Uncontrolled wildfires are occurring with increasing frequency across western North America due to a combination of wildfire suppression, climate change, impacts from mountain pine beetles (Dendroctonus ponderosae), alterations in range composition by nonnative grasses, and human population growth in fire-prone landscapes. A poorly studied mechanism of wildland fire ignitions occurs when a bird perched on an overhead power line is electrocuted, its plumage ignites, and the burning bird falls into and ignites dry vegetation. Avian-caused ignitions have been occasionally documented, but not spatially analyzed in the contiguous United States. We hypothesized that spatial analyses could demonstrate specific regions where ignitions from avian electrocutions occur most frequently. To test our hypothesis, we compared public reports of wildland fires ignited by bird electrocutions to Environmental Protection Agency ecoregions.We found reports of 44 wildland fires ignited by avian electrocutions in the contiguous U.S. from January 2014 to December 2018. The Mediterranean California ecoregion had the highest density of avian-caused fires. It would be prudent for electric utilities in the Mediterranean California ecoregion in the U.S., and in fire-prone landscapes globally, to develop fire mitigation plans that include modifying power poles to reduce risk of avian electrocutions and resulting wildfires.

No abstract