Decision-making by a soaring bird : time, energy and risk considerations at different spatio-temporal scales

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2016
Autor:innen
Duriez, Olivier
Spiegel, Orr
Fluhr, Julie
Horvitz, Nir
Getz, Wayne M.
Bouten, Willem
Sarrazin, François
Hatzofe, Ohad
Nathan, Ran
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Philosophical transactions of the Royal Society of London , Series B: Biological Sciences. Royal Society of London. 2016, 371(1704), 20150397. ISSN 0080-4622. eISSN 1471-2970. Available under: doi: 10.1098/rstb.2015.0397
Zusammenfassung

Natural selection theory suggests that mobile animals trade off time, energy and risk costs with food, safety and other pay-offs obtained by movement. We examined how birds make movement decisions by integrating aspects of flight biomechanics, movement ecology and behaviour in a hierarchical framework investigating flight track variation across several spatio-temporal scales. Using extensive global positioning system and accelerometer data from Eurasian griffon vultures (Gyps fulvus) in Israel and France, we examined soaring-gliding decision-making by comparing inbound versus outbound flights (to or from a central roost, respectively), and these (and other) home-range foraging movements (up to 300 km) versus long-range movements (longer than 300 km). We found that long-range movements and inbound flights have similar features compared with their counterparts: individuals reduced journey time by performing more efficient soaring-gliding flight, reduced energy expenditure by flapping less and were more risk-prone by gliding more steeply between thermals. Age, breeding status, wind conditions and flight altitude (but not sex) affected time and energy prioritization during flights. We therefore suggest that individuals facing time, energy and risk trade-offs during movements make similar decisions across a broad range of ecological contexts and spatial scales, presumably owing to similarity in the uncertainty about movement outcomes.This article is part of the themed issue 'Moving in a moving medium: new perspectives on flight'.

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570 Biowissenschaften, Biologie
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soaring–gliding efficiency, convective thermals, movement ecology, GPS tracking, biotelemetry, risk-aversion flight index
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ISO 690HAREL, Roi, Olivier DURIEZ, Orr SPIEGEL, Julie FLUHR, Nir HORVITZ, Wayne M. GETZ, Willem BOUTEN, François SARRAZIN, Ohad HATZOFE, Ran NATHAN, 2016. Decision-making by a soaring bird : time, energy and risk considerations at different spatio-temporal scales. In: Philosophical transactions of the Royal Society of London , Series B: Biological Sciences. Royal Society of London. 2016, 371(1704), 20150397. ISSN 0080-4622. eISSN 1471-2970. Available under: doi: 10.1098/rstb.2015.0397
BibTex
@article{Harel2016Decis-51714,
  year={2016},
  doi={10.1098/rstb.2015.0397},
  title={Decision-making by a soaring bird : time, energy and risk considerations at different spatio-temporal scales},
  number={1704},
  volume={371},
  issn={0080-4622},
  journal={Philosophical transactions of the Royal Society of London , Series B: Biological Sciences},
  author={Harel, Roi and Duriez, Olivier and Spiegel, Orr and Fluhr, Julie and Horvitz, Nir and Getz, Wayne M. and Bouten, Willem and Sarrazin, François and Hatzofe, Ohad and Nathan, Ran},
  note={Article Number: 20150397}
}
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