Thermal stress affects patch time allocation by preventing forgetting in a parasitoid wasp

被引:26
作者
Abram, Paul K. [1 ,2 ]
Cusumano, Antonino [3 ]
Peri, Ezio [3 ]
Brodeur, Jacques [1 ]
Boivin, Guy [2 ]
Colazza, Stefano [3 ]
机构
[1] Univ Montreal, Inst Rech Biol Vegetale, Dept Sci Biol, Montreal, PQ H1X 2B2, Canada
[2] Agr & Agroalimentaire Canada, Ctr Rech & Dev Hort, St Jean, PQ, Canada
[3] Univ Palermo, Dipartimento Sci Agr & Forestali, I-90133 Palermo, Italy
基金
加拿大自然科学与工程研究理事会;
关键词
foraging; host associated cues; learning; optimal memory window; temperature; Trissolcus basalis; FORAGING BEHAVIOR; NATURAL VARIATION; MEMORY DYNAMICS; LEARNING RATE; TEMPERATURE; HYMENOPTERA; HABITUATION; DROSOPHILA; ECOLOGY; STRATEGIES;
D O I
10.1093/beheco/arv084
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
Learning and memory allow animals to adjust their foraging strategies through experience. Despite the known impact of temperature on many aspects of the behavioral ecology of animals, memory retention in the face of realistic thermal stress has seldom been assessed. In the laboratory, we studied the behavioral expression of an egg parasitoid's (Trissolcus basalis) memory when exposed to thermal stress that could be encountered in nature. We hypothesized that thermal stress would disrupt memory consolidation and/or modify the optimality of memory retention, thus affecting patch time allocation strategies. Memory consolidation was resilient to 1 h of thermal stress following an unrewarded experience (learning) on a patch of host-associated infochemicals. Neither high (40 degrees C) or low (10 degrees C) thermal stress changed the intensity of the experienced wasps' behavioral response relative to those held at a moderate temperature (25 degrees C). Next, we investigated how temperature stress could affect the parasitoids' memory retention ("forgetting"). When kept at a constant moderate temperature after learning, residence times of wasps retested on host cues increased relative to controls (naive wasps) over a period of 4 days as they presumably "forgot." However, both hot and cool daily temperature cycles prevented forgetting; the residence times of retested experienced wasps in these treatments did not change relative to controls over time. We discuss to what extent this may be an adaptive response by the parasitoids versus a physiological constraint imposed by temperature. Our findings contribute to an understanding of the impact of thermal stress on foraging strategies that involve learning and memory.
引用
收藏
页码:1326 / 1334
页数:9
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