排序方式: 共有1条查询结果,搜索用时 15 毫秒
1
1.
Donald C. Dearborn 《Behavioral ecology and sociobiology》1998,43(4-5):259-270
Understanding the selective forces that limit the exaggeration of begging signals is a critical issue in understanding the
evolution of begging behavior. I studied the begging behavior of nestlings of the brown-headed cowbird (Molothrus ater), a brood parasite. In the nests of indigo buntings (Passerina cyanea), brown-headed cowbird nestlings received approximately twice as much food per hour than their host nestmates. I tested three
hypotheses for the mechanism by which cowbirds acquired more food than their bunting nestmates: the size advantage hypothesis,
the signal exaggeration hypothesis, and the novel begging behavior hypothesis. I found support for the hypotheses that cowbirds
acquire more food as a result of their larger body size, and due to the exaggeration of begging signals that are not dependent
on body size. I did not find support for the role of novel begging behaviors in cowbird food acquisition. These results suggest
that food acquisition by host chicks in unparasitized nests could be increased by the exaggeration of begging signals. Recent
work suggests that such exaggeration may be limited by the risk of nest predation, but further studies are needed.
Received: 12 December 1997 / Accepted after revision: 29 December 1997 相似文献
1