Effect of paved road density on abundance of white-tailed deer
Keith G. Munro A , Jeff Bowman B and Lenore Fahrig A C
+ Author Affiliations
- Author Affiliations
A Geomatics and Landscape Ecology Research Laboratory, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.
B Wildlife Research and Development Section, Ontario Ministry of Natural Resources, DNA Building, 2140 East Bank Drive, Peterborough, ON K9J 7B8, Canada.
C Corresponding author. Email: lenore_fahrig@carleton.ca
Wildlife Research 39(6) 478-487 https://doi.org/10.1071/WR11152
Submitted: 24 August 2011 Accepted: 17 May 2012 Published: 26 June 2012
Abstract
Context: Although ~3% of white-tailed deer are killed on roads each year, no previous study has tested for an effect of roads on deer abundance. This is difficult to do because road density is generally negatively correlated with deer habitat availability.
Aims: Our goal was to determine whether roads affect deer abundance.
Methods: First, we used an existing dataset from Pennsylvania, USA, to determine a range of paved road densities representing a significant range in deer per capita mortality. We then conducted a field study in eastern Ontario, Canada, with sample sites for relative deer abundance selected such that (1) road density in the surrounding landscapes varied over this same range, and (2) there were low correlations across landscapes between road density and deer habitat availability. The latter allowed us to isolate the effects of roads from the effects of habitat on deer abundance. We indexed relative deer abundance using a combination of pellet samples and track counts.
Key results: Unexpectedly, we observed a positive relationship between relative deer abundance and paved road density.
Conclusions: We speculate that this positive relationship is due to (1) reduced deer predation and/or perceived predation risk and/or hunting pressure in landscapes with higher road density and/or (2) provision of a resource or service by roads, the benefits of which outweigh the road mortality.
Implications: We found no evidence that road mortality places deer populations at risk of decline, at least over the range of road density values in our study. Therefore we conclude that road mortality is not a conservation concern for white-tailed deer in ecological contexts similar to our study areas.
Additional keywords: deer–vehicle collisions, habitat fragmentation, Odocoileus virginianus, Ontario, Pennsylvania, reproductive rate, road mortality.
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