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Author Taraborelli, P. ♦ Ovejero, R. ♦ Mosca Torres, M. E. ♦ Schroeder, N. M. ♦ Moreno, P. ♦ Gregorio, P. ♦ Marcotti, E. ♦ Marozzi, A. ♦ Carmanchahi, P.
Source SpringerLink
Content type Text
Publisher Springer Berlin Heidelberg
File Format PDF
Copyright Year ©2014
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Life sciences; biology
Subject Keyword Behavioural reactions ♦ Human disturbance ♦ Predation risk ♦ Social group ♦ Ungulate ♦ Zoology ♦ Animal Physiology ♦ Behavioural Sciences ♦ Animal Ecology ♦ Evolutionary Biology ♦ Animal Anatomy ♦ Morphology ♦ Histology
Abstract Animals optimize the trade-off between the cost of not fleeing and the benefits of staying because the factors that influence flight decisions and the disturbance level of a particular stimulus can vary both spatially and temporally. Different factors (human impact and habitat characteristics) likely to modify anti-predator behaviour in different types of guanaco social groups were analysed. We found that group size was conditioned by high poaching, vehicle traffic, predation risk and vegetation density. Solitary adult males showed shorter alert and flight initiation distances than bachelor and mixed groups. Alert distance was greater during the summer season, and assessment times were shorter when young were present in the groups. In high-predation-risk environments, guanacos detected threats at greater distances and flight initiation distance was longer. Alert distances were shorter on steeper sloped hills and assessment times were shorter in areas with irregular topography than on flat sites. In high traffic areas, flight initiation distance was longer and assessment times were shorter. And in areas with low poaching intensity, assessment times were greater than in those with high poaching levels. Therefore, guanacos may be able to evaluate a true threat. Social group and anti-predator responses were conditioned by habitat characteristics and human impact. We consider that plasticity of responses could be key to the survival of guanacos.
ISSN 00017051
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2014-04-16
Publisher Place Berlin, Heidelberg
e-ISSN 21903743
Journal Acta Theriologica
Volume Number 59
Issue Number 4
Page Count 11
Starting Page 529
Ending Page 539


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Source: SpringerLink