Testing the efficacy of deterring systems in two gull species

During recent decades, populations of some gull species have dramatically increased causing management problems; as a result of this, a number of deterring systems have been implemented. In this study, three commonly used scaring methods (visual, acoustic, falconry) were tested at a refuse dump. In order to evaluate the efficacy of the methods and, in particular, habituation occurrence, an index was developed that can be used for comparing such...