USFWS Circular 16: Migration of Birds (1950)
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Language
English
ISBN
Unknown
MIGRATION of BIRDS
Contents
MIGRATION of BIRDS
The Mystery of Migration
Advantages of Migration
The Origin of Migration
Northern ancestral home theory
Southern ancestral home theory
Theory of photoperiodism
Theory of continental drift
When Birds Migrate
Movements of species and groups
Nocturnal and diurnal migration
How Birds Migrate
Speed of flight and speed of migration
Altitude at which birds travel
Orientation
Segregation during migration
Where Birds Migrate
Short and undetermined migrations
Variable migrations within species
Fall flights not far south of breeding ranges
Long-distance migrations
Routes of Migration
Wide and narrow migration lanes
The flyways
Atlantic oceanic route
Atlantic coast route and tributaries
Mackenzie Valley—Great Lakes—Mississippi Valley route and tributaries
Great Plains—Rocky Mountain routes
Pacific coast route
Pacific oceanic route
Arctic routes
Evolution of Migration Routes
Vertical Migration
Vagrant Migration
Perils of Migration
Storms
Aerial obstructions
Exhaustion
Influence of the Weather on Migration
Problems of Migration
Banding studies
Movements of residents
Migration of the white-throated sparrow
Migration of the yellow-billed loon
Conclusions
Appendix I—List of Birds Mentioned in the Text
Appendix II—Bird Banding
Bibliography
Index
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