Masato Yamamichi

Associate Professor, National Institute of Genetics, Research Organization of Information and Systems *Profile is at the time of the award.

2024Inamori Research GrantsBiology & Life sciences

researchmap

Research topics: Rapid evolution and coexistence dynamics: Theory and experiments

Keyword

Summary: Stable coexistence of many species despite competition for shared resources has been a central topic in ecology. On the other hand, recent studies have revealed that organisms can rapidly adapt to changing environments through evolution. Here we examine how rapid evolution can promote species coexistence by combining microcosm experiments and mathematical model analyses.

Message

I am very honored to receive the Inamori Research Grant. I would like to develop an interesting research project by integrating ecology, evolutionary biology, and population genetics.

Outline of Research Achievments

To understand the effects of rapid evolution on species coexistence, we first conducted mathematical modeling analyses. We found that rapid evolution of a prey defense trait drives population cycles, thereby promoting stable coexistence of predator species. Then, to verify the theoretical predictions, we established a laboratory microcosm containing phyto- and zooplankton. In the process, we revealed the effects of environmental fluctuations on adaptation and quantified the trait-mediated indirect effects of environmental stress.

Masato Yamamichi (2026) Higher genetic variance of prey defence promotes fluctuation-dependent species coexistence Biology Letters 22 (3) https://doi.org/10.1098/rsbl.2025.0626

Shota Shibasaki, Masato Yamamichi (2026) The double-edged effect of environmental fluctuations on evolutionary rescue Evolution https://doi.org/10.1093/evolut/qpag034

Shota Shibasaki, Masato Yamamichi (2025) Quantifying a trait-mediated indirect effect of an environmental stressor on predator-prey dynamics bioRxiv doi: https://doi.org/10.1101/2025.09.04.674171

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