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Flight speeds among bird species: allometric and phylogenetic effects

  • Thomas Alerstam
  • Mikael Rosén
  • Johan Bäckman
  • Pär Ericson
  • Olof Hellgren
Publishing year: 2007
Language: English
Pages: 1656-1662
Publication/Series: PLoS Biology
Volume: 5
Issue: 8
Document type: Journal article
Publisher: Public Library of Science

Abstract english

Analysing the variation in flight speed among bird species is important in understanding flight. We tested if the cruising speed of different migrating bird species in flapping flight scales with body mass and wing loading according to predictions from aerodynamic theory and to what extent phylogeny provides an additional explanation for variation in speed. Flight speeds were measured by tracking radar for bird species ranging in size from 0.01 kg (small passerines) to 10 kg (swans). Equivalent airspeeds of 138 species ranged between 8 and 23 m/s and did not scale as steeply in relation to mass and wing loading as predicted. This suggests that there are evolutionary restrictions to the range of flight speeds that birds obtain, which counteract too slow and too fast speeds among bird species with low and high wing loading, respectively. In addition to the effects of body size and wing morphology on flight speed, we also show that phylogeny accounted for an important part of the remaining speed variation between species. Differences in flight apparatus and behaviour among species of different evolutionary origin, and with different ecology and flight styles, are likely to influence cruising flight performance in important ways.


  • Biological Sciences


  • ISSN: 1544-9173
Thomas Alerstam
E-mail: thomas [dot] alerstam [at] biol [dot] lu [dot] se

Professor emeritus

Evolutionary ecology

+46 46 222 37 85


Sölvegatan 37, Lund