NIGHT ROOST SELECTION DURING WINTER BY RUFFED GROUSE IN THE CENTRAL APPALACHIANS

Abstract

In northern regions, ruffed grouse (Bonasa umbellus) conserve considerable energy during winter by burrowing under snow cover to roost. When conditions are unsuitable for snow burrowing grouse almost invariably roost in conifers. We studied selection of winter night roosts by ruffed grouse in western Virginia, a region where snow accumulations are rare and transient. Grouse almost always used ground roosts when snow was present even though snow was never deep enough for snow burrowing. When snow was absent grouse did not show any clear preference in roost microsite type, and were found roosting in and under deciduous and evergreen trees and shrubs, in brush piles, and in leaf litter. We hypothesize that this ambivalence to conifers was due in part to persistent accumulations of fallen oak leaves, which likely afford grouse good thermal cover and concealment. Grouse were frequently found at low elevations during daytime, but rarely roosted in bottoms. This suggests daily elevational movements, possibly to avoid cold air settling in low-lying areas during night.