Providing evidence to improve practice

Individual study: Wildlife use of culverts beneath US Highway 441 in Paynes Prairie State Reserve, Florida, USA

Published source details

Dodd C.K., Barichivich W.J. & Smith L.L. (2004) Effectiveness of a barrier wall and culverts in reducing wildlife mortality on a heavily traveled highway in Florida. Biological Conservation, 118, 619-631


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 replicated study in 2001–2002 of eight culverts underneath a highway through a freshwater marsh in Florida, USA (Dodd, Barichivich & Smith 2004) found that 13 frog and two salamander species used culverts and road mortality declined. A total of 656 frogs and six salamanders were captured using culverts. Following construction of a barrier wall linking culverts, frog species using culverts increased from five to 13 and frogs trapped increased from 0.006 to 0.085/trap night. Ranid frog mortality declined dramatically following installation of the barrier wall-culvert system. However, tree frog mortality appeared to increase (from 149 to 194). Two dry box culverts (1.8 x 1.8 x 44 m) and two partially submerged box culverts (2.4 x 2.4 x 44 m) already existed. In 2001, four additional dry/wet cylindrical culverts (0.9 x 44 m) were installed at the same time as a 3 km barrier wall along the highway, parallel to wetland prairie. Culverts were 200–500 m apart along the wall. Monitoring was undertaken on five nights/week from March 2001 to March 2002. Ten wire screen-mesh funnel traps were placed in each box culvert and four crayfish traps in each cylindrical culvert.