Providing evidence to improve practice

Individual study: The acceptance of 0.2-metre tunnels by amphibians during their migration to the breeding site

Published source details

Brehm K. (1989) The acceptance of 0.2-metre tunnels by amphibians during their migration to the breeding site. Amphibians and Roads: Proceedings of the Toad Tunnel Conference, Rendsburg, Federal Republic of Germany, 29-42.


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Install culverts or tunnels as road crossings Amphibian Conservation

A study in 1982–1989 of a tunnel under a road through woodland in Schleswig Holstein province, Germany (Brehm 1989) found that 21% of amphibians recorded along the drift-fencing used the tunnel. In 1988, a total of 2,446 amphibians were recorded along the fence, of which 21% passed through the tunnel. Seven species were recorded using the tunnel. For the four species for which more than 10 individuals were recorded (136–1278/species) 12–45% passed through the tunnel. The tunnel was installed in 1987 (0.2 m diameter, 10 m long). Drift-fencing 360 m long and 0.4 m high already existed at the site. Amphibians were monitored using 28 pitfall traps along the fence and one at the tunnel exit.