3/4/2023 0 Comments Underpass wildlife crossing![]() Biological Conservation, 142, 270-279.Ī replicated, site comparison study in 2008 at 13 under-motorway crossing routes in agricultural and woodland habitat in southern Ireland (Abbott et al 2012) recorded more bat activity in under-motorway routes (underpasses or rivers bridged over by the road) than over the road above them, or in adjacent habitats. (2009) Species-specific barrier effects of a motorway on the habitat use of two threatened forest-living bat species. Each of 40 adult female bats was radio-tracked for at least three full consecutive nights. Mist netting was carried out for 153 nights at 12 sites within the forest in May–September 2004–2007. ![]() The underpass (5 m wide x 4.5 m high x 30 m long) was located within a motorway section surrounded by forest. The motorway had four to five lanes carrying an average of 84,000 vehicles/day. Five of six radio-tracked barbastelle bats Barbastella barbastellus crossed the motorway but flew over the road (21 crossings at six different sites) more often than through the underpass (16 crossings). Only three of 34 radio-tracked Bechstein’s bats Myotis bechsteinii crossed the motorway, all using the underpass (36 crossings). Supporting evidence from individual studiesĪ study in 2004–2007 of an underpass below a motorway in a forested area of northern Bavaria, Germany (Kerth & Melber 2009) found that a cluttered habitat bat species rarely crossed the motorway and only crossed through the underpass, whereas an open habitat bat species crossed the motorway frequently and flew over the road more often than through the underpass. (2011) Factors determining the use of culverts underneath highways and railway tracks by bats in lowland areas. Barbastella, Journal of Bat Research & Conservation, 7, 22–31.īoonman M. Pasos agrícolas inferiores de carreteras: su importancia para los murciélagos como refugio y lugar para cruzar la vía. (2014) Agricultural underpasses: their importance for bats as roosts and role in facilitating movement across roads. (2004) Tunnels as a possibility to connect bat habitats. We did not find any studies that assessed underpasses below railways as crossing structures for bats.īach L., Burkhardt P. The studies described below report the proportion of bats that are either using underpasses to cross roads safely, or are crossing the road above them at risk of collisions with traffic. However, these studies have not been summarised here as they do not provide data that can be used to assess effectiveness, such as a control or the proportion of bats that are or are not using the underpasses. There is evidence that an unknown proportion of bats of various species use underpasses below roads (e.g. They have the potential to reduce the number of bats killed by traffic and increase the permeability of roads/railways for bats to maintain connectivity across the landscape. Underpasses may guide bats safely under roads or railways.
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