Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator

Many models using vigilance to predict the probability of detecting an approaching predator assumes that prey scanning events should be produced at random. Consequently, the length of intervals among successive scans must follow a negative exponential distribution. We analyzed the scanning behavior...

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Autores principales: Carro, M.E., Fernández, G.J.
Formato: JOUR
Materias:
Collective vigilance
Group size
Individual vigilance
Instantaneous randomness
Predation risk
Rhea americana
Aves
Palaeognathae
Rhea
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02890771_v27_n3_p429_Carro
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02890771_v27_n3_p429_Carro
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spelling todo:paper_02890771_v27_n3_p429_Carro2023-10-03T15:17:17Z Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator Carro, M.E. Fernández, G.J. Collective vigilance Group size Individual vigilance Instantaneous randomness Predation risk Rhea americana Aves Palaeognathae Rhea Rhea americana Many models using vigilance to predict the probability of detecting an approaching predator assumes that prey scanning events should be produced at random. Consequently, the length of intervals among successive scans must follow a negative exponential distribution. We analyzed the scanning behavior of the greater rhea, Rhea americana, which is a gregarious, flightless bird, in eastern Argentina. We investigated whether individual and/or collective scanning departed from random and whether this departure varied with group size. We used two simulation models based on observed scanning sequences to assess the effectiveness of vigilance on the individual and collective level when faced with an opportunistic or stalking predator. The analysis of 59 behavioral sequences of wild greater rheas foraging solitary or in groups of two to six or more individuals revealed that the inter-scan length of individual sequences significantly departed from random. In contrast, inter-scan intervals for collective vigilance were shorter than individual ones, but only fit the random expectation for groups of two and five individuals. Models showed that collective vigilance could increase the probability of detecting a predator, thereby reducing their vulnerability, independent of whether the predator uses a stalking or opportunistic approaching strategy. © Japan Ethological Society and Springer 2008. Fil:Carro, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fernández, G.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02890771_v27_n3_p429_Carro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Collective vigilance
Group size
Individual vigilance
Instantaneous randomness
Predation risk
Rhea americana
Aves
Palaeognathae
Rhea
Rhea americana
spellingShingle Collective vigilance
Group size
Individual vigilance
Instantaneous randomness
Predation risk
Rhea americana
Aves
Palaeognathae
Rhea
Rhea americana
Carro, M.E.
Fernández, G.J.
Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
topic_facet Collective vigilance
Group size
Individual vigilance
Instantaneous randomness
Predation risk
Rhea americana
Aves
Palaeognathae
Rhea
Rhea americana
description Many models using vigilance to predict the probability of detecting an approaching predator assumes that prey scanning events should be produced at random. Consequently, the length of intervals among successive scans must follow a negative exponential distribution. We analyzed the scanning behavior of the greater rhea, Rhea americana, which is a gregarious, flightless bird, in eastern Argentina. We investigated whether individual and/or collective scanning departed from random and whether this departure varied with group size. We used two simulation models based on observed scanning sequences to assess the effectiveness of vigilance on the individual and collective level when faced with an opportunistic or stalking predator. The analysis of 59 behavioral sequences of wild greater rheas foraging solitary or in groups of two to six or more individuals revealed that the inter-scan length of individual sequences significantly departed from random. In contrast, inter-scan intervals for collective vigilance were shorter than individual ones, but only fit the random expectation for groups of two and five individuals. Models showed that collective vigilance could increase the probability of detecting a predator, thereby reducing their vulnerability, independent of whether the predator uses a stalking or opportunistic approaching strategy. © Japan Ethological Society and Springer 2008.
format JOUR
author Carro, M.E.
Fernández, G.J.
author_facet Carro, M.E.
Fernández, G.J.
author_sort Carro, M.E.
title Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
title_short Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
title_full Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
title_fullStr Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
title_full_unstemmed Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
title_sort scanning pattern of greater rheas, rhea americana: collective vigilance would increase the probability of detecting a predator
url http://hdl.handle.net/20.500.12110/paper_02890771_v27_n3_p429_Carro
work_keys_str_mv AT carrome scanningpatternofgreaterrheasrheaamericanacollectivevigilancewouldincreasetheprobabilityofdetectingapredator
AT fernandezgj scanningpatternofgreaterrheasrheaamericanacollectivevigilancewouldincreasetheprobabilityofdetectingapredator
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