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Roads have wide-ranging impacts on wildlife populations and negative impacts have been documented far beyond the footprint of the roadway. Design, management, location and use of roads have varying impacts on different species. The Oregon silverspot butterfly (Speyeria zerene hippolyta) is a threatened butterfly species that has been extirpated from most of its range along the west coast of the United States. One site (Rock Creek-Big Creek) where a small population of S. z. hippolyta remains is bisected by Highway 101, a two-lane highway that is used most during the summer tourist season which coincides with the flight season of the S. z. hippolyta. Habitat resources are found on both sides of the highway and past researchers have observed road crossings and vehicle-caused mortality. Experimental tests were conducted to test vegetative hedgerows as a mitigation strategy to increase flight height of S. z. hippolyta over the road and decrease vehicle-caused road mortality. Three-meter tall nets were used in the study design to mimic vegetative hedgerows as a guiding barrier within the flight path. The guiding barrier nets placed in the flight path of S. z. hippolyta did not significantly reduce connectivity through a corridor (76% traveled the corridor with a net in place). However, these nets did not significantly increase flight height (net: 1.01 m vs. no net: 0.83 m) and may increase the number of individuals that land on the roadway (net:19% vs. no net: 7%). Further, none of the sampled individuals flew at a height of 3 meters over the guiding barriers, and only 7% flew at a height of 2.5 meters or more. Results suggest that vegetative guiding barriers alone may not be a sufficient mitigative solution to increasing safe flight height across the highway for S. z. hippolyta. Introduction Commonly, mitigation strategies to reduce road mortality are designed to aid large vertebrates or mammals that cause economic damage and possible human death when vehicle strikes

Connecting Habitat Across Roads: Field Testing Mitigation Strategies for Reducing Road Mortality of an Imperiled Butterfly