GEOGRAPHY AND THE PROPERTIES OF SURFACES. MINIMUM TIME PATHS AND THE MIGRATION OF THE ARCTIC TERN.
Abstract
In the realm of migrating birds, the Arctic tern is formidable. Members of one species may travel at least 22,000 miles each year. Actual migratory paths are not fully known, but bandings and sightings suggest circuitous paths between origin and ultimate destination. The paths clearly are not least-distance paths. This paper explores some ideas associated with the notion that a least-time path with other constraints based on resting and feeding places produces a composite of least-time paths. In this exploratory paper the idea, of course, can not be fully validated. The evidence shows, however, that neither can it be totally rejected. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 07, 1969
- Accession Number
- AD0688454
Entities
People
- Robert C. Eckhardt
Organizations
- Harvard University