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Research article - Peer-reviewed, 2020

Ungulate use of non-wildlife underpasses

Bhardwaj, Manisha; Olsson, Mattias; Seiler, Andreas

Abstract

Wildlife crossing structures can provide safe passage for wildlife across transportation corridors, and can help mitigate the effects of highways and exclusion fencing on wildlife. Due to their costs, wildlife crossing structures are usually installed sparsely and at strategic locations along transportation networks. Alternatively, non-wildlife underpasses (i.e. conventional underpasses for human and domestic animal use) are usually abundant along major infrastructure corridors and could potentially provide safe crossing opportunities for wildlife. To investigate this, we monitored the use of 40 non-wildlife underpasses by roe deer (Capreolus capreolus), and moose (Alces alces) in south-central Sweden. We found that roe deer and moose use non-wildlife underpasses, and prefer underpasses that are at least 11.5 m wide and 5 m tall. Furthermore, roe deer used structures that had little human co-use and were in locations where the forest cover differed on both sides of the highway. In most cases, roe deer and moose were detected within 50 m of the underpass more than they were detected crossing under them. This suggests that animals often approach underpasses without crossing under them, however modifications to underpass design may improve non-wildlife underpass use. We recommend non-wildlife underpasses at gravel and minor roads, particularly those with little human co-use and with variable forest cover on both sides of the highway, be built wider than 11.5 m and taller than 5 m.

Keywords

Wildlife crossing structures; Landscape connectivity; Road ecology; Human-wildlife interaction; Barrier effect; Conventional underpasses

Published in

Journal of Environmental Management
2020, volume: 273, article number: 111095
Publisher: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

Authors' information

Swedish University of Agricultural Sciences, Department of Ecology
Olsson, Mattias
EnviroPlanning AB
Swedish University of Agricultural Sciences, Department of Ecology

UKÄ Subject classification

Fish and Wildlife Management
Ecology

Publication Identifiers

DOI: https://doi.org/10.1016/j.jenvman.2020.111095

URI (permanent link to this page)

https://res.slu.se/id/publ/108124