ABSTRACT

Roadkill poses a significant threat to many wildlife species. To implement habitat management and conservation measures in protected areas, it is important to identify the factors related to roadkill at the landscape scale. The purpose of this study was to clarify the landscape factors involved in roadkill of the endangered Ryukyu long-furred (Diplothrix legata) rat in Yambaru, the northern Okinawa-jima Island, Japan. We analyzed the relationship between roadkill sites and landscape factors (evergreen broad-leaved forest area, artificial pine forest area, average vegetation height, and minimum radius of road curve) using a generalized linear model, incorporating spatial autocorrelation using Moran’s eigenvector maps along a 13.9 km route using census data from May 2011 to April 2017. In addition, we clarified the relationship between the number of roadkills and national park zoning. Roadkill incidence was found to be positively correlated with average vegetation height and the percentage of pine forest area. The number of roadkill incidents was also higher in zones with higher levels of protection compared to areas with lower or no protection. These results suggest the need for measures in areas containing these landscape elements, such as mature forests and higher percentage of pine forests.

摘要

Roadkill对许多野生生物构成了重大威胁。为了在保护区实施栖息地管理和保护措施，重要的是在景观范围内确定与道路杀伤有关的因素。这项研究的目的是弄清与濒临灭绝的琉球（Ripukyu legata）道路杀害有关的景观因素）日本北部冲绳岛岛延巴鲁的老鼠。我们使用广义线性模型分析了道路杀伤点与景观因子（常绿阔叶林面积，人工松林面积，平均植被高度和最小道路半径）之间的关系，并使用Moran特征向量图沿13.9纳入了空间自相关性km路线使用2011年5月至2017年4月的人口普查数据。此外，我们阐明了道路杀伤次数与国家公园分区之间的关系。发现道路杀伤发生率与平均植被高度和松林面积百分比呈正相关。与防护等级较低或没有防护等级的地区相比，防护等级较高的地区的道路杀人事件的数量也更高。