Relative importance of biological and human-associated factors for alien plant invasions in Hokkaido, Japan
Chika Egawa1,*, Takeshi Osawa1,2, Tomoko Nishida3 and Yasuto Furukawa4
1 Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan 2 Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan 3 Headquarters, National Agriculture and Food Research Organization, 3-1-1 Kannondai, Tsukuba, Ibaraki 305-4517, Japan 4 Rakuno Gakuen University, 582 Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
*Correspondence address. Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan. Tel: +81-29-838-8271; Fax: +81-29-838-8271; E-mail: cegawa@affrc.go.jp