Comparing the effectiveness of two roadkill survey methods on roads

Wildlife-vehicle collisions on linear transport infrastructure and especially on roads are poten-tially dangerous for drivers and cause serious economic damage. Moreover, roads cause frag-mentation, creating barriers or traps that are harmful to many animal species, underlining theneed to detect roadkill hotspots. However, the effectiveness of some roadkill survey methods onroads is not fully understood. The aim of this study is to conduct comparative analyses of thespatial distribution, body size totals and composition of roadkill hotspots, using data collected ina study area using two robust roadkill survey methods: i) one conducted monthly by an ecologist,ii) one conducted daily by patrollers. The results suggest that these methods are efficient inlocating mortality hotspots and are complementary: they identify different body size groups, withpatrollers detecting all large fauna and ecologists recording more small species. We suggestcombining both methods to obtain more representative data of road mortality.