Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects

Highways provide commuter traffic and goods movement among regions and cities through wild, protected areas. Wildlife-vehicle collisions (WVC) can occur frequently when wildlife are present, impacting drivers and animals. Because collisions are often avoidable with constructed mitigation and reduced...

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Main Authors: Fraser M. Shilling, David P. Waetjen
Format: Article
Language:English
Published: Pensoft Publishers 2015-07-01
Series:Nature Conservation
Online Access:http://natureconservation.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=4438
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author Fraser M. Shilling
David P. Waetjen
author_facet Fraser M. Shilling
David P. Waetjen
author_sort Fraser M. Shilling
collection DOAJ
description Highways provide commuter traffic and goods movement among regions and cities through wild, protected areas. Wildlife-vehicle collisions (WVC) can occur frequently when wildlife are present, impacting drivers and animals. Because collisions are often avoidable with constructed mitigation and reduced speeds, transportation agencies often want to know where they can act most effectively and what kinds of mitigation are cost-effective. For this study, WVC occurrences were obtained from two sources: 1) highway agencies that monitor carcass retrieval and disposal by agency maintenance staff and 2) opportunistic observations of carcasses by participants in two statewide systems, the California Roadkill Observation System (CROS; http://wildlifecrossing.net/california) and the Maine Audubon Wildlife Road Watch (MAWRW; http://wildlifecrossing.net/maine). Between September, 2009 and December 31, 2014, >33,700 independent observations of >450 vertebrate species had been recorded in these online, form-based informatics systems by >1,300 observers. We asked whether or not WVC observations collected by these extensive, volunteer-science networks could be used to inform transportation-mitigation planning. Cluster analyses of volunteer-observed WVC were performed using spatial autocorrelation tests for parts or all of 34 state highways and interstates. Statistically-significant WVC hotspots were modeled using the Getis-Ord Gi* statistic. High density locations of WVC, that were not necessarily hotspots, were also visualized. Statistically-significant hotspots were identified along ~7,900 km of highways. These hotspots are shown to vary in position from year to year. For highways with frequent deer-vehicle collisions, annual costs from collisions ranged from US$0 to >US$30,000/km. Carcass clusters from volunteer data had very little or no overlap with similar findings from agency-collected WVC data, during a different time-range. We show that both state agency-collected and volunteer-collection of WVC observations could be useful in prioritizing mitigation action at US state-scales by state transportation agencies to protect biodiversity and driver safety. Because of the spatial extent and taxonomic accuracy at which volunteer observations can be collected, these may be the most important source of data for transportation agencies to protect drivers and wildlife.
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spelling doaj.art-cc2a0ac1d7a4452fb03f66501218baa62022-12-21T19:52:00ZengPensoft PublishersNature Conservation1314-69471314-33012015-07-0111416010.3897/natureconservation.11.44384438Wildlife-vehicle collision hotspots at US highway extents: scale and data source effectsFraser M. ShillingDavid P. WaetjenHighways provide commuter traffic and goods movement among regions and cities through wild, protected areas. Wildlife-vehicle collisions (WVC) can occur frequently when wildlife are present, impacting drivers and animals. Because collisions are often avoidable with constructed mitigation and reduced speeds, transportation agencies often want to know where they can act most effectively and what kinds of mitigation are cost-effective. For this study, WVC occurrences were obtained from two sources: 1) highway agencies that monitor carcass retrieval and disposal by agency maintenance staff and 2) opportunistic observations of carcasses by participants in two statewide systems, the California Roadkill Observation System (CROS; http://wildlifecrossing.net/california) and the Maine Audubon Wildlife Road Watch (MAWRW; http://wildlifecrossing.net/maine). Between September, 2009 and December 31, 2014, >33,700 independent observations of >450 vertebrate species had been recorded in these online, form-based informatics systems by >1,300 observers. We asked whether or not WVC observations collected by these extensive, volunteer-science networks could be used to inform transportation-mitigation planning. Cluster analyses of volunteer-observed WVC were performed using spatial autocorrelation tests for parts or all of 34 state highways and interstates. Statistically-significant WVC hotspots were modeled using the Getis-Ord Gi* statistic. High density locations of WVC, that were not necessarily hotspots, were also visualized. Statistically-significant hotspots were identified along ~7,900 km of highways. These hotspots are shown to vary in position from year to year. For highways with frequent deer-vehicle collisions, annual costs from collisions ranged from US$0 to >US$30,000/km. Carcass clusters from volunteer data had very little or no overlap with similar findings from agency-collected WVC data, during a different time-range. We show that both state agency-collected and volunteer-collection of WVC observations could be useful in prioritizing mitigation action at US state-scales by state transportation agencies to protect biodiversity and driver safety. Because of the spatial extent and taxonomic accuracy at which volunteer observations can be collected, these may be the most important source of data for transportation agencies to protect drivers and wildlife.http://natureconservation.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=4438
spellingShingle Fraser M. Shilling
David P. Waetjen
Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects
Nature Conservation
title Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects
title_full Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects
title_fullStr Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects
title_full_unstemmed Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects
title_short Wildlife-vehicle collision hotspots at US highway extents: scale and data source effects
title_sort wildlife vehicle collision hotspots at us highway extents scale and data source effects
url http://natureconservation.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=4438
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