Evaluating the Suitability of Roadway Corridors for Use by Monarch Butterflies (2020) / Chapter Skim
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20 Introduction Roadside ROWs represent potential monarch habitat, but not all areas are likely to be equal in terms of potential suitability for developing or maintaining monarch habitat. Determining which roadsides are best for monarch conservation is a priority when managers are posed with options about where to focus limited resources for higher quality pollinator seed mixes or where to adopt alternative management strategies designed to enhance monarch habitat.
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Product A: Landscape Prioritization Model for Roadside Habitat for Monarchs 21 potential exposure to pesticides, to determine the overall quality of habitat for monarchs. While the goal is to develop a tool that can be used across the country, the research team could find no single land cover layer that could be used across the full range of the monarch.
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22 Evaluating the Suitability of Roadway Corridors for Use by Monarch Butterflies into an estimated milkweed stem density (Table 2 found in Thogmartin et al.
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Product A: Landscape Prioritization Model for Roadside Habitat for Monarchs 23 travel up to about 240 meters (Zalucki et al.
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24 Evaluating the Suitability of Roadway Corridors for Use by Monarch Butterflies Roadside Potential The second component of the Roadside Monarch Habitat model is the roadside characteristics. The goal of this component is to apply conceptual logic about roads that maximize the potential benefits of creating habitat along roadsides while minimizing risks to monarchs.
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Product A: Landscape Prioritization Model for Roadside Habitat for Monarchs 25 average beneficial habitat within a radius of 120 meters, a distance derived from the single maximum step distance from Zalucki et al.'s (2016) paper on monarch movement.
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26 Evaluating the Suitability of Roadway Corridors for Use by Monarch Butterflies for intermediate speeds and one with slow or fast speeds. The team also assumed that collision risk along roadside i, Vi, increases with traffic volume (McKenna et al.
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Product A: Landscape Prioritization Model for Roadside Habitat for Monarchs 27 Roadside Suitability Overall Overall Roadside Suitability (Ri) The research team determined the overall Roadside Suitability Index by taking the average of the components of the habitat and roadside potential metrics separately and then weighting the two major factors (habitat and roadside potential)
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28 Evaluating the Suitability of Roadway Corridors for Use by Monarch Butterflies they are more suitable from a risk mitigation standpoint. Built with Esri ArcGIS software to foster usability, the tool combines national-level datasets, published literature, and expert opinion into a model that estimates monarch habitat quality across the entire landscape and relates those estimates to individual roadsides.
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