Elucidating the role of tannins included in seeds of oak trees in relation to interactions with seed consumers.

为了阐明栎种子化学成分的生态作用，对10种栎种子中的化学物质（主要营养成分和单宁）含量进行了分析。结果发现，即使在密切相关的物种中，化学成分也存在显着的种间和种内差异。此外，非结构性碳水化合物和单宁含量之间存在权衡关系。此外，还证明了种子性状通过与种子消费者的相互作用对种子命运产生实质性影响，从而影响母树的繁殖成功。

In order to clarify the ecological role of seed chemical compositions of oaks Quercus spp., the content of chemicals(major nutrients and tannins) in seeds were analyzed for 10 species of Japanese oaks. As a result, notable inter-and intraspecific variations in chemical compositions were found even among closely related species. Further, a trade-off was recognized between the contents of nonstructural carbohydrates and tannins. In addition, it was proved that seed traits had substantial influences on seed fates and thereby the reproductive success of the mother trees via interactions with seed consumers.