Response to environmental change in rainbow trout selected for divergent stress coping styles
Response to environmental change in rainbow trout selected for divergent stress coping styles
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DOI：
10.1016/j.physbeh.2010.11.023
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发表时间：
2011-03-01
影响因子：
2.9
通讯作者：
Hoglund, Erik
中科院分区：
文献类型：
--
作者：
de Lourdes Ruiz-Gomez, Maria;Huntingford, Felicity A.;Hoglund, Erik
大量文献记录了个体动物应对环境挑战和压力的方式的差异。行为和生理应激反应的两种广泛的个体差异模式被描述为主动和反应性应激应对方式。除了压力反应的可变性之外，不同的应对方式可能包括行为灵活性的一般差异，而不是应对更微妙的环境变化和无威胁的新奇事物的常规形成。在本研究中，两种不同的操作，从先前学习的位置重新定位食物，以及引入新的物体，在虹鳟鱼选择高（HR）和低（LR）应激后血浆皮质醇水平时产生了截然不同的反应。在学习原始食物位置的速度上没有发现差异：然而，主动LR鱼在改变食物寻找行为以应对重新定位的食物方面明显慢于被动HR鱼。相比之下，LR鱼在很大程度上忽略了一个干扰HR鱼摄食的新物体。因此，这两条线对环境线索的评价似乎不同。这一观察结果表明，对环境变化的反应差异是遗传应激应对方式的一个组成部分，在这种特殊情况下，对不同情况下的觅食效率有相反的影响。因此，环境依赖的适应度效应可以解释这种进化广泛的特征复合体的稳定分化的持久性。(C) 2010爱思唯尔公司版权所有。
An extensive literature has documented differences in the way individual animals cope with environmental challenges and stressors. Two broad patterns of individual variability in behavioural and physiological stress responses are described as the proactive and reactive stress coping styles. In addition to variability in the stress response, contrasting coping styles may encompass a general difference in behavioural flexibility as opposed to routine formation in response to more subtle environmental changes and non-threatening novelties. In the present study two different manipulations, relocating food from a previously learned location, and introducing a novel object yielded contrasting responses in rainbow trout selected for high (HR) and low (LR) post stress plasma cortisol levels. No difference was seen in the rate of learning the original food location: however, proactive LR fish were markedly slower than reactive HR fish in altering their food seeking behaviour in response to relocated food. In contrast, LR fish largely ignored a novel object which disrupted feeding in HR fish. Hence, it appears that the two lines appraise environmental cues differently. This observation suggests that differences in responsiveness to environmental change are an integral component of heritable stress coping styles, which in this particular case, had opposite effects on foraging efficiency in different situations. Context dependent fitness effects may thus explain the persistence of stable divergence of this evolutionary widespread trait complex. (C) 2010 Elsevier Inc. All rights reserved.