文件:PNAS cover.gif
PNAS_cover.gif （200 × 268像素，文件大小：35 KB，MIME类型：image/gif）
摘要
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Pictured is the aftermath of a snowstorm in the Sonoran Desert. Extreme weather events may become common as a consequence of climate change, challenging organisms' abilities to adapt. Carlos A. Botero et al. modeled various evolutionary adaptation strategies that organisms may employ to protect themselves from thermal stress. The results suggest that although populations can often cope with large changes in environmental conditions, occasionally climate conditions may exceed organisms' ability to adapt and reach an evolutionary tipping point, beyond which the population may collapse. According to the authors, the results also suggest a theoretical framework to explore how variability in environmental conditions may affect the viability of natural populations. See the article by Botero et al. on pages 184-189. Image by Krieger Conradt (photographer).
http://www.pnas.org/content/112/1.cover-expansion
授权协议
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| 描述 | Cover of PNAS issue 112/1. |
|---|---|
| 来源 | Image courtesy of Krieger Conradt. |
| 条目 | Proceedings of the National Academy of Sciences |
| 有限使用 | Cover image only. |
| 低分辨率 | Yes |
| 用途 | The image serves as the primary means of visual identification of PNAS volume 112. |
| 无等效品 | The image cannot be replaced by a free image. |
| 其他信息 | |
| Fair use合理使用Proceedings of the National Academy of Sciences上下文中受版权保护的材料//zh.wikipedia.org/wiki/File:PNAS_cover.gif | |
 | 本图是一本杂志的封面，受到版权保护。版权极可能属于制作本杂志的杂志社、或提供图文的人士。有鉴及本图：
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| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2015年5月1日 (五) 02:32 | | 200 × 268（35 KB） | Koala0090（留言 | 贡献） | {{Non-free use rationale | Article = Proceedings of the National Academy of Sciences | Description = Cover of PNAS issue 112/1. | Source = Image courtesy of Krieger Conradt. | Portion = Cover image only. | Low r... |
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