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The Avian MigrantThe Biology of Bird Migration$
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John Rappole

Print publication date: 2013

Print ISBN-13: 9780231146784

Published to Columbia Scholarship Online: November 2015

DOI: 10.7312/columbia/9780231146784.001.0001

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Fall Transient Period

Fall Transient Period

(p.91) Chapter 4 Fall Transient Period
The Avian Migrant

John H. Rappole

Columbia University Press

This chapter focuses on the fall transient period in the avian migrant's annual cycle. The fall transient period begins with the end of the postbreeding period as migratory birds depart on fall migration. From an evolutionary perspective, this is the most critical portion of the annual cycle because it is difficult to understand how this first migrant gets back to its natal area after successful completion of breeding, and even more formidable to comprehend how its offspring complete such a journey. The chapter first considers the physiologic and associated behavioral changes that a migrant undergoes in preparation for, and during, its migratory journey. It then examines the environmental cues in control over the evolved physiologic and behavioral responses of migrants, the timing of departure within the fall transient period, and the timing of departure within the circadian period. It also discusses the bird's migratory flight and migration route, orientation and navigation, and stopover.

Keywords:   fall transient period, migratory birds, fall migration, behavioral changes, departure, circadian period, migratory flight, migration route, navigation, stopover

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