Fine-scale changes in speed and altitude suggest protean movements in homing pigeon flights

Research output: Contribution to journalArticle

Abstract

The power curve provides a basis for predicting adjustments that animals make in flight speed, for example in relation to wind, distance, habitat foraging quality and objective. However, relatively few studies have examined how animals respond to the landscape below them, which could affect speed and power allocation through modifications in climb rate and perceived predation risk. We equipped homing pigeons (Columba livia) with high-frequency loggers to examine how flight speed, and hence effort, varies in relation to topography and land cover. Pigeons showed mixed evidence for an energy-saving strategy, as they minimized climb rates by starting their ascent ahead of hills, but selected rapid speeds in their ascents. Birds did not modify their speed substantially in relation to land cover, but used higher speeds during descending flight, highlighting the importance of considering the rate of change in altitude before estimating power use from speed. Finally, we document an unexpected variability in speed and altitude over fine scales; a source of substantial energetic inefficiency. We suggest this may be a form of protean behaviour adopted to reduce predation risk when flocking is not an option, and that such a strategy could be widespread.

Details

Authors
  • Baptiste Garde
  • Rory P. Wilson
  • Emmanouil Lempidakis
  • Luca Börger
  • Steven J. Portugal
  • Anders Hedenström
  • Giacomo Dell'Omo
  • Michael Quetting
  • Martin Wikelski
  • Emily L.C. Shepard
Organisations
External organisations
  • Swansea University
  • Royal Holloway University of London
  • University of Konstanz
  • Max-Planck Institute of Animal Behavior
  • Ornis Italica
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Behavioral Sciences Biology

Keywords

  • flight speed, flocking, landscape, pigeon, predation risk, protean behaviour
Original languageEnglish
Article number210130
JournalRoyal Society Open Science
Volume8
Issue number5
Publication statusPublished - 2021 May 1
Publication categoryResearch
Peer-reviewedYes