| 文件类型： |
文章 |
| 所有的著者/提供者： |
Robert R Gorman; J Homer Ferguson |
| ISSN: | 0018-0831 |
|---|
| OCLC号码： |
485195952 |
| 语言注释： |
English |
| 注意： |
Fig. 5.-Map of Spring Valley Reservoir showing point of release and points of recapture of toads used in long distance homing experiment. |
| 奖励： |
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摘要：
The mechanisms that govern orientation in Bufo boreas were studied in the spring and summer of 1967. Toads were collected adjacent to the shores of several lakes in the vicinity of Moscow, Idaho. The compass direction of a line drawn perpendicular to the shoreline was recorded at the site of each collection. The toads were transported to the laboratory in closed containers and released in the center of a circular test pool. Their direction of movement was compared with the compass reading taken at the site of collection. The data from these tests indicate that B. boreas has a mechanism of orientation based on a sun-compass. There was no indication that either stellar or lunar cues are used by this species. The ability to use this system of orientation develops after metamorphosis. In order to use the sun as a compass, the animal must possess a "biological clock." Our data indicate that this clock is based upon the photoperiod. Experiments in the field demonstrated that B. boreas is capable of homing to a particular breeding site. Only toads with normal vision homed successfully.
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文章 : 英语