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Differences in Speed and Duration of Bird Migration between Spring and Autumn.

In English

Författare

Summary, in English

Abstract It has been suggested that birds migrate faster in spring than in autumn because of competition for arrival order at breeding grounds and environmental factors such as increased daylight. Investigating spring and autumn migration performances is important for understanding ecological and evolutionary constraints in the timing and speed of migration. We compiled measurements from tracking studies and found a consistent predominance of cases showing higher speeds and shorter durations during spring compared to autumn, in terms of flight speeds (airspeed, ground speed, daily travel speed), stopover duration, and total speed and duration of migration. Seasonal differences in flight speeds were generally smaller than those in stopover durations and total speed/duration of migration, indicating that rates of foraging and fuel deposition were more important than flight speed in accounting for differences in overall migration performance. Still, the seasonal differences in flight speeds provide important support for time selection in spring migration.

Publiceringsår

2013

Språk

Engelska

Sidor

837-845

Publikation/Tidskrift/Serie

American Naturalist

Volym

181

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

University of Chicago Press

Ämne

  • Biological Sciences

Nyckelord

  • bird migration speed
  • duration of migration
  • flight speed
  • stopover
  • optimal migration
  • timing of migration

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0003-0147