水体升温和生态情境对异育银鲫群体行为的影响
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国家自然科学基金项目(31300341);重庆市教委科技项目(KJQN202000539,KJQN201900540);重庆市留学人员回国创业创新支持计划项目(cx2019153)资助


Effects of water temperature rising and ecological context on collective behaviour of gibel carp
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    摘要:

    水温是影响鱼类生理行为及生活史的重要生态因子。极端气候变化和热(核)电站等的温排水常引起受纳水域的水温发生急速变化,对该水域的鱼类生命活动产生重要影响。为考察不同水体升温速率和生态情境类型对鱼类群体行为的影响,以异育银鲫(Carassius auratus gibelio)幼鱼为实验对象,在3个温度(恒温16℃、慢速升温及快速升温10℃)和3种生态情境(开放水域、食物及食物与隐蔽所)条件下观测实验鱼在升温前后集群行为(如个体游泳速度及其同步性、个体间距离、最近邻距离、极性及摄食等)的变化特征。结果显示:快速升温导致异育银鲫的个体游泳速度明显增加,而对照组和慢性升温组均未呈现此效应;不论快速升温还是慢速升温均未影响个体游泳速度同步性。个体游泳速度及其同步性随情境复杂性的增加而呈下降趋势。升温速率和情境类型对个体间距离和最近邻距离均未产生影响。虽然群体极性不受升温影响,但随生态情境复杂性的增加呈下降趋势。所有温度处理组的鱼群摄饵比例均在升温后明显提高,但无情境类型间的差异。实验鱼具有群体个性现象,其个体和群体特征具有重复性和表型关联。研究表明:水体快速升温不影响异育银鲫的群体凝聚力和协调性,但随生态情境复杂度的增加,个体游泳速度及其同步性和群体极性均下降,群体凝聚力却维持稳定。

    Abstract:

    Water temperature is a fundamental ecological factor that influences all aspects of physiology, behaviour and even life-history of fish. The extreme climate change and thermal discharged water produced by the power station often induce acute water temperature change of the received water body, which exerts important influences on survival and growth of fish living in this water body. Here, our study aimed at how different water temperature rising patterns and ecological context affected collective behaviour of the fish. The juvenile gibel carp (Carassius auratus gibelio) was used as fish model in this study. The collective behaviour traits, such as individual swimming speed, synchronization of individual swimming velocity, inter-individual distance, the nearest neighbor distance, group polarization as well as foraging, were examined at the initial and final of the experiment under the combined conditions of three temperature treatments (i.e., constant at 16 oC, slow and fast temperature rising with an increment of 10℃), and three ecological contexts (i.e., open water, food, and food plus refuge). The present study showed that the fish increased their individual swimming speed after the acute temperature rising, but this effect was not detected in both the control and slow temperature rising treatment. The synchronization of individual swimming speed did not change in both the fast and slow temperature rising treatment at the final of experiment. Contrary to our prediction, both the inter-individual distance and the nearest neighbor distance were not affected by both the water temperature rising and ecological context. Although the group polarization exhibited no change after the water temperature rising, it showed a decreased tendency as increased with complexity of ecological context. All of the percentage diet fed by fish shoals increased in the three temperature treatments after the water temperature rising, but not depended on the ecological contexts. The collective personality was found in the shoals of the gibel carp with exhibiting substantial behavioural differences between the groups persisted both within and across the ecological contexts. The repeatability and phenotypic correlations of both individual and group level characteristics were found over time and across ecological contexts. The present study suggested that the group cohesion and coordination maintained constantly after the water temperature rising, but the individual swimming speed and its synchronization, and the group polarity decreased as increased of complexity of the ecological contexts. However, the group cohesion could remain stability across different ecological contexts.

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李武新,马辉煌,于长暄,刘霜,雷家鸣,曾令清.水体升温和生态情境对异育银鲫群体行为的影响.生态学报,2022,42(22):9359~9370

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