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 conditions may also decrease absolute population fitness. I am interested in the evolutionary processes of traits and their 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.
- Evolution of intraspecific diversity (personality and polymorphism) (damselfly, Drosophila)
- Scale-up effects of intraspecific diversity on population dynamics (Drosophila)
- Migration load and the evolution of species ranges
- Lack of genetic diversity and the evolution of species ranges (freshwater snail)
- Alignment of covariation of multiple traits in the different scales and the prediction of micro- and macroevolution (Drosophila)
- Rapid evolution against seasonal environmental heterogeneity (Drosophila)
- Genome editing and genetic basis of behavioral syndrome (Drosophila)
- Genetic basis of sexual polymorphism (damselfly)
- Evolution of circatidal rhythm and brackish water adaptation (freshwater snail)
- Evolutionary and plastic responses to urbanization
- Analysis of movement behavior with inverse reinforcement learning
- Morphogeometric analysis for the wing evolution in Odonata.
- 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, M. Kawata (2016) Lack of genetic variation prevents adaptation at the geographic range margin in a damselfly. Molecular Ecology, 25: 4450–4460.
- Takahashi Y., K. Takakura and M. Kawata (2016) Spatial distribution of flower color induced by interspecific sexual interaction PLoS ONE 11: e0164381
- Bybee, S., A. Córdoba-Aguilar, M. C. Duryea, R. Futahashi, B. Hansson, O. Lorenzo-Carballa, R. Schilder, R. Stoks, A. Suvorov, E. Svensson, J. Swaegers, Y. Takahashi, P. C. Watts and M. Wellenreuther (2016) Odonata (dragonflies and damselflies) as a bridge between ecology and evolutionary genomics. Frontiers in Zoology, 13:46
- Takahashi, Y. (2017) Genome-wide population genetic analysis identifies evolutionary forces establishing continuous population divergence. Ecological Research 32: 461-468. (Award paper)
- Takahashi, Y., R. Tanaka, D. Yamamoto, S. Noriyuki and M. Kawata (2018) Balanced genetic diversity improves population fitness. Proc. R. Soc. B, 285: 20172045.
- Takahashi, M., Y. Takahashi and M. Kawata (2019) Candidate genes associated with color morphs of female-limited polymorphisms of the damselfly Ischnura senegalensis. Heredity, 122: 81–92
- Takahashi, Y. and S. Noriyuki (2019) Color polymorphism influences species’ range and extinction risk. Biology Letters, 15: 20190228
- Miyaji Award, Ecological Society of Japan
- Population Ecology Young Scientist Award
- Japan Ethological Society Award
- 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” <− @)