Using drones as a monitoring tool to detect evidence of winter sports activities in a protected mountain area

Abstract

The capercaillie (Tetrao urogallus) is a mountain grouse species listed in the Red Lists of Switzerland and other countries of Europe. As a consequence of its conservation status, human activities are restricted in most of its remaining habitats. One sub-population of the capercaillie is located in the Entlebuch UNESCO Biosphere Reserve. The margins of one of its territories are increasingly used by snowshoe hikers and ski tourers at the capercaillie’s most vulnerable time, during winter. In order to identify and monitor possible interferences, we tested whether drones can help to detect snowshoe and ski tourer tracks in the winter landscape and whether there is any reaction of wildlife to the drones. Results indicate that certain environmental conditions are needed to carry out accurate drone flights, but that with optimal technical and aeronautical settings, it is possible to gain aerial images that allow winter activities by humans to be identified, and even quantified. No disturbances to wildlife were identified. The findings indicate that drones can be used as a low-cost monitoring tool for detecting human winter activities in remote places, which represent a fast-growing threat to wildlife in mountain areas.