Nine parameters significantly discriminated interspecies differences (Meriones meridianus occurred in dry microhabitats, Meriones tamariscinus occurred in wetter microhabitats, and Apodemus witherbyi and Cricetulus migratorius showed eurybiotic spatial patterns). Mus musculus was predominantly found in wet environmental conditions. Thus, A. witherbyi and C. migratorius were characterized by the greatest range of spatial niches in the community, and M. musculus was characterized by the narrowest range of spatial niches. Pairwise comparisons of rodent spatial niches revealed low overlap values.