Limitation of research area otters

Delimitation of the research area of otters in Alblasserwaard. A map with distinguishing potential habitats and migratory routes and a map with all bottlenecks, categorized by priority. A traffic bottleneck occurs when there is a reasonable chance of traffic casualties at a location within or between current habitats (Kuiters & Lammertsma, 2014). When assessing the urgency of a traffic bottleneck, the following considerations have been taken into account: 1. The suitability of the watercourse and riparian zone as a migration route for the otter. 2. The type of road (municipal, provincial or state road). 3. The maximum speed on the road in question (from 60 km/h fatal). 4. The presence of an underpass and its size and type. 5. The presence of obstacles in the underpass. 6.The presence of accompanying grids along the road. The map of the Netherlands Nature Network (NNN) looked at the extent to which the potential habitats and migration routes correspond to the ecological connection that has/will be realized.阿尔布拉瑟瓦尔德（Alblasserwaard）水獭研究区域的划定工作。包含两类地图：其一为辨识潜在栖息地与迁徙路径的地图，其二为按优先级分类的所有瓶颈点位地图。根据Kuiters与Lammertsma（2014）的定义，交通瓶颈指在现有栖息地内部或栖息地之间的某一区域，存在发生水獭交通致死事故的较高可能性。在评估交通瓶颈的紧迫性时，已纳入以下考量因素：1. 水道及河岸带作为水獭迁徙路径的适宜性；2. 道路类型（市级、省级或国家级道路）；3. 目标道路的最高限速（60km/h及以上时存在致命风险）；4. 地下通道的存在情况，及其尺寸与类型；5. 地下通道内是否存在障碍物；6. 道路沿线是否配有防护格栅。荷兰自然网络（Netherlands Nature Network, NNN）绘制的地图，评估了潜在栖息地与迁徙路径与已实现或拟实现的生态连通性的契合程度。