京都大学 · 心理学
Hashimoto教授の研究室は、霊長類の行動・生態とその環境要因の関係を、統計的解析と行動観察を融合して解明する研究を展開しています。特に、ウガンダのカリンズ森林における植生の多様性とチンパンジーの声の行動の関連を、主成分分析を用いて環境要因と人為的影響の指標として解明しています。また、ボノボの低オス比（OSR）とその社会的行動の特徴についても、繁殖行動のメカニズムに着目した研究を進めています。
Figures are computed from collected data and may differ slightly.
We analysed the vegetation of the Kalinzu Forest, Uganda, using principal component analysis. We got two components by the analysis: one seemed to indicate the strength of environmental factors characteristic to the western part of the study area, and the other seemed to indicate the extent of disturbance by human exploitation. Using these components, we made a vegetation map that distinguished four types of vegetation: mixed mature forest, Parinari-dominated mature forest, Parinari-dominated se
The operational sex ratio (OSR) is used as a predictor for the intensity of mating competition. While many factors affect the OSR, there tends to be a high male bias in primate species with long interbirth intervals and non-seasonal breeding, such as hominid apes. However, the OSR of bonobos (Pan paniscus) is lower than that of chimpanzees (Pan troglodytes), which is thought to reduce competitive and aggressive male behaviors. The low OSR of bonobos is considered to result from the early resumpt
Parsing signals from noise is a general problem for signallers and recipients, and for researchers studying communicative systems. Substantial efforts have been invested in comparing how other species encode information and meaning, and how signalling is structured. However, research depends on identifying and discriminating signals that represent meaningful units of analysis. Early approaches to defining signal repertoires applied top-down approaches, classifying cases into predefined signal ty
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