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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
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ISSN | 1522-0613 |
EISSN | 1937-3791 |
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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