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Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds / Hannah J. Williams; Andrew J. King; Olivier Duriez; Luca Börger; Emily L. C. Shepard

Journal of The Royal Society Interface, Volume: 15, Issue: 148, Start page: 20180578

Swansea University Author: Borger, Luca

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DOI (Published version): 10.1098/rsif.2018.0578

Abstract

Vultures are thought to form networks in the sky, with individuals monitoring the movements of others to gain up-to-date information on resource availability. While it is recognized that social information facilitates the search for carrion, how this facilitates the search for updrafts, another crit...

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Published in: Journal of The Royal Society Interface
ISSN: 1742-5689 1742-5662
Published: Royal Society 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa48297
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spelling 2019-03-11T11:39:11Z v2 48297 2019-01-21 Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds Luca Borger Luca Borger true 0000-0001-8763-5997 false 8416d0ffc3cccdad6e6d67a455e7c4a2 be657dee57d87983ff5a094becb4144d KrNKIcwalNUkyxqMTsbkl9yvqZQRJmUl2lxhnzSZE7o= 2019-01-21 SBI Vultures are thought to form networks in the sky, with individuals monitoring the movements of others to gain up-to-date information on resource availability. While it is recognized that social information facilitates the search for carrion, how this facilitates the search for updrafts, another critical resource, remains unknown. In theory, birds could use information on updraft availability to modulate their flight speed, increasing their airspeed when informed on updraft location. In addition, the stylized circling behaviour associated with thermal soaring is likely to provide social cues on updraft availability for any bird operating in the surrounding area. We equipped five Gyps vultures with GPS and airspeed loggers to quantify the movements of birds flying in the same airspace. Birds that were socially informed on updraft availability immediately adopted higher airspeeds on entering the inter-thermal glide; a strategy that would be risky if birds were relying on personal information alone. This was embedded within a broader pattern of a reduction in airspeed (approx. 3 m s−1) through the glide, likely reflecting the need for low speed to sense and turn into the next thermal. Overall, this demonstrates (i) the complexity of factors affecting speed selection over fine temporal scales and (ii) that Gyps vultures respond to social information on the occurrence of energy in the aerial environment, which may reduce uncertainty in their movement decisions. Journal article Journal of The Royal Society Interface 15 148 20180578 Royal Society 1742-5689 1742-5662 flight, vulture, bird, biologging; soaring; behavioural ecology 0 11 2018 2018-11-01 10.1098/rsif.2018.0578 https://royalsocietypublishing.org/doi/full/10.1098/rsif.2018.0578 College of Science Biosciences CSCI SBI Swansea Lab for Animal Movement None 2019-03-11T11:39:11Z 2019-01-21T01:03:23Z College of Science Biosciences Hannah J. Williams 1 Andrew J. King 2 Olivier Duriez 3 Luca Börger 4 Emily L. C. Shepard 5 Under embargo Under embargo 2019-01-21T01:06:40Z Output 564435 application/pdf VoR true Updated Copyright 11/03/2019 2019-11-01T00:00:00 true eng
title Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
spellingShingle Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
Borger, Luca
title_short Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
title_full Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
title_fullStr Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
title_full_unstemmed Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
title_sort Social eavesdropping allows for a more risky gliding strategy by thermal-soaring birds
author_id_str_mv 8416d0ffc3cccdad6e6d67a455e7c4a2
author_id_fullname_str_mv 8416d0ffc3cccdad6e6d67a455e7c4a2_***_Borger, Luca
author Borger, Luca
author2 Hannah J. Williams
Andrew J. King
Olivier Duriez
Luca Börger
Emily L. C. Shepard
format Journal article
container_title Journal of The Royal Society Interface
container_volume 15
container_issue 148
container_start_page 20180578
publishDate 2018
institution Swansea University
issn 1742-5689
1742-5662
doi_str_mv 10.1098/rsif.2018.0578
publisher Royal Society
college_str College of Science
hierarchytype
hierarchy_top_id collegeofscience
hierarchy_top_title College of Science
hierarchy_parent_id collegeofscience
hierarchy_parent_title College of Science
department_str Biosciences{{{_:::_}}}College of Science{{{_:::_}}}Biosciences
url https://royalsocietypublishing.org/doi/full/10.1098/rsif.2018.0578
document_store_str 0
active_str 1
researchgroup_str Swansea Lab for Animal Movement
description Vultures are thought to form networks in the sky, with individuals monitoring the movements of others to gain up-to-date information on resource availability. While it is recognized that social information facilitates the search for carrion, how this facilitates the search for updrafts, another critical resource, remains unknown. In theory, birds could use information on updraft availability to modulate their flight speed, increasing their airspeed when informed on updraft location. In addition, the stylized circling behaviour associated with thermal soaring is likely to provide social cues on updraft availability for any bird operating in the surrounding area. We equipped five Gyps vultures with GPS and airspeed loggers to quantify the movements of birds flying in the same airspace. Birds that were socially informed on updraft availability immediately adopted higher airspeeds on entering the inter-thermal glide; a strategy that would be risky if birds were relying on personal information alone. This was embedded within a broader pattern of a reduction in airspeed (approx. 3 m s−1) through the glide, likely reflecting the need for low speed to sense and turn into the next thermal. Overall, this demonstrates (i) the complexity of factors affecting speed selection over fine temporal scales and (ii) that Gyps vultures respond to social information on the occurrence of energy in the aerial environment, which may reduce uncertainty in their movement decisions.
published_date 2018-11-01T16:22:51Z
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