Individual study: Preference of three anuran species for two simple concrete amphibian tunnel designs, Angers, Pays de la Loire, France
Lesbarrères D., Lodé T. & Merilä J. (2004) What type of tunnel could reduce road kills? Oryx, 38, 220-223
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
A replicated study in 2001, of two experimental tunnels in Pays de la Loire, France (Lesbarrères, Lodé & Merilä 2004) found that amphibians used tunnels and preferred the soil-lined to the bare tunnel. Tunnels were preferred to bypassing on the grass by common toads Bufo bufo (70%) and edible frogs Rana esculenta (68%). However, agile frogs Rana dalmatina tended to bypass (70%). The soil-lined tunnel was used by 68% of the animals that used the tunnels. The difference between soil-lined and bare tunnels was significant for both frog species but not common toads. Crossing success was higher for all species in the soil-lined tunnel. Two concrete pipes (2 m long, 0.5 m diameter) were placed side by side within an enclosure (5 x 3 m). One was lined with sand and humus, the other left bare. Two 0.5 m lengths of drift-fence were installed at 45° to the entrances. A single animal was placed 1.2 m in front of the tunnels with male calls playing from the far end. Each trial lasted 10 minutes and was repeated four days later. Forty-one common toads, 42 edible frogs and 32 agile frogs captured locally were used.