Instituto Mediterráneo de Estudios Avanzados (IMEDEA, UIB-CSIC), Esporles, Balearic Islands, Spain.
IRFAP LIMIA (Laboratorio de Investigaciones Marinas y Acuicultura), Andratx, Balearic Islands, Spain.
Sci Rep. 2023 Nov 20;13(1):20281. doi: 10.1038/s41598-023-45579-1.
Chronotypes, the individual differences in daily activity timing, have profound associations with numerous physiological processes. Despite this, the covariance between chronotypes and other aspects of an individual's behaviour has been infrequently explored in non-human animals. This study delves into individual's variation across four axes of personality in a controlled environment, utilising the pearly razorfish, a model species for fish chronotype studies. We identified behavioural types across the aggressiveness continuum and established behavioural syndromes amongst exploration, activity, and boldness, irrespective of body size and condition. Subsequent to this, the experimental subjects were reintroduced to their natural habitat and individually tracked using high-resolution technology to ascertain their chronotypes. Our results revealed that whilst the exploration-activity-boldness syndrome bore no correlation with chronotypes, a significant association was observed between aggressiveness and chronotype. Hence, individuals with later awakening times and rest onsets were more aggressive than their counterparts with earlier awakening times and rest onsets. This study provides pioneering evidence linking fish chronotypes with other behavioural traits, such as aggressiveness, suggesting that behavioural variation could be potentially linked to the individuals' variation in internal clocks and the environmental variables influencing their expression.
时型，即个体日常活动时间的差异，与许多生理过程有着深远的关联。尽管如此，在非人类动物中，时型与个体行为的其他方面之间的协变关系仍很少被探索。本研究在受控环境中利用珍珠刀鱼（一种用于鱼类时型研究的模式物种），深入探讨了个体在四个人格轴上的变化。我们在攻击性连续体上确定了行为类型，并建立了探索、活动和大胆行为之间的行为综合征，而不考虑体型和条件。之后，实验对象被重新引入到其自然栖息地，并使用高分辨率技术对其进行个体跟踪，以确定他们的时型。我们的结果表明，尽管探索-活动-大胆行为综合征与时型没有相关性，但攻击性与时型之间存在显著关联。因此，觉醒时间和休息起始时间较晚的个体比觉醒时间和休息起始时间较早的个体更具攻击性。这项研究提供了将鱼类时型与其他行为特征（如攻击性）联系起来的开创性证据，表明行为变化可能与个体内部时钟的变化以及影响其表达的环境变量有关。
