2019 Volume 82 Issue 5 Pages 703-708
Sennan Satoumi Park on a reclaimed shore has attempted to improve coastal forest environment and constructed a new ecological path that connects coastal forest to shore for conservation of Chiromantes haematocheir. However, the effects of environmental improvement after 2008 on occurrence of the crabs along the coastal forest were unclear. Therefore, we compared change of occurrence, and identified effects brought by the environmental improvement. The results indicated that the path and the environmental improvement in the coastal forest had positive effects on number and range of occurrence of crabs. On the other hand, we found that spatially continuous dry sections along the coastal forest were obstructions of movement of crabs.As we confirmed that crabs have relatively high ability to migrate in daily activity, improvement of the dry sections for migration of crabs is recommended in order to mitigate impacts of predators and disasters. Ecological path and the environmental improvement in the coastal forest implemented in the present study site may be effective to enhance movement of crabs in a park on a reclaimed shore.