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Patch use and vigilance behaviour by Nubian ibex: the role of the effectiveness of vigilance
Iribarren, Cecilia; Kotler, Burt P.
通讯作者Iribarren, Cecilia
来源期刊EVOLUTIONARY ECOLOGY RESEARCH
ISSN1522-0613
EISSN1937-3791
出版年2012
卷号14期号:2页码:223-234
英文摘要

Background: Brown (1999) presented a model for optimal levels of vigilance in foragers exploiting depletable resource patches. This theory includes vigilance along with time allocation, patch use, resource depletion, and energetic costs in a fitness-maximizing model. It predicts a humped-shaped relationship between the optimal level of vigilance and the effectiveness of vigilance.


Aim: To test Brown’s model with free-ranging Nubian ibex (Capra nabiana). Use specific predictions for ibex, including vigilance levels increasing and patch use decreasing with predation risk and with energetic state of the forager.


Site of experiments: Negev Desert, Israel.


Methods: Manipulate sight lines (lines between food and safety) to reduce the effectiveness of vigilance of Nubian ibex. Evaluate the resulting effects on foraging costs, patch use, and risk management behaviour (vigilance and apprehension). Quantify ibex vigilance by direct observations. Quantify patch use and apprehension by measuring giving-up densities (GUD, the amount of food left in a patch following exploitation) in artificial food patches that differ in complexity. We couple our manipulation of sight lines (effectiveness of vigilance) with placement of feeding trays near and far from a refuge (to manipulate the risk of predation) and with augmentation of food (to manipulate the energetic state of the forager).


Results: Brown’s model was supported. Nubian ibex were more vigilant and/or more apprehensive, and depleted food patches less thoroughly (left higher GUDs) in patches farther from a cliff (risky), in the presence of sight-line obstructions (low effectiveness of vigilance), and when food was augmented (low marginal value of energy).


英文关键词foraging theory giving-up densities Nubian ibex optimal patch use optimal vigilance risk management time allocation trade-offs of food and safety
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000309784900006
WOS关键词PREDATION RISK ; APPREHENSION ; PREFERENCE ; GERBILS ; COVER ; COSTS
WOS类目Ecology ; Evolutionary Biology ; Genetics & Heredity
WOS研究方向Environmental Sciences & Ecology ; Evolutionary Biology ; Genetics & Heredity
来源机构Ben-Gurion University of the Negev
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172312
作者单位Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Mitrani Ctr Desert Ecol, IL-84900 Sede Boqer, Israel
推荐引用方式
GB/T 7714
Iribarren, Cecilia,Kotler, Burt P.. Patch use and vigilance behaviour by Nubian ibex: the role of the effectiveness of vigilance[J]. Ben-Gurion University of the Negev,2012,14(2):223-234.
APA Iribarren, Cecilia,&Kotler, Burt P..(2012).Patch use and vigilance behaviour by Nubian ibex: the role of the effectiveness of vigilance.EVOLUTIONARY ECOLOGY RESEARCH,14(2),223-234.
MLA Iribarren, Cecilia,et al."Patch use and vigilance behaviour by Nubian ibex: the role of the effectiveness of vigilance".EVOLUTIONARY ECOLOGY RESEARCH 14.2(2012):223-234.
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