RISK-SENSITIVITY - AMBIENT-TEMPERATURE AFFECTS FORAGING CHOICE

被引:152
作者
CARACO, T
BLANCKENHORN, WU
GREGORY, GM
NEWMAN, JA
RECER, GM
ZWICKER, SM
机构
[1] Behavioral ecology Group, Department of Biological Sciences, State University of New York, Albany
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0003-3472(05)80879-6
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Short-term physiological requirements strongly constrain some foragers. During the limited time available for foraging, they must consume sufficient food to meet all energetic expenditures for 24 h. Models for risk-sensitive, decision-making predict that such a forager should be risk-averse toward reward variance when the animal expects to meet its requirement, and should be risk-prone toward reward variance when expecting an energetic deficit. Some previous demonstrations of this shift from risk-averse to risk-prone behaviour relied on differences in both pre-experimental deprivation and inter-trial delays within an experiment to vary the subjects' energy budgets, and these differences have allowed an alternate interpretation of observed preferences. Therefore, earlier work on risk-sensitive foraging in small birds was complemented by manipulating ambient temperature to induce positive and negative expected energy budgets. For a given mean reward, the inter-trial delay was the same, constant length at both temperatures. When subjects experienced a positive energy budget (warm temperature), risk-aversion exceeded preference for risk strikingly; the opposite occurred when the subjects could anticipate a negative energy budget (cold temperature). Variation in inter-trial delays could not have influenced the change in preference reported here. © 1990.
引用
收藏
页码:338 / 345
页数:8
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