檔案:PNAS cover.gif
PNAS_cover.gif （200 × 268 像素，檔案大小：35 KB，MIME 類型：image/gif）
摘要
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
授權協議
| 描述 | Cover of PNAS issue 112/1. |
|---|---|
| 來源 | Image courtesy of Krieger Conradt. |
| 條目 | Proceedings of the National Academy of Sciences |
| 有限使用 | Cover image only. |
| 低解析度 | Yes |
| 用途 | The image serves as the primary means of visual identification of PNAS volume 112. |
| 無等效品 | The image cannot be replaced by a free image. |
| 其他資訊 | |
| Fair use合理使用Proceedings of the National Academy of Sciences上下文中受版權保護的材料//zh.wikipedia.org/wiki/File:PNAS_cover.gif | |
 | 本圖是一本雜誌的封面，受到版權保護。版權極可能屬於製作本雜誌的雜誌社、或提供圖文的人士。有鑑及本圖：
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注意：雜誌封面中出現的人或物等的圖像不允許在該人或物等的條目中作為插圖。除非這個圖像的出版與該人或物等有直接關係；否則，不當的使用將被移除。 | |
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| 日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
|---|---|---|---|---|---|
| 目前 | 2015年5月1日 (五) 02:32 | | 200 × 268（35 KB） | Koala0090（留言 | 貢獻） | {{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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