A formation process of nutrition-symbiosis system between insects and microorganisms in forests and its adaptive meaning

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To clarify why a fungus-carrying woodwasp species, Urocerus japonicus emerge from old felled trees, we investigated an oviposition experiment of U. japonicus and a fungus-isolation test from trees oviposited by U. japonicus. U. japonicus females allowed to oviposit on living Cryptomeria japonica trees. About seven months after tree-felling, the symbiotic fungus, Amylostereum laevigatum was isolated from these trees. Moreover, when U. japonicus females oviposited on felled trees in which the symbiotic fungus propagated, the next generation emerged from these trees. These results mean that U. japonicus can reproduce by no use of the maternal symbiotic fungus.