United States Department of Transportation
i
Evaluating Fall Monarch Butterfly Roadkill Hotspot Incidence and Potential Roadkill Mitigation
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2022-04-22
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[PDF-454.09 KB]
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Abstract:Five continuous years of MaxEnt model projections for fall monarch roadkill in the Texas Central Funnel from 2016 to 2020 agree with simple extrapolations in revealing a biennial cycle of higher roadkill in the even-numbered years of 2016, 2018, and 2020, representing about 2.5% of the monarch overwintering population. In contrast, roadkill represented only 0.8% of the overwintering population in odd-numbered years of 2017 and 2019. Annual MaxEnt monarch roadkill models generally agree in projecting perennial monarch roadkill hotspot regions in both the Texas Central and Coastal Funnels. Spring monarch roadkill was never more than half the fall monarch roadkill seen in odd numbered years and could be less than 10% of that seen in even numbered years.
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