1992/04/01 by Graham W. Smith, Ronald E. Reynolds
Mathematics · Environmental Science · #Survey Sampling and Estimation Techniques #Animal Ecology and Behavior Studies #Avian ecology and behavior
paper · doi:10.2307/3808827
A recent pattern of changes in hunting regulations offered a unique opportunity to further investigate the relationship between hunting and survival rates of mallards (Anas platyrhynchos). Consequently, we used 2 approaches to study the effects of hunting on survival of mallards banded on the Canadian prairie and the northcentral United States. First we compared recovery and survival rates during 1979-84, when regulations were stable and relatively liberal, with rates during 1985-88, when regulations were restrictive. Recovery rates declined between the 2 periods, suggesting that harvest rates declined. Survival rates for all age-sex classes were greater during the second period. Second, we analyzed the additive and compensatory nature of hunting mortality, for the same data, using the ultrastructural model of Anderson et al. (1982), as extended by Barker et al. (1991)