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The Borders and Beyond

Arctic, Cheviot, Tropic

Author: Abel Chapman

Publisher:

ISBN:

Category: Birds

Page: 489

View: 738

Bird Migration

Physiology and Ecophysiology

Author: Eberhard Gwinner

Publisher: Springer Science & Business Media

ISBN:

Category: Science

Page: 435

View: 684

E. GWINNER! The phenomenon of bird migration with its large scale dimensions has attracted the attention of naturalists for centuries. Worldwide billions of birds leave their breeding grounds every autumn to migrate to areas with seasonally more favor able conditions. Many of these migrants travel only over a few hundred kilo meters but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion birds that invade Africa every autumn from their West and Central Palaearctic breeding areas. In the Americas and in Asia the scope of bird migration is of a similar magnitude. Just as impressive as the numbers of birds are their achievements. They have to cope with the enormous energetic costs of long-distance flying. particularly while crossing oceans and deserts that do not allow replenishment of depleted fat reserves. They have to appropriately time the onset and end of migrations. both on a daily and annual basis. And finally. they have to orient their migratory movements in space to reach their species- or population-specific wintering and breeding grounds, irrespective of the variable climatic conditions along their migratory routes.

Experiment Station Record

Author: United States. Office of Experiment Stations

Publisher:

ISBN:

Category: Agricultural experiment stations

Page:

View: 629

The Auk

Author:

Publisher:

ISBN:

Category: Birds

Page:

View: 213

Savage Sudan

Its Wild Tribes, Big-game and Bird-life

Author: Abel Chapman

Publisher:

ISBN:

Category: Hunting

Page: 452

View: 190

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