期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
春之韵
1
作者 史鸣 《党员干部之友》 2012年第3期56-56,共1页
"常记得那个美妙的瞬间,你翩然出现在我的眼前。仿佛倏忽即逝的幻影,仿佛美丽圣洁的天仙"。春天在不经意间,悄悄地走来了,犹如一位美妙的少女,带着美好,带着梦幻,带着青春的活力,就这样翩翩而来。
关键词 《春之韵》 散文 文学 史鸣
原文传递
Behavioral conditions: and life history responses to extreme climatic Studies on a migratory songbird 被引量:1
2
作者 A. R Moller 《Current Zoology》 SCIE CAS CSCD 北大核心 2011年第3期351-362,共12页
Behavioral responses to environmental change are the mechanisms that allow for rapid phenotypic change preventing temporary or permanent damage and hence preventing reductions in fitness. Extreme climatic events are b... Behavioral responses to environmental change are the mechanisms that allow for rapid phenotypic change preventing temporary or permanent damage and hence preventing reductions in fitness. Extreme climatic events are by definition rare, although they are predicted to increase in amplitude and frequency in the coming years. However, our current knowledge about behavioral responses to such extreme events is scarce. Here I analyze two examples of the effects of extreme weather events on behavior and life history: (1) A comparison of behavior and life history during extremely warm and extremely cold years relative to normal years; and (2) a comparison of behavior before and after the extremely early snowfall in fall 1974 when numerous birds died in the Alps during September-October. Behavioral and life history responses of barn swallows Hirundo rustica to extremely cold and extremely warm years were positively correlated, with particularly large effect sizes in cold years. Extreme mortality in barn swallows during fall migration 1974 in the Alps eliminated more than 40% of the breeding population across large areas in Central and Northern Europe, and this affected first arrival date, changes in timing and extent of reproduction and changes in degree of breeding sociality supposedly as a consequence of correlated responses to selection. Finally, I provide directions for research that will allow us to better understand behavior and life history changes in response to extreme climate change [Current Zoology 57 (3): 351-362, 2011]. 展开更多
关键词 Barn swallow Extreme climate Hard selection Hirundo rustica Laying date Second clutches SOCIALITY Truncationselection
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部