Date: Nov 29th,2019
Venue： Conference Room 201
Speaker： Prof. Tomohiro Sasanami
Department of Applied Life Sciences, Faculty of Agriculture, Shizuoka University
Title：Female mating preference in bird: more masculine guys are popular for females after all!
Abstract: Biased mating due to female preferences toward certain traits in males is a major mechanism driving sexual selection in diverse taxa. It may work as key evolutionary forces in animals with sexual reproduction. What is the attractiveness of guys? In mankind, kindness heart, money and social status…etc are important, however, in animal kingdom, the masculine guys are more attractive for female! In birds, although the significance of male ornaments, plumage coloration, genetic dissimilarity as well as body size for female mating preference had been reported, little, if any work, had addressed the underlying mechanisms. In this seminar, I ‘d like to introduce my recent findings in bird that the trait expressed in androgen-dependent manner is truly important for the attraction for female in polygamous female birds, Japanese quail. A significant correlation between female mating preference and circulating testosterone (T) in the male was observed. Castration or short-day treatment of male spoiled his attractiveness. The cheek feather of attractive males contains higher melanin and exhibits more brilliant feather color. The ability of female to distinguish the attractive males from others was disappeared when the light source was covered with the sharp cut filter (cutoff; <640 nm), indicating that female eyesight is of critical importance for mating preference. When the females were maintained in short-day regimen (SD), they become insensitive to the male attractiveness. The expression level of retinal red-sensitive opsin in female dramatically dropped under SD conditions. These results demonstrate that in quail, female mating preferences are highly stimulated by coordinate increase of male attractiveness caused by androgen and female visual sensitivity for male attractiveness, which occurs simultaneously during breeding season.
Selected Publication list:
Ito, T. et al. Endocrinology, 152 (10): 3952-3962. (2011).
Sasanami, T. et al. Reproduction, 144 (4): 423-431. (2012).
Hiyama, G. et al. Reproduction,, 147 (2): 167-178. (2013).
Mizushima, S. et al. Development, 141(19): 3799-3806. (2014).
Sasanami, T. et al. Scientific Reports, 5: 7700 (2015).
Matsuzaki, M. et al. Scientific Reports, 5: 17643 (2015).
Ichikawa, Y. et al. Journal of Poultry Science, 53 (3): 173-180. (2016).
Matsuzaki, M. and Sasanami, T. Eds., Springer, pp173-186. (2017).
Ishii, A. et al. Scientific Reports, 8: 2644. (2018).
Hiyama, G. et al. Scientific Reports, 8: 10012. (2018).
The seminar will be delivered in English.