Linear developments, such as roads, are recognized as
major contributors to wetland fragmentation. Studies
have shown that the barrier effect of roads result in
inbreeding among wetland species and reduced genetic
diversity. For amphibian species, heightened risk of
local extinction due to population dynamics, and
decreases in the ability of species to re-colonize
otherwise suitable habitat have been cited.
This publication examines strategies adopted to
mitigate fragmentation effects on sensitive wetland
habitats. Corrugated steel culverts are evaluated for
their effectiveness as transit corridors for
amphibians and small mammals at Vancouver Island
locations. Tracks of several species are recorded and
analyzed for occurrences over time.
Recommendations are made for improved monitoring of
amphibians and small mammals near roads, and for
enhancing the performance of culverts as transit
corridors beneath roads. Comparative trials compare
preferences of the Rough-skinned Newt (Taricha
granulosa) for corrugated steel culvert treatments.
Results of the trials show amphibian preferences for
the amount of moisture, the amount of light, and
substrates used within steel culverts.