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A Quick Guide to Roadkill the Bad News the Good News Species of Roadkill in Vermont

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A Quick Guide to Roadkill the Bad News the Good News Species of Roadkill in Vermont A Quick Guide to Analysis of Priority Areas Along Vermont Highways For Wildlife Crossings Roadkill Overview Step 2: Determining Roadkill/Traffic Relationships Step 5: Locating Water Supplies Distance to Water Bodies The Bad News As development and demand for more infrastructure increases, we 1. Combined Roadkill Density map and Average Annual Daily Traffic Near Previously Determined Priority 1,000,000-Number of vertebrates run over will continue to build roads and consequently fragment wildlife Count raster data into a new layer called “TrafficKill.” Areas 1. Created a distance to water each day in the United States (11.5 habitats. Animals will be forced to cross highways to access their en- vertebrates every second) This layer showed the relationship between traffic and roadkill counts on each bodies map 253,000- Number of reported animal- tire habitat, putting their and our lives in danger. Thus, it is imperative highway in Vermont and assigned a particular value to each possible 2. Combined the map with the vehicle accidents annually that animal-vehicle collision mitigation plans are incorporated into combination. The results are reflected the following matrix. Thus, areas with previous layer to determine 90- Percent of transportation design projects. In this study, I assess priority areas high traffic and high roadkill counts were given a value of 44, low traffic and where water bodies lie in the collisions in- along Vermont highways for wildlife crossing development based on low roadkill areas were given 11, etc. vicinity of Vermont highways volving deer roadkill, transportation, wildlife crossing values, and land use data. I 200- Number feel that the best areas for wildlife crossing development are those Animal habitats require a supply of High Traffic Moderately Moderately Low Traffic water, and so more species will be of humans with relatively high traffic and roadkill counts. In addition, these Roads (40) High Traffic Low Traffic Roads (10) killed annually highways must be surrounded by forest, have a Wildlife Crossing Roads (30) Roads (20) found in areas near a water body. from animal- Value ≥ 8, and should be a minimum of 500m from a water source. High roadkill 44 34 24 14 Thus, a wildlife crossing should be vehicle area (4) built connecting forested areas that collisions Moderately 43 33 23 13 contain a water source. $2,000- Average minimum cost for Methodology High roadkill Distance in Meters repairing a vehicle after a collision with a area (3) 0 - 287 deer Step 1: Convert Vector to Raster Data Moderately low 42 32 22 12 288- 555 Roadkill roadkill area (2) 556 - 900 200,000,000- Annual cost to society for fa- ¯ 901 - 4,880 talities and injuries resulting from animal 1. Selected roadkill for the years 2000-2006 to provide the most Low roadkill 41 31 21 11 collisions current analysis area (1) 2. Selected the top species of roadkill in Vermont: Deer, Moose, and Step 6: Final Selection of Priority Areas Bear (the following analysis will be on these species only) I decided to focus on the highlighted values for the remainder of my analysis 1. Selected for areas with Moderate to High Roadkill and The Good News 3. Created a density map of roadkill in Vermont because wildlife crossings should be placed where there are relatively high Moderate to High Traffic surrounded by forest AND roadkill counts. I found that roads with relatively high traffic experience 2. With a Wildlife Crossing Value ≥ 8 AND 93- Percent by which desert tortoise roadkill higher rates of roadkill than roads with low traffic. 3. Within 500 m from a water body was reduced after installation of a wildlife Roadkill on Vermont Highways Roadkill Density culvert on a stretch of the Mojave Desert Wildlife Crossing Priority Areas in Vermont highway Step 3: Locating Forest Cover in Areas Surrounding Vermont Highways 40- Percent by which deer roadkill was 1.Combined Vermont Land Cover with “TrafficKill” layer to determine reduced after a deer wildlife crossing was where highways with selected traffic and roadkill relationships are built in northeast Utah. surrounded by forest HR3550- the name of the transportation bill that would require Since most of the roadkill species in Vermont live in forests, they most likely §¨¦I091 states to plan for died attempting to reach forest habitat on the other side of the highway. wildlife crossings Therefore, these species would benefit the most from a wildlife bridge when constructing connecting two forests. Burlington .! South Burlington .! highways §¨¦I089 .! Land Cover in Vermont Road Segments with Forest Montpelier Cover on Both Sides Species of Roadkill Roadkill Count in Vermont Roadkill by Species per Square Mile Bear High Deer .! Moose Rutland Wide Ranging, Large Carnivores ¯ Low and Slow Moving Animals: ¯ ADTC for 2002 Bear Top Three: Deer, Beaver Moose, Bear Deer U007tu Large Bird .! Major Cities V009tu Final Selection Priority Areas Mink Major Roadways With the Most Priority Sites Moose Open Water Traffic Data Developed Various Roadkill and Otter Barren Land (Rock/Sand/Clay) Traffic Combinations ¯ Forest 1. Converted Annual Average High RK/High T Shrub/Scrub Turtle High RK/ Mod High T Limitations and Conclusions Daily Traffic Count (ADTC) Wetland Pasture/Hay Mod High RK/ High T Mod High RK/ Mod High T Some limitations include data currency, as no layer includes data after Statistics for 2002 into raster Cultivated Crops ¯ Cartographer: Alissa Marturano data ¯ 2006. In addition, the accuracy of the roadkill data is +/- .5 miles, which is a December 12, 2008 Tufts University Urban and Environmental 2. Visualized which highways in significant distance. If some the roadkill data points are off, it will affect Policy and Planning Vermont have the most traffic real life applicability of my project, since roadkill may be represented in an Map Coordinate System and Projection: Step 4: Incorporating Wildlife Crossing Value (WCV) (see Marturano 2008 for area where it actually has not been found. Finally, there are other many Vermont State Plane 1983/ Transverse Mercator detailed definition) important variables that should be considered in assessing wildlife crossing Resources: Vermont Center for Geographic Number of Cars on 1. Used WCV layer created by biologists in Vermont, which ranked Vermont Highways placement. These include deer wintering areas, roadway widths, elevation, Information www.vgci.org highway segments in terms of animal migrations from 5–9, with 9 being 0 - 3400 and current bridge locations. US Department of Transportation Federal 3401 - 7600 the highest 7601 - 13100 My final selection identified 62 potential areas for wildlife crossing Highway Administration 2. Combined this layer with forested “TrafficKill” layer so that road See Marturano 2008 for more detailed information on 13101 - 22700 development. These findings reveal that Vermont has ample sites to begin 22701 - 51100 segments in question were coded with their corresponding WCV background and analysis ¯ implementing conservation efforts into traffic design and policy. .
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