Current distribution of racoon (Procyon lotor) in Toyama Prefecture, Japan, inferred from claw marks of racoon and camera traps

Abstract

The racoon (Procyon lotor) is an invasive alien species with an expanding distribution throughout Japan. Given that racoons have a negative impact on ecosystems and agricultural crops, management and control of their population is required. In Toyama Prefecture, where the distribution has not been clearly defined, we investigated the current distribution based on claw marks of the racoon and camera traps. We found claw marks of them at 94 (48.7%) of 193 survey sites in the lowlands of Toyama Prefecture. The 94 sites were located in the eastern and western areas of the prefecture. We also recorded one incidence using a camera trap survey, suggesting a low population density of racoon in Toyama Prefecture. Our results showed that within different areas of Toyama Prefecture, the population density of racoons varied. Thus, it is necessary to devise management strategies that are specific to each area.