Fig. 4From: Stress hormone level and the welfare of captive European bison (Bison bonasus): the effects of visitor pressure and the social structure of herdsEffect of visitor pressure (Low = weekdays; Elevated = weekends) on immunoreactive fecal cortisol level (mean and 95% CI, Box–Cox transformed) in European bison with regard to site: low pressure—low numbers of visitors on weekdays; elevated pressure—5–7 times more visitors at weekends. Statistically significant differences in a pairwise comparison with the Least Difference Test are indicated on the graphBack to article page