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原文传递 Effectiveness of Vertebrate Passage and Prevention Structures: a Study of Boeckman Road in Wilsonville.

题名：	Effectiveness of Vertebrate Passage and Prevention Structures: a Study of Boeckman Road in Wilsonville.
作者：	de Rivera-C.E.; Bliss-Ketchum-L.L.
关键词：	Wildlife-management; Roads-.;Wildlife-movement; Vertebrates-; Methods-; Sampling-; Data-analysis; Comparisons-; Habitats-.
摘要：	One of the most obvious impacts roads have on the natural world is direct mortality to individual animals that attempt to cross roads. A less obvious but likely more important impact of roads on many species is habitat fragmentation. The ability for individuals to travel between subpopulations is the key to genetic diversity as well as ultimately the survival of the species. Considering these impacts and management goals to increase habitat connectivity, increased attention has been given to creating road design that reduces wildlife collisions. Most studies, however, have been in other countries or regions and most focus on connectivity for just one or a few species and rarely in urban settings. This study examines the effectiveness of a variety of under-road passage structures for a community of animals in an urban wetland. Wildlife passage was taken into great consideration in the construction of the Boeckman Road Extension, the new road (2006) in Wilsonville, Oregon, examined in this study. As a result it includes a bridge, two box culverts and eleven round concrete culverts to facilitate wildlife passage as well as a mammal fence atop an amphibian/reptile wall. In order to monitor passage use we used a combination of sand-track monitoring and motion-detect cameras. We compared passage structure use to movement in the habitats surrounding the road by monitoring four habitat transects in addition to the passage structures (Road transect). We also conducted tag and release studies targeted to small mammals. Finally, camera data collected in passage structures were compared to camera monitoring at the end of the exclusionary fencing. This study highlights the effectiveness and potential problems (and possible fixes) of some of the passage and prevention structures. Including passage and prevention structures such as these in road design is imperative for habitat connectivity and the need for this becomes even more apparent as Oregon's native wildlife face an ever increasing urban landscape as well as the potential impacts of climate change.
报告类型：	科技报告