Funding for this research was provided by:
Rural Development Administration, Republic of Korea (No.: PJ01135201)
Ministry of Agriculture, Food and Rural Affairs, Republic of Korea (120054021HD020)
Received: 21 November 2020
Accepted: 11 March 2021
First Online: 20 March 2021
: All work reported in this study was carried out under license from the Korea National Park Service (permits SRTI-1727, 2783, 2924 and 3301).
: Not applicable.
: The authors declare that they have no competing interests.