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首页> 外文期刊>Ethology >Corticosterone, Avoidance of Novelty, Risk-Taking and Aggression in a Wild Bird: No Evidence for Pleiotropic Effects
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Corticosterone, Avoidance of Novelty, Risk-Taking and Aggression in a Wild Bird: No Evidence for Pleiotropic Effects

机译：皮质酮，避免新颖性，冒险和侵略性在野生鸟类：没有证据为多效性的影响

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Certain inherent characteristics of individuals can determine both physiological and behavioural responses to environmental challenges, which could drive a correlation between levels of corticosterone (CORT), the most important stress hormone and behavioural profiles. Therefore, CORT level may mediate consistent behaviours along the shy/bold continuum, and thus, it could serve as a pleiotropic basis for behavioural syndromes. Moreover, behavioural responses to environmental challenges may have consequences for CORT concentrations, which would also result in a correlation between physiology and behaviours even without requiring pleiotropic mechanisms. Accordingly, we investigated the relationship between CORT and behaviour in free-living male collared flycatchers, Ficedula albicollis, using recently developed field assays. More specifically, we characterised novel object avoidance, intraspecific aggression and risk-taking in males and related these correlated behaviours to the concentration of CORT metabolites in droppings measured by enzyme immunoassay. Individuals with higher levels of excreted CORT metabolites had no consistently higher or lower behavioural scores along the shy/bold spectrum, as avoidance of novelty, aggression and risk-taking were not systematically related to CORT metabolite concentrations in the same direction. Moreover, environmental challenges owing to the presence of a novel object, territorial intruder and a potential predator caused no elevation in the level of CORT metabolites. Therefore, we did not find correlative evidence for CORT driving correlated behaviours through pleiotropic effects or for particular behaviours during courtship causing elevation in CORT levels.
机译：个人的某些固有特征可以确定对环境挑战的生理和行为响应，这可能促使皮质酮（CORT），最重要的应激激素水平与行为特征之间存在相关性。因此，CORT水平可以在害羞/大胆连续体上介导一致的行为，因此，它可以作为行为综合症的多效基础。此外，对环境挑战的行为反应可能会对CORT浓度产生影响，即使不需要多效性机制，也可能导致生理与行为之间的相关性。因此，我们使用最近开发的田间试验研究了自由生存的雄性环斑捕蝇器Ficedula albicollis中CORT与行为之间的关系。更具体地说，我们表征了男性中避免新对象，种内侵略和冒险的特征，并将这些相关行为与通过酶免疫法测定的粪便中CORT代谢产物的浓度相关。排泄的CORT代谢物水平较高的个体在害羞/粗体频谱上的行为得分没有始终较高或较低，因为避免新颖性，攻击性和冒险精神与CORT代谢物浓度在同一方向上没有系统地相关。此外，由于存在新物体，领土入侵者和潜在的掠食者而引起的环境挑战并未导致CORT代谢物水平的升高。因此，我们没有找到通过多效效应驱动CORT相关行为的相关证据，也没有找到导致CORT水平升高的求爱过程中的特定行为的相关证据。

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