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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Effectiveness of short sections of wildlife fencing and crossing structures along highways in reducing wildlife-vehicle collisions and providing safe crossing opportunities for large mammals
Auteurs :	Marcel P. Huijser, Auteur ; Elizabeth R. Fairbank, Auteur ; Whisper Camel-Means, Auteur ; Jonathan Graham, Auteur ; Vicki Watson, Auteur ; Pat Basting, Auteur ; Dale Becker, Auteur
Type de document :	Article
Dans :	Biological Conservation (197 MAY 2016)
Article en page(s) :	61-68
Langues:	Anglais
Résumé :	Wildlife fencing in combination with crossing structures is commonly regarded as the most effective and robust strategy to reduce large mammal-vehicle collisions while also maintaining wildlife connectivity across roads. However, fencing and associated measures may affect landscape esthetics and are sometimes considered costly and unpopular. Therefore fence length is often minimized. We investigated 1) whether short fenced road sections were similarly effective in reducing large mammal-vehicle collisions as long fenced road sections (literature review), and 2) whether fence length influenced large mammal use of underpasses (two field studies). We found that: 1) short fences (5 km) (typically >80% reduction): 2) wildlife use of underpasses was highly variable, regardless of fence length (first field study); 3) most highway crossings occurred through isolated underpasses (82%) rather than at grade at fence ends (18%) (second field study); and 4) the proportional use of isolated underpasses (compared to crossings at fence ends) did not increase with longer fence lengths (up to 256 m from underpasses) (second field study). If the primary success parameter is to improve highway safety for humans by reducing collisions with large ungulates, the data suggest fence lengths of at least 5 km. While longer fence lengths do not necessarily guarantee higher wildlife use of underpasses as use varies greatly between locations, wildlife fencing can still improve wildlife use of an individual underpass. (C) 2016 Elsevier B.V. All rights reserved.

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