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首页> 外文期刊>Ethology >Effects of Temperature on the Antipredator Behaviour and on the Cholinergic Expression in the European Sea Bass (Dicentrarchus labrax L.) Juveniles
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Effects of Temperature on the Antipredator Behaviour and on the Cholinergic Expression in the European Sea Bass (Dicentrarchus labrax L.) Juveniles

机译：温度对欧洲鲈鱼（Dicentrarchus labrax L.）幼鱼的抗捕食者行为和胆碱能表达的影响

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In this paper, an experimental approach was used to test for the parallel effects of temperature (T) increase on the antipredator behaviour and the cholinergic expression in the juvenile European sea bass (Dicentrarchus labrax L.). The effects of three T treatments (18, 22 and 26 degrees C) were tested on the main behavioural components of the antipredator response towards live aquatic predators and aerial simulated attacks, whereas brain cholinergic expression was evaluated by choline acetyltransferase (ChAT) immunoblotting (Western blot) at the extreme values of the thermal range (18 and 26 degrees C). Antipredator responses towards a live fish were analysed over pre-exposure and exposure phases within a short temporal scale (20s before and after the stimulus). The results suggest that T modulates several quantitative components of the antipredator behaviour. The mean shoaling index (shoal cohesiveness) was higher at 22 degrees C than at 18 and 26 degrees C during both the pre-stimulus and the exposure phase. Conversely, the mean distances from the predator and the tank bottom were, respectively, lower and higher at 26 degrees C than in the other two treatments. In regard to the antipredator response on the aerial stimulus, comparisons across treatments revealed statistically significant differences between fish performing freezing or latency to recovery, suggesting that the fright reaction has a higher persistence at the coldest T (18 degrees C) than at 22 and 26 degrees C. Western blot analysis revealed a reduction in brain ChAT expression in fish acclimated to 26 degrees C compared to those at 18 degrees C. Results were discussed in the light of the relationships between behavioural traits, metabolism and their consequences on the population level, as a response to climate change in coastal habitats.
机译：在本文中，一种实验方法用于测试温度（T）升高对欧洲鲈鱼（Dicentrarchus labrax L.）的抗捕食者行为和胆碱能表达的平行影响。测试了三种T处理（分别在18、22和26摄氏度时）对抗捕食者对活水生捕食者和空中模拟袭击的主要行为成分的影响，而脑胆碱能的表达则通过胆碱乙酰基转移酶（ChAT）免疫印迹进行了评估（Western印迹）在温度范围（18和26摄氏度）的极端值下进行。在短暂的时间范围内（刺激前后20秒），在暴露前和暴露阶段分析了对活鱼的抗捕食者反应。结果表明，T调节了反捕食者行为的几个定量成分。在刺激前和暴露阶段，平均浅滩指数（浅滩凝聚力）在22摄氏度时均高于18和26摄氏度。相反，在26摄氏度时，距掠食者和坦克底部的平均距离分别比其他两种处理方法小和大。关于空中刺激物上的抗捕食者反应，各处理之间的比较表明，执行冷冻或恢复潜伏期的鱼之间存在统计学上的显着差异，这表明在最冷的T（18摄氏度）下，惊恐反应的持久性高于在22和26摄氏度下Western印迹分析显示，与18摄氏度时相比，适应26摄氏度的鱼脑ChAT表达降低。根据行为特征，代谢及其对种群水平的影响之间的关系讨论了结果，应对沿海生境的气候变化。

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