Testing a game model on the stable polymorphism of colour vision in callitrichid species

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K16242
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 45050:Physical anthropology-related
• Research Institution: Kyushu University
• Principal Investigator: Seki Motohide 九州大学, 芸術工学研究院, 助教 (30647409)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 数理モデル / ゲーム理論 / 性的二型 / 同性内多型 / 性染色体

Outline of Final Research Achievements

Intersexual difference and same-sex individual difference are maintained in New World macaque colour vision and in grasshopper antipredatory signalling behaviour. We examined the validity of our hypotheses on mechanisms maintaining these diversities using mathematical models. In New World monkeys, the model was analysed under the assumption that individuals that can originally distinguish red from green have an advantage in foraging, but that individuals that do not distinguish red from green will eventually be able to forage to the same extent through situational learning, and results were consistent with field data. In the grasshopper, we showed that signalling and non-signalling individuals can coexist if the signal has the effect of reducing the predation rate of not only the sender's own predation rate, but also that of neighbouring individuals.

Free Research Field

数理生物学

Academic Significance and Societal Importance of the Research Achievements

新世界ザル色覚多型は従来、超優性によって保たれているという説が支配的であったが、実証研究から赤と緑を区別できる個体と区別しない個体の間に採餌成績の差がないことが示唆された。今回の数理モデル研究では、赤と緑を区別しない個体が後天的学習によって赤と緑を区別できる個体と同程度の採餌ができるようになる場合でも、学習効率が集団の各タイプの頻度に依存する場合は多様性が維持されうることがわかった点に学術的意義がある。