在线查找
与期刊/刊物的链接
在图书馆查找
正在查找有这资料的图书馆...
详细书目
| 文件类型: | 文章 |
|---|---|
| 所有的著者/提供者: | Petri Nummi; Hannu Pöysä |
| ISSN: | 0906-7590 |
| OCLC号码: | 480105279 |
| 语言注释: | English |
| 奖励: |
摘要:
We studied the response of a guild of three Anas-species to patch disturbance caused by the beaver Castor canadensis in southern Finland during 1988-1996. Of the three species, the teal Anas crecca increased in beaver ponds during the first two years of beaver occupation compared to the situation before the beaver. The mallard Anas platyrhynchos and wigeon Anas penelope did not respond to beaver flooding during the first two years. Also dominance relations changed upon inundation. The mallard usually was more numerous than the teal before the beaver, but the reverse was the case during beaver occupation. The study shows that some animal guilds may benefit from disturbance although species dominance relations may change. And, that this change in dominance can be caused by an ecosystem engineer, the beaver.
