Cooperative sentinel calling? Foragers gain increased biomass intake.

Current Biology : CB
Linda I HollénAndrew N Radford

Abstract

Many foraging animals face a fundamental tradeoff between predation and starvation. In a range of social species, this tradeoff has probably driven the evolution of sentinel behavior, where individuals adopt prominent positions to watch for predators while groupmates forage. Although there has been much debate about whether acting as a sentinel is a selfish or cooperative behavior, far less attention has focused on why sentinels often produce quiet vocalizations (hereafter known as "sentinel calls") to announce their presence. We use observational and experimental data to provide the first evidence that group members gain an increase in foraging success by responding to these vocal cues given by sentinels. Foraging pied babblers (Turdoides bicolor) spread out more, use more exposed patches, look up less often, and spend less time vigilant in response to sentinel calling. Crucially, we demonstrate that these behavioral alterations lead to an increase in biomass intake by foragers, which is likely to enhance survival. We argue that this benefit may be the reason for sentinel calling, making it a truly cooperative behavior.

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Citations

Apr 15, 2009·Proceedings. Biological Sciences·Andrew N RadfordMatthew B V Bell
Jun 6, 2009·Proceedings. Biological Sciences·M B V BellA R Ridley
Jun 4, 2010·Proceedings. Biological Sciences·M B V BellA R Ridley
Jul 13, 2012·Proceedings. Biological Sciences·Andrew N Radford, Tim W Fawcett
Feb 8, 2013·Proceedings. Biological Sciences·Markus ZöttlMichael Taborsky
Aug 8, 2009·Biological Reviews of the Cambridge Philosophical Society·Steven L Lima
Oct 11, 2011·PloS One·Linda I HollénAndrew N Radford
Jun 14, 2013·PeerJ·Mark C Mainwaring, Simon C Griffith
Sep 26, 2015·Scientific Reports·Simon J Brandl, David R Bellwood
Mar 3, 2011·Evolution; International Journal of Organic Evolution·Andrew N RadfordAmanda R Ridley
Apr 5, 2012·The Journal of Animal Ecology·Martha J Nelson-FlowerAmanda R Ridley
Aug 14, 2009·The Journal of Animal Ecology·Nichola J RaihaniAmanda R Ridley
Jun 12, 2014·Biological Reviews of the Cambridge Philosophical Society·Robert D MagrathAndrew N Radford
May 8, 2016·Proceedings of the National Academy of Sciences of the United States of America·Sabrina EngesserSimon W Townsend
Sep 7, 2016·Environmental Pollution·Julie M Kern, Andrew N Radford
Apr 8, 2017·Royal Society Open Science·Roni Ostreiher, Aviad Heifetz
Jul 1, 2017·Proceedings. Biological Sciences·Alexandra McQueenAnne Peters
May 31, 2018·Proceedings of the National Academy of Sciences of the United States of America·Julie M Kern, Andrew N Radford
Aug 19, 2017·Scientific Reports·Noori ChoiWon Young Lee
Sep 5, 2019·PloS One·Marie V LillyKeith A Tarvin

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