Mathematical Biology Laboratory Department of Biology, Kyushu University

Yuki Kubo

NAME

Yuki Kubo

Email: yukikubo[at]kyudai.jp
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Personal website: yukikubo.com

CURRENT POSITION

Ph.D. candidate, Graduate School of Systems Life Sciences, Kyushu University
Japan Society for the Promotion of Science for Young Scientists, DC1

EDUCATION

  • B.S. Kyushu University, Japan, 2013 (Biology)
  • M.S. Kyushu University, Japan, 2015 (Mathematical Biology)

RESEARCH INTERESTS

[1] Animal Collective Behaviour
[2] Plantation management in tropical forests, especially Indonesia
[3] Decision making process

PUBLICATIONS

[1] Y. Kubo, and Y. Iwasa. Phase diagram of a multiple forces model for animal group formation: marches versus circles determined by the relative strength of alignment and cohesion. Population Ecology (2016).

Makoto Douge

NAME

Makoto douge

Email: makotodouge[at]gmail.com
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CURRENT POSITION

Ph.D. candidate, Graduate School of Systems Life Sciences, Kyushu University

EDUCATION

  • B.S. Hitotsubashi University, Japan, 1974 (Low)
  • M.S. The Open University of Japan, 2015 (Biology)

RESEARCH INTERESTS

I study the reason of sexual reproduction by computer simulation.

Kenji Yoshida

NAME

Kenji Yoshida

Email: false_saffron[at]yahoo.co.jp
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CURRENT POSITION

Ph.D. candidate, Graduate School of Systems Life Sciences, Kyushu University

EDUCATION

  • B.S. Kyushu University, Japan, 2013 (Biology)

Yusuke Kakizoe

NAME

Yusuke Kakizoe

Email: yusuke.purple5[at]gmail.com
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CURRENT POSITION

Ph.D. candidate, Graduate School of Systems Life Sciences, Kyushu University
Japan Society for the Promotion of Science for Young Scientists, DC1

EDUCATION

  • B.S. Kyushu University, Japan, 2014 (Biology)
  • M.S. Kyushu University, Japan, 2016 (Mathematical Biology)

Shinsuke Satoi

NAME

Shinsuke Satoi

Email: ssatoi257n[at]gmail.com
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CURRENT POSITION

Ph.D. candidate, Graduate School of Systems Life Sciences, Kyushu University
Japan Society for the Promotion of Science for Young Scientists, DC1

EDUCATION

  • B.S. Kyushu University, Japan, 2014 (Biology)
  • M.S. Kyushu University, Japan, 2016 (Mathematical Biology)

RESEARCH INTERESTS

Leuckart’s Law states that among vertebrates, swifter animals should have larger eyes. A positive correlation between movement speed and eye size is a plausible hypothesis because faster-moving animals need to have a higher level of visual acuity to recognize food items and obstacles while they are still far away and because the ability of eyes to resolve images is known to increase with their size. A small number of empirical studies suggest that Leuckart’s Law is supported for mammals but rejected for birds. To better understand the conditions under which Leuckart’s Law holds, we conducted computer simulations of an animal moving on a plane that contains many food items as well as obstacles. The animal moves at a constant speed but changes its directional angle when it recognizes food items or obstacles. We examined the number of food items the animal consumed and the number of obstacles it collided with. Given a small cost of visual acuity, we obtained the optimal visual acuity, which depended on several parameters such as visible distance, visible angle, turning ability, movement speed, and densities of foods and obstacles in the field. Assuming that the animal’s visual acuity is close to the optimal value predicted by the model, Leuckart’s Law mostly holds when animals are in an environment with similar densities of food items and obstacles. The positive correlation between movement speed and visual distance was stronger with more obstacles and fewer food items. However, Leuckart’s Law may not hold if food is abundant, obstacles are rare, and collision damage is small.

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