Author Affiliations +
Akira CHIBA,1,* Rhyuhei HONMA,2 Yasuo SATOH3
11 Department of Biology, Nippon Dental University School of Life Dentistry at Niigata, Niigata 951–8
22 Niigata Prefecture Wild Bird Conservation Group, Shiunji, Shibata 957–0231, Japan
33 Sakata Waterfowl and Wetland Center, 5404–1 Akatsuka, Niigata 950–2261, Japan
* Corresponding author, E-mail: chiba@ngt.ndu.ac.jp