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

Harel, R., Duriez, O., Spiegel, O., Fluhr, J., Horvitz, N., Getz, W. M., et al. (2016). Decision-making by a soaring bird: time, energy and risk considerations at different spatio-temporal scales. Philosophical Transactions of the Royal Society B-Biological Sciences, 371(1704): 20150397. doi:10.1098/rstb.2015.0397.

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Harel, Roi1, Author              
Duriez, O., Author
Spiegel, O., Author
Fluhr, J., Author
Horvitz, N., Author
Getz, W. M., Author
Bouten, W., Author
Sarrazin, F., Author
Hatzofe, O., Author
Nathan, R., Author
Affiliations:
1The Hebrew University of Jerusalem, ou_persistent22              

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 Abstract: 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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 Dates: 2016-09-26
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: WOS:000383111900015
DOI: 10.1098/rstb.2015.0397
ISSN: 0962-8436
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Title: Philosophical Transactions of the Royal Society B-Biological Sciences
Source Genre: Journal
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Pages: - Volume / Issue: 371 (1704) Sequence Number: 20150397 Start / End Page: - Identifier: -