The behaviour of migrating anurans at a tunnel and fence system

Published source details Buck-Dobrick T. & Dobrick R. (1989) The behaviour of migrating anurans at a tunnel and fence system. Amphibians and Roads: Proceedings of the Toad Tunnel Conference, Rendsburg, Federal Republic of Germany, 137-143.
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This study is summarised as evidence for the following.

	Action	Category
	Install barrier fencing along roads Action Link
	Install culverts or tunnels as road crossings Action Link

Install barrier fencing along roads

A study in 1984–1985 of a barrier fence and wildlife tunnel in Lower Saxony, Germany (Buck-Dobrick & Dobrick 1989) found that many common toads Bufo bufo and common frogs Rana temporaria went around the end of the barrier fence and were killed on the road during breeding migrations. In 1985, deaths were reduced by lengthening the fence. Initially, fences 350 m long were installed on both sides of the road. A concrete tunnel was located in the centre of the fences. Common toads and common frogs were monitored in March–April. Toads were tagged.
Install culverts or tunnels as road crossings

A study in 1984–1985 of a tunnel with barrier fencing in Lower Saxony, Germany (Buck-Dobrick & Dobrick 1989) found that only 15% of amphibians recorded entered the tunnel and few passed through the tunnel. It was considered that this may have been due to high water levels which resulted in a stream flowing through the tunnel. Fences 350 m long were installed on both sides of the road. The concrete tunnel was located in the centre of the fences. Common toads Bufo bufo and common frogs Rana temporaria were monitored in March–April. Toads were tagged.