| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
An parasitic digenean Genarchopsis goppo, which parasitizes almost all species of the freshwater snails (genus Semisulcospira) in Lake Biwa, shows some variations in host specificity among localities. As the result of experimental infections and molecular phylogenetic analysis, at least two cryptic species were discovered in Lake Biwa and one of the tributaries. The susceptibility of a host species did not vary among local populations. This result suggests that the host-parasite association between G.goppo and Semisulcospira is the consequence of their speciation.
The molecular genetic study suggested the presence of genetic penetration among host species. Therefore, their genetic diversity cannot be compared simply by the haplotypes. The genetic divergence through interbreeding and its effect on the susceptibility are the goal of the further studies.
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