Individual study: Autumn reintroduction of 77 radio-tagged ruffed grouse Bonasa umbellus into north Missouri had 76% mortality by the following spring
Kurzejeski E.W. & Root B.G. (1988) Survival of Reintroduced Ruffed Grouse in North Missouri. The Journal of Wildlife Management, 52, 248-252
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
A replicated study of 42 adult and 35 immature ruffed grouse Bonasa umbellus translocated from Illinois, USA, to Creek State Forest, Missouri, in autumn 1986 (Kurzejeski & Root 1988) found that 25% of translocated birds survived until May 1987. A maximum of eight of 37 females survived until the breeding season. Mortality rates were highest in the post-release period, with 15 grouse dying within seven days of release. Eighty-six percent of mortalities were attributed to avian or mammalian predation. Birds injured in transit did not have a lower survival rate than those without visible injury at the time of release.