Effects of captivity on house mice behaviour in a novel environment: Implications for conservation practices

•We investigated the effects of captivity on behaviour.•Captive-reared mice differed in boldness and activity compared to wild-caught mice.•There was limited evidence for transgenerational effects on behaviour in captivity.•Behavioural responses in captivity did not differ depending on sex. Captive breeding programmes offer a method for preventing the extinction of threatened species, but often have difficulty establishing self-sustaining populations and generating individuals for release. This difficulty can arise because the behaviour of captive-reared animals differs from wild animals. Whilst the effect of captivity on animal behaviour has been widely reported, few studies have explicitly compared differences between captive-reared and wild-caught animals. Even fewer have examined behavioural types (a composition of behavioural traits) displayed in novel environments, which is particularly relevant for determining reintroduction success. Further, the transgenerational effects on behavioural type, and potential differences between sexes in response to captivity, remain almost completely unknown. Using house mouse (Mus musculus) as a model for small mammals, we tested whether behavioural types displayed in a novel environment differed between captive-reared and wild-caught animals. In addition, it was tested whether behavioural types were subject to transgenerational effects in captivity, and whether there were sex-specific differences in behavioural types. We used an open field test to simulate a novel environment. Captive-reared mice were found to differ in their boldness and activity behavioural type compared to their wild-caught mice (p