Roadkill
Roadkill is the death of animals in collisions with road vehicles. It is a widespread form of wildlife mortality caused by roads and traffic.
Road ecology: The study of how roads and traffic affect ecological processes and wildlife. It explains how roads turn animal movement into a recurring source of mortality.
Wildlife population decline: A sustained reduction in the number of individuals in a wildlife population. Repeated road deaths can reduce populations, especially when they kill breeding adults.
Roadkill hotspot: A road segment where wildlife-vehicle collisions occur more frequently than on surrounding segments. Hotspot mapping helps target limited mitigation funds to high-risk locations.
Amphibian migration: Seasonal movement of amphibians, often between terrestrial habitat and breeding wetlands. Mass migrations across roads can produce concentrated seasonal mortality.
Carcass persistence: The length of time an animal carcass remains detectable at a location before removal or decomposition. Rapid carcass removal makes roadside counts underestimate actual deaths.
Wildlife crossing structure: A bridge, tunnel, or other passage designed to let wildlife cross a transportation corridor safely. These structures separate animal crossings from vehicle traffic.
Habitat fragmentation: The breaking of continuous habitat into smaller, more isolated patches. Roads both kill animals and divide the habitats their populations depend on.
Roadkill survey: A systematic effort to record animal carcasses along roads over a defined period. Surveys reveal where and when collisions occur, while accounting for imperfect detection.
Turtle road mortality: Deaths of turtles struck by vehicles while crossing roads, often during seasonal movements. Slow movement and nesting migrations make turtles especially exposed on roads.
Roadkill detection probability: The probability that a survey detects a carcass that is present along a road. Detection varies with carcass size, survey method, vegetation, and observer skill.