Using supplemental food and its influence on survival of northern bobwhite (Colinus virginianus)

Abstract

Biologists have debated the effectiveness of supplemental feeders as a management tool for the northern lDobwhite (Colinus virginianus), but few extensive evaluations have been conducted. We examined 783 crops from harvested bobwhites during 1992-1996 to determine effects of climatic stress in winter on use of supplemental feeders and their impact on survival rate in winter. Crops of bobwhites harvested from areas with supplemental feeders contained 28.20/o supplemental food compared with 5.5°fO (P<0.001) for those from areas without supplemental feeders. Winter ciimate was not a significant predictor of the proportional use of supplemental feeders. Rates of winter survival were greater on areas with supplemental feeders compared with non-supplemented areas in winters 1992-1993 (P-0.001 ) and 1993-1994 (P-0.002), but in 1 994-1 995, rates were greater on nonsupplemented areas (P-0.032). Causespecific mortalit:y rates indicated that supplemental feeders did not predispose bobwhites to hunter harvest or predators. Results suggested that bobwhites can gain nutritional benefits from suppiemental feeders during times of severe winter stress.