Community level invasional meltdown in exotic tree plantation

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Japanese larch (Larix kaempferi Carr.) was introduced into northern Japan from central Japan about 110 years ago. Since then, larch plantations have been widely established, and now occupy 460,000ha or 30% of the total man-made forests in Hokkaido, the northern-most island of Japan. We compared moth assemblages in native area (central Japan) to those in introduced area (northern Japan) to adress the following two questions : (1) do non-native tree plantations facilitate establishment of other exotic species? and (2) how non-native tree plantations affect native biodiversity? We found that non-native larch plantations facilitate invasion of exotic larch feeding moths and that effects of larch plantations on native moth diversity do not differ between native and introduced area.