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Risk sensitivity of a forager with limited energy reserves in stochastic environments
http://hdl.handle.net/10069/38817
http://hdl.handle.net/10069/388175e53e38c-c0e1-427b-960a-f59646f81606
名前 / ファイル | ライセンス | アクション |
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EcoRes34_9.pdf (1.9 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-02-15 | |||||
タイトル | ||||||
タイトル | Risk sensitivity of a forager with limited energy reserves in stochastic environments | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | adaptive behavior | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | foraging theory | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | geometric mean fitness | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | mathematical modeling | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | optimal behavior | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Ito, Hiromu
× Ito, Hiromu |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Long-term environmental stochasticity is known to affect the adaptive evolution of life history traits. In stochastic environments, there are two different levels of behavioral optimization, as follows: Level 1, the optimal strategy under an intrageneration stochastic environment and Level 2, the optimal strategy under an intergeneration stochastic environment. This article presents a simple optimal foraging model under predation risks and verified the effect of behavioral optimization on the foraging time ratio. In this model, foragers are exposed to predation risks during foraging but are safe if they stay in their nests without any food. The foraging time allocation strategies that optimize the geometric mean fitness (Level 2) were compared with the arithmetic mean fitness (Level 1) to verify the effects of intergenerational stochasticity,whereby there is an alternation in good/bad environments across generations. As in previous studies, risk-averse strategies (a shorter foraging time is adopted for Level 2 than for Level 1) were commonly observed using this model. Unexpectedly, the model showed a tendency toward a preference for risk-prone strategies. This qualitative difference became prominent when food was abundant and the maximum energy reserves were small. Theoretical studies have shown that risk-averse strategies are commonly adopted during food shortages and result in starvation. However, the current results indicate that risk-prone strategies may become optimal under a limited reserve capacity. Thus, the optimal strategy depends not only on the individual status and environmental conditions, but also on the detailed selection regimes. |
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書誌情報 |
Ecological Research 巻 34, 号 1, p. 9-17, 発行日 2019-01-30 |
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出版者 | ||||||
出版者 | John Wiley & Sons Australia, Ltd | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 09123814 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1111/1440-1703.1058 | |||||
権利 | ||||||
権利情報 | c 2019 The Authors. Ecological Research published by John Wiley & Sons Australia, Ltd on behalf of The Ecological Society of Japan. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Ecological Research, 34(1), pp.9-17; 2019 |