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Bozeman Pass Post-Fencing Wildlife Monitoring.
| 题名： | Bozeman Pass Post-Fencing Wildlife Monitoring. |
| 关键词： | monitor；oring；post；life；wild；eman；pass；landscape；hotspot；install |
| 摘要： | The Bozeman Pass transportation corridor between Bozeman and Livingston, Montana, includes Interstate 90 (I-90), frontage roads, and a railroad. The highway was a suspected barrier and hazard to animal movement in the Bozeman Pass area, which is considered a corridor for wildlife moving north and south between the Greater Yellowstone Ecosystem and other habitat. In 2007, wildlife connectivity measures were incorporated into the reconstruction of a Montana Rail Link bridge. These measures included wildlife exclusion fencing along approximately one mile of I-90, four jump-outs, cattle guards, and landscape design modifications. Data on wildlife crossings and animalvehicle collisions (AVCs) were collected before and after construction to evaluate the effectiveness of the mitigation measures in reducing AVCs and allowing for animal movements under the highway. Ungulate-vehicle collisions (UVCs) decreased significantly inside the fenced roadway post-installation. There has not been a significant increase in UVC rates at either the fence ends or in the study area as a whole. Track-bed and remote camera data indicate increased wildlife movement under the MRL bridge and through culverts. An analysis of road kill density before and after fencing suggests that one road kill hotspot was been mitigated but that others remain. Suggestions for further mitigation as well as modifications to the jumpouts and fence ends are presented. Because the mitigation measures were added to a structure replacement project and largely made use of existing landscape features, the cost of the project was lower than direct installation of new mitigation measures. In three years post-fencing, the reduction in UVCs has resulted in savings that are greater than the cost of installation. Incorporating wildlife connectivity measures into scheduled road projects early in the planning stages can be a cost-effective way to reduce AVCs and preserve healthy wildlife populations. |
| 报告类型： | 科技报告 |
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