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Turbulence causes kinematic and behavioural adjustments in a flapping flier

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2024

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Lempidakis, Emmanouil
Ross, Andrew N.
Krishnan, Krishnamoorthy
Garde, Baptiste
Shepard, Emily

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European Union (EU): 715874

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Interface : Journal of the Royal Society. Royal Society of London. 2024, 21(212), 20230591. ISSN 1742-5689. eISSN 1742-5662. Verfügbar unter: doi: 10.1098/rsif.2023.0591

Zusammenfassung

Turbulence is a widespread phenomenon in the natural world, but its influence on flapping fliers remains little studied. We assessed how freestream turbulence affected the kinematics, flight effort and track properties of homing pigeons (Columba livia), using the fine-scale variations in flight height as a proxy for turbulence levels. Birds showed a small increase in their wingbeat amplitude with increasing turbulence (similar to laboratory studies), but this was accompanied by a reduction in mean wingbeat frequency, such that their flapping wing speed remained the same. Mean kinematic responses to turbulence may therefore enable birds to increase their stability without a reduction in propulsive efficiency. Nonetheless, the most marked response to turbulence was an increase in the variability of wingbeat frequency and amplitude. These stroke-to-stroke changes in kinematics provide instantaneous compensation for turbulence. They will also increase flight costs. Yet pigeons only made small adjustments to their flight altitude, likely resulting in little change in exposure to strong convective turbulence. Responses to turbulence were therefore distinct from responses to wind, with the costs of high turbulence being levied through an increase in the variability of their kinematics and airspeed. This highlights the value of investigating the variability in flight parameters in free-living animals.

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570 Biowissenschaften, Biologie

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ISO 690LEMPIDAKIS, Emmanouil, Andrew N. ROSS, Krishnamoorthy KRISHNAN, Baptiste GARDE, Martin WIKELSKI, Emily SHEPARD, 2024. Turbulence causes kinematic and behavioural adjustments in a flapping flier. In: Interface : Journal of the Royal Society. Royal Society of London. 2024, 21(212), 20230591. ISSN 1742-5689. eISSN 1742-5662. Verfügbar unter: doi: 10.1098/rsif.2023.0591
BibTex
@article{Lempidakis2024-03Turbu-69694,
  year={2024},
  doi={10.1098/rsif.2023.0591},
  title={Turbulence causes kinematic and behavioural adjustments in a flapping flier},
  number={212},
  volume={21},
  issn={1742-5689},
  journal={Interface : Journal of the Royal Society},
  author={Lempidakis, Emmanouil and Ross, Andrew N. and Krishnan, Krishnamoorthy and Garde, Baptiste and Wikelski, Martin and Shepard, Emily},
  note={Article Number: 20230591}
}
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