| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Research Abstract |
Bitterling fishes deposit their eggs on the gills of living mussels using a long ovipositor. Bitterling egg shape is highly variable and may have an adaptive significance in preventing ejection by mussel hosts. We examined whether egg shape among populations of the tabira bitterling (Acheilognathus tabira) in Japan correlated with differences in host mussel species in the family Unionidae. Bitterling populations using mussels in the sub-family Anodontinae possessed longer ovipositors and more elongated eggs than those using mussels in the Unioninae. Based on a robust phylogeny of A.tabira populations, we demonstrated that evolution of elongated and globular eggs has occurred repeatedly in different A.tabira lineages corresponding with the use of anodontine and unionine mussels. The evolution of both ovipositor length and egg shape were correlated with host differences, but not with each other, suggesting that these traits have been selected independently.
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