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arXiv 2407.02571astro-ph.EP
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系外行星的适应性宜居性:在极端环境变化中繁衍

Adaptive Habitability of Exoplanets: Thriving Under Extreme Environmental Change

Itay Weintraub, Hagai B. Perets

AI总结:

提出生态—演化模型模拟多生态位、迁移与温度波动,揭示生命在渐进和突变环境下的适应性宜居阈值。

摘要:

生命在多样且不断变化的行星环境中繁衍的动态特性表明,宜居性和生存取决于演化路径以及生命对环境条件的适应。本文通过天体生态模型探索这种“适应性宜居性”。我们研究温度适应与环境波动之间的相互作用,尤其是由太阳活动和轨道动力学引发的波动。我们提出一个简化的生态—演化模型,以考察行星尺度上生命适应能力的极限。通过纳入多重生态位、迁移、物种相互作用和真实温度变化等复杂因素,我们证明了在渐进式和突发式环境变化面前适应性宜居性的潜力。通过涵盖单调、周期性以及长期动力学演化诱发的温度剖面的模拟,我们确定了生存与灭绝的临界阈值,强调了表型方差和扩散速率在适应变化环境条件中的重要性。这些发现凸显了在评估系外行星宜居性时考虑时间变化、并扩大潜在宜居世界搜索空间的重要意义。

英文摘要:

The dynamic nature of life's ability to thrive in diverse and changing planetary environments suggests that habitability and survival depend on the evolutionary path and life adaptation to environmental conditions. Here we explore such "adaptive habitability" through astro-ecological models. We study the interplay between temperature adaptation and environmental fluctuations, particularly those induced by solar activity and orbital dynamics. We present a simplified ecological-evolutionary model to investigate the limits of life's adaptability on a planetary scale. By incorporating complexities such as multiple niches, migration, species interactions, and realistic temperature variations, we demonstrate the potential for adaptive habitability in the face of both gradual and abrupt environmental changes. Through simulations encompassing monotonic, periodic, and secular dynamical evolution-induced temperature profiles, we identify critical thresholds for survival and extinction, highlighting the importance of phenotypic variance and dispersal rates in adapting to varying environmental conditions. These findings underscore the significance of considering temporal variations in assessing exoplanet habitability and expanding the search space for potentially habitable worlds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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