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Effects of Roads on Animal Abundance: An Empirical Review and Synthesis

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dc.contributor.author Fahrig, Lenore en_US
dc.contributor.author Rytwinski, Trina en_US
dc.date.accessioned 2009-07-31T14:50:26Z
dc.date.available 2009-07-31T14:50:26Z
dc.date.issued 2009 en_US
dc.date.submitted 2009-05-27 en_US
dc.date.submitted 2009-05-27 en_US
dc.identifier.uri https://hdl.handle.net/10535/2475
dc.description.abstract "We attempted a complete review of the empirical literature on effects of roads and traffic on animal abundance and distribution. We found 79 studies, with results for 131 species and 30 species groups. Overall, the number of documented negative effects of roads on animal abundance outnumbered the number of positive effects by a factor of 5; 114 responses were negative, 22 were positive, and 56 showed no effect. Amphibians and reptiles tended to show negative effects. Birds showed mainly negative or no effects, with a few positive effects for some small birds and for vultures. Small mammals generally showed either positive effects or no effect, mid-sized mammals showed either negative effects or no effect, and large mammals showed predominantly negative effects. We synthesized this information, along with information on species attributes, to develop a set of predictions of the conditions that lead to negative or positive effects or no effect of roads on animal abundance. Four species types are predicted to respond negatively to roads: (i) species that are attracted to roads and are unable to avoid individual cars; (ii) species with large movement ranges, low reproductive rates, and low natural densities; and (iii and iv) small animals whose populations are not limited by road-affected predators and either (a) avoid habitat near roads due to traffic disturbance or (b) show no avoidance of roads or traffic disturbance and are unable to avoid oncoming cars. Two species types are predicted to respond positively to roads: (i) species that are attracted to roads for an important resource (e.g., food) and are able to avoid oncoming cars, and (ii) species that do not avoid traffic disturbance but do avoid roads, and whose main predators show negative population-level responses to roads. Other conditions lead to weak or non-existent effects of roads and traffic on animal abundance. We identify areas where further research is needed, but we also argue that the evidence for population-level effects of roads and traffic is already strong enough to merit routine consideration of mitigation of these effects in all road construction and maintenance projects." en_US
dc.subject environmentalism en_US
dc.subject landscape change en_US
dc.subject population en_US
dc.subject roads en_US
dc.subject transportation en_US
dc.subject urbanization en_US
dc.title Effects of Roads on Animal Abundance: An Empirical Review and Synthesis en_US
dc.type Journal Article en_US
dc.type.published published en_US
dc.subject.sector Urban Commons en_US
dc.subject.sector Wildlife en_US
dc.identifier.citationjournal Ecology and Society en_US
dc.identifier.citationvolume 14 en_US
dc.identifier.citationnumber 1 en_US
dc.identifier.citationmonth January en_US

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