| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
The objective of our research is to elucidate the range expansion pattern of invasive soil invertebrates in the United States. We used one of the earthworm species, Amynthas agrestis (Megascolecidae), which has invaded to the United States from Japan, as a model species. We conducted molecular analyses for this species collected in Japan and US. The phylogenic tree constructed in our study supported that A. agrestis has invaded to US from Japan. However, the invasion history and the range expansion pattern were not clear because of the low phylogenetic differentiation among the sites in Japan and in the US. In our study, we newly found that another species, A. irregularis, has also invaded from Japan.
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