The effect of rearing methods on survival of reintroduced black-footed ferrets

摘要: We estimated minimum survival rates for 282 young-of-year, captive-reared, black-footed ferrets (Mustela nigripes) reintroduced into prairie dog (Cynomys spp.) colonies in Wyoming, Montana, and South Dakota. used night surveys with spotlights to locate about 1 month 9 months postrelease. modeled using gender, year, site, 4 rearing methods. Minimum were highest (30% month, 20% months) reared from early ages outdoor pens simulated habitat; was lowest cage-reared released without pen experience (11% 2% months). Rearing method year influenced 1-month a comparison of 3 levels (pen as defined above, transfer kits zoos facilities at age 60-90 days, >90 days) during releases 1994-95 Montana. Higher associated intensive management coyotes (Canis latrans) 1995. Survival not different (P > 0.05) between sites or sexes, regardless model. recommend routine use prerelease conditioning ferret kits.