Evolutionary changes, which are caused by both selection and genetic drift, should affect population-level absolute fitness and thus can potentially alter the dynamics of populations. Natural selection, which favors individuals having higher relative fitness, is typically expected to increase the average absolute fitness and population productivity. On the other hand, in some situations, natural/sexual selection is suggested to decrease population productivity and increase extinction risk, which is exemplified by cases such as the tragedy of the commons, evolutionary suicide or extinction. Gene flow among populations with different environmental condition may also decrease population absolute fitness. I am interested in the evolutionary processes of traits and its side effects on demographic dynamics. Quantifying the role of evolutionary changes on overall population performance will increase our understanding of ecological dynamics including demography, range expansion, community dynamics, ecosystem function and extinction risk and elucidate how these processes in turn affect macroevolutionary dynamics.
- Ecological consequences of adaptive evolution of genetic diversity (damselflies and fruit fly)
- Mechanism establishing geographic cline in qualitative and quantitative traits (damselflies)
- Niche segregation and the evolution of adaptive trait complex (damselflies)
- Evolution and ecology of species range limits (fresh water snail and damselflies)
- Reproductive interference and species assembly in plants
- Genetic basis and its evolution of color polymorphisms (plant and damselfly)
Takahashi, Y. and M. Watanabe (2009) Diurnal changes and frequency dependence in male mating preference for female morphs in the damselfly, Ischnura senegalensis (Rambur) (Odonata: Coenagrionidae). Entomological Science, 12: 219–226.
Takahashi, Y. and M. Watanabe (2010) Diurnal changes in male mate preference to female dimorphism in Ischnura senegalensis (Rambur) (Zygoptera: Coenagrionidae). Odonatologica, 39: 145–148.
Takahashi, Y. and M. Watanabe (2010) Female reproductive success is affected by selective male harassment in the damselfly Ischnura senegalensis. Animal Behaviour, 79: 211–216.
Takahashi, Y. and M. Watanabe (2010) Mating experience affecting male discrimination between sexes and female morphs in Ischnura senegalensis (Rambur) (Zygoptera: Coenagrionidae). Odonatologica, 39: 47–56.
Takahashi, Y. and M. Watanabe (2010) Morph-specific fecundity and egg size in the female-dimorphic damselfly Ischnura senegalensis. Zoological Science, 27: 325–329.
Takahashi, Y., J. Yoshimura, S. Morita and M. Watanabe (2010) Negative frequency-dependent selection in female color polymorphism of a damselfly. Evolution, 64: 3620–3628
Takahashi, Y. and M. Watanabe (2011) Male mate choice based on ontogenetic colour changes of females in the damselfly Ischnura senegalensis. Journal of Ethology, 29: 293–299.
Takahashi, Y., S. Morita, J. Yoshimura and M. Watanabe (2011) A Geographic cline induced by negative frequency-dependent selection. BMC Evolutionary Biology, 11: 256.
Takahashi, Y., G. Morimoto and M. Watanabe (2012) Ontogenetic colour change in females as a function of antiharassment strategy. Animal Behaviour, 84: 685–692.
Takahashi, Y. and M. Watanabe (2013) Time constraints related to sexual maturation and prolonged copulation in the female-dimorphic damselfly Ischnura senegalensis. Entomological Science, 16: 34–39.
Takahashi, Y. and M. Kawata (2013) A comprehensive test for negative frequency-dependent selection. Population Ecology, 55: 499–509.
Takahashi, Y. and M. Kawata (2013) Alternative trait combinations and secondary resource partitioning in sexually selected colour polymorphism. Ecology and Evolution, 3: 2038–2046.
Takahashi, Y., N. Nagata and M. Kawata (2014) Antagonistic selection factors induce a continuous population divergence in a polymorphism. Heredity, 112: 391–398.
Takahashi, Y., K. Kagawa, E. I. Svensson and M. Kawata (2014) Evolution of increased phenotypic diversity enhances population performance by reducing sexual harassment in damselflies, Nature Communications, 5: 4468. (Nature Communications Biology Selections, Vol. 1, No. 5)
Katayama, N., J. K. Abbott, J. Kjærandsen, Y. Takahashi and E. I. Svensson (2014) Sexual selection on wing interference patterns in Drosophila melanogaster, Proceedings of the National Academy of Sciences of the United States of America, 111: 15144–15148.
Takahashi, Y. (2015) Mechanisms and tests for geographic clines in genetic polymorphisms. Population Ecology, 57: 355-362.
Takahashi, Y., K. Takakura and M. Kawata (2015) Flower color polymorphism maintained by overdominant selection in Sisyrinchium sp. Journal of Plant Research, 128: 933–939.
Takahashi, Y., Y. Suyama, Y. Matsuki, R. Funayama, K. Nakayama and M. Kawata (2016) Lack of genetic variation prevents adaptation at the geographic range margin in a damselfly. Molecular Ecology (in press)
- Young Scientist Award of the Ecological Society of Japan (Suzuki Award) (2013)
- AAAS/Science Program for Excellence in Science (2011–2013, AAAS)
- Poster Presentation Award (Society of Population Ecology)
- Poster Presentation Award (Ecological Society of Japan)
- Outstanding Presentation Award (5th WDA International Symposium of Odonatology)
Works and Education
2008.04–2010.11 | JSPS Research Fellow (DC1) at University of Tsukuba
2010.12–2011.03 | JSPS Research Fellow (PD) at University of Tsukuba
2011.04–2013.03 | JSPS Research Fellow (PD) at Tohoku University
2013.04–2016.07 | Assistant professor at Tohoku University
2013.04–presen | Assistant professor at Chiba university
2002. 4–2006. 3 | B.Sc. (Univrsity of Tsukuba)
2006. 4–2010. 11 | Ph.D. (Univrsity of Tsukuba)
Faculty of Science, Chiba University, Japan
1-33, Yayoicho, Inage, Chiba, Chiba, 263-8522 Japan
takahashi.yum”at”gmail.com (“at” <− @)