| 要旨トップ | 本企画の概要 | 日本生態学会第64回全国大会 (2017年3月、東京) 講演要旨
ESJ64 Abstract


シンポジウム S05-5  (Lecture in Symposium)

時間的変化する資源補償が河川生態系に及ぼす影響:森林-河川生態系研究の新たな展開にむけて(The effects of Temporally Variable Resource Subsidies on Stream Ecosystems: Looking beyond the Nakano’s Legacy for Stream-Forest Linkages)

*Takuya SATOH(神戸大学大学院理学研究科)

When I was a master student, I came across a paper showing that forest and stream ecosystem seasonally subsidize each other (Nakano & Murakami 2001 PNAS). Even today-10 years later, it is the most beautiful paper that I have ever read. In the meanwhile, I luckily found that a parasite (Nematomorph) drives strong seasonal subsidy for trout in the form of terrestrial insects that are manipulated by the parasite in mountainous streams in Japan. On the basis of the Nakano’s paper and my own field observation, I am now studying how stream salmonids and their communities live in seasonal environments. We conducted field experiments, in which we directly altered peak timing of the terrestrial insect inputs into streams, in Canada and Japan. In both experiments, we found that subsidies occurring at the early in the growing season can have pronounced effects on trout’s growth trajectory and age at maturity, compared with the subsidies occurring at the latter season. I would discuss how we could integrate this timing-dependent consumer response into a general framework to understand dynamics of populations and communities in seasonally interacting ecosystems.


日本生態学会