Multiple Capture Trap Associations of Meadow Voles (Microtus pennsylvanicus)

Abstract

The structure of a population of meadow voles (Microtus pennsylvanicus) in Massachusetts was studied by examining the composition and distribution of groups of voles in multiple capture live traps. Most voles were captured in pairs, but non-reproductives were more likely to occur in groups of three or more individuals than were reproductives. During months of declining population density, single captures were more common than pair captures, but the composition of pair groups did not differ substantially between months of increasing and declining population density. Of all groups, reproductive females were most likely to occur in single captures; non-reproductive males were least likely to occur singly. Breeding condition appeared to be more important than sex in determining the composition of multiple capture groups. Some support is given for models of female territoriality proposed for this species.