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Abstract:

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.

Registro:

Documento: Artículo
Título:Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator
Autor:Carro, M.E.; Fernández, G.J.
Filiación:Laboratorio de Ecología y Comportamiento Animal, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int Guiraldes s/n, Pabellón II,Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:Collective vigilance; Group size; Individual vigilance; Instantaneous randomness; Predation risk; Rhea americana; Aves; Palaeognathae; Rhea; Rhea americana
Año:2009
Volumen:27
Número:3
Página de inicio:429
Página de fin:436
DOI: http://dx.doi.org/10.1007/s10164-008-0137-5
Título revista:Journal of Ethology
Título revista abreviado:J. Ethol.
ISSN:02890771
CODEN:JOETE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02890771_v27_n3_p429_Carro

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Citas:

---------- APA ----------
Carro, M.E. & Fernández, G.J. (2009) . Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator. Journal of Ethology, 27(3), 429-436.
http://dx.doi.org/10.1007/s10164-008-0137-5
---------- CHICAGO ----------
Carro, M.E., Fernández, G.J. "Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator" . Journal of Ethology 27, no. 3 (2009) : 429-436.
http://dx.doi.org/10.1007/s10164-008-0137-5
---------- MLA ----------
Carro, M.E., Fernández, G.J. "Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator" . Journal of Ethology, vol. 27, no. 3, 2009, pp. 429-436.
http://dx.doi.org/10.1007/s10164-008-0137-5
---------- VANCOUVER ----------
Carro, M.E., Fernández, G.J. Scanning pattern of greater rheas, Rhea americana: Collective vigilance would increase the probability of detecting a predator. J. Ethol. 2009;27(3):429-436.
http://dx.doi.org/10.1007/s10164-008-0137-5