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: | E L P Anthony; M H Stack; T H Kunz |
| ISSN: | 0029-8549 |
| OCLC号码: | 481696973 |
| 语言注释: | English |
| 注意: | Fig. 4. Relationships of bat activity, prey density, and environmental conditions in June and July, 1976, as revealed by partial correlation analysis. Arrows represent statistically significant correlations, but do not necessarily imply direct causality. Insect density refers only to size classes eaten by M. lucifugus |
| 奖励: |
摘要:
The insectivorous bat Myotis lucifugus typically apportions the night into two foraging periods separated by an interval of night roosting. During this interval, many bats occupy roosts that are used exclusively at night and are spatially separate from maternity roosts. The proportion of the night which bats spend roosting, and thus the proportion spent foraging, vary both daily and seasonally in relation to the reproductive condition of the bats, prey density, and ambient temperature. A single, continuous night roosting period is observed during pregnancy. During lactation, females return to maternity roosts between foraging bouts, and night roosts are used only briefly and sporadically. Maximum use of night roosts occurs in late summer after young become volant. Superimposed upon these seasonal trends is day-to-day variation in the bats' nightly time budget. Long night roosting periods and short foraging periods are associated with cool nights and low prey density. This behavioral response may minimize energetic losses during periods of food scarcity.
