Our footprints.

1. Takagi, K. and K. Ohashi (2024) Realized flower constancy in bumble bees: optimal foraging strategy balancing cognitive and travel costs and its possible consequences for floral diversity. bioRxiv 2024.04.08.588636;

2. Jirgal, N., and K. Ohashi (2023) Effects of floral symmetry and orientation on the consistency of pollinator entry angle. The Science of Nature - Naturwissenschaften 110: 19.

3. Ohashi, K., A. Jürgens, and J. D. Thomson (2021) Trade-off mitigation: a conceptual framework for understanding floral adaptation in multispecies interactions. Biological Reviews 96(5): 2258-2280.  [Lay summary][News release]

4. Ohashi, K. and A. Jürgens (2021) Three options are better than two: compensatory nature of different pollination modes in Salix caprea L. Journal of Pollination Ecology –SCAPE Special Issue– 28(2021): 75-90. [Lay summary] [Appendix]
5. Funamoto, D. and K. Ohashi (2017) Hidden floral adaptation to nocturnal moths in an apparently bee-pollinated flower, Adenophora triphylla var. japonica (Campanulaceae). Plant Biology 19(5): 767-774.
6. Makino, T. T. and K. Ohashi (2017) Honest signals to maintain a long-lasting relationship: floral colour change prevents plant-level avoidance by experienced pollinators. Functional Ecology 31(4): 831-837.
7. Ohashi, K., T. T. Makino, and K. Arikawa (2015) Floral colour change in the eyes of pollinators: testing possible constraints and correlated evolution. Functional Ecology 29(9): 1144-1155.
8. Suzuki, M. F. and K. Ohashi (2014) How does a floral colour-changing species differ from its non-colour-changing congener? - a comparison of trait combinations and their effects on pollination. Functional Ecology 28(3): 549-560. Note: this article has been selected for a cross-journal virtual issue on Pollination Ecology (2014) in Functional Ecology (
9. Ohashi, K., A. Leslie, and J. D. Thomson (2013) Trapline foraging by bumble bees: VII. Adjustments for foraging success following competitor removal. Behavioral Ecology 24(3): 768-778.
10. Ohashi, K. and J. D. Thomson (2013) Trapline foraging by bumble bees: VI. Behavioral alterations under speed accuracy trade-offs. Behavioral Ecology 24(1): 182-189.
11. Ohashi, K., D. D'Souza, and J. D. Thomson (2010) An automated system for tracking and identifying individual nectar foragers at multiple feeders. Behavioral Ecology and Sociobiology 64(5): 891-897.
12. Ohashi, K. and J. D. Thomson (2009) Trapline foraging by pollinators: its ontogeny, economics and possible consequences for plants. Annals of Botany 103(9): 1365-1378.
13. Ohashi, K., A. Leslie, and J. D. Thomson (2008) Trapline foraging by bumble bees: V. Effects of experience and priority on competitive performance. Behavioral Ecology 19(5): 936-948.
14. Kawaguchi, L. G., K. Ohashi, and Y. Toquenaga (2007) Contrasting responses of bumble bees to feeding conspecifics on their familiar and unfamiliar flowers. Proceedings of the Royal Society B. 274(1626): 2661-2667. Note: this article has been selected as one of "The most interesting papers published in the biological sciences" by Dr. Thomas S. Collett (University of Sussex) in Faculty of 1000 Biology.
15. Yoshioka, Y., K. Ohashi, A. Konuma, H. Iwata, R. (2007) Ability of bumblebees to discriminate differences in the shape of artificial flowers of Primula sieboldii (Primulaceae). Annals of Botany 99(6): 1175-1182.
16. Makino, T. T., K. Ohashi, and S. Sakai (2007) How do floral display size and the density of surrounding flowers influence the likelihood of bumble-bee revisitation to a plant? Functional Ecology 21(1): 87-95.
17. Ohashi, K., J. D. Thomson, and D. D'Souza (2007) Trapline foraging by bumble bees: IV. Optimization of route geometry in the absence of competitors. Behavioral Ecology 18(1): 1-11.
18. Kawaguchi, L. G., K. Ohashi, and Y. Toquenaga (2006) Do bumble bees save time when choosing novel flowers by following conspecifics? Functional Ecology 20(2): 239-244.
19. Saleh, N ., K. Ohashi, J. D. Thomson, and L. Chittka (2006) Facultative use of repellent scent mark in foraging bumblebees: complex vs. simple flowers. Animal Behaviour 71(4): 847-854.
20. Ohashi, K. and J. D. Thomson (2005) Efficient harvesting of renewing resources. Behavioral Ecology 16(3): 592-605.
21. Ohashi, K. (2002) Consequences of floral complexity for bumble-bee-mediated geitonogamous self pollination in Salvia nipponica Miq. (Labiatae). Evolution 56(12): 2414-2423.
22. Ohashi, K. and T. Yahara (2002) Visit larger displays but probe proportionally fewer flowers: counterintuitive behaviour of nectar-collecting bumble bees achieves an ideal free distribution. Functional Ecology 16(4): 492-503.
23. Ohashi, K. and T. Yahara (2000) Effects of flower production and pre-dispersal seed predation on reproduction in Cirsium purpuratum. Canadian Journal of Botany 78(2): 230-236.
24. Ohashi, K. and T. Yahara (1999) How long to stay on, and how often to visit a flowering plant? - a model for foraging strategy when floral displays vary in size. Oikos 86(2): 386-392.
25. Ohashi, K. and T. Yahara (1998) Effects of variation in flower number on pollinator visits in Cirsium purpuratum (Asteraceae). American Journal of Botany 85(2): 219-224.

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Everyone has the same chance.

In that sense, it makes it really worthwhile,

because no one can take it away from you.


— Bernd Heinrich