Nonnative brown trout invasion into native white-spotted charr sanctuary in Monbetsu stream, Hokkaido, Japan
KOH HASEGAWA1 AND KOJI MAEKAWA2*
1National Research Institute of Fisheries Science, Fisheries Research Agency, Nikko, Tochigi 321-1661, 2Laboratory of Conservation Biology, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Hokkaido 060-0809, Japan