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Providing evidence to improve practice

Action: Close roads during seasonal amphibian migration Amphibian Conservation

Key messages

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Supporting evidence from individual studies


A before-and-after study in 1983 of a road in Oberbergischer Kreis, Germany (Karthaus 1985) found that closing the road allowed common toads Bufo bufo to successfully cross. While the road was open none of the young amphibians reached the other side. However, one hour after closure about 100,000 toads were found crossing along a 400 m section of the road. The road was closed for eight days until the migration of amphibians was over in spring.



A replicated study in 1986 of 114 sites including at least 11 road closure sites, 60 amphibian barrier fences and 23 hand-collected human-assisted crossings in Nordrhein-Westphalia, Germany (Feldmann & Geiger 1989) found that 131,061 amphibians were protected from death on roads during breeding migrations. Between one and 116,515 individuals of 14 species were recorded at the road closure sites, assisted crossings and barrier fences at the 114 sites. Nine sites had a combination of two of the interventions and for 20 sites it was unknown which of the interventions were used.


Referenced papers

Please cite as:

Smith, R.K., Meredith, H. & Sutherland, W.J. (2019) Amphibian Conservation. Pages 9-65 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2019. Open Book Publishers, Cambridge, UK.