个体活动水平和同类的存在影响鱼类通过水槽内障碍物的速度

IF 1.6 3区 农林科学 Q3 FISHERIES
Daniel Nyqvist, Fabio Tarena, Alessandro Candiotto, Claudio Comoglio
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引用次数: 0

摘要

水坝和其他溪流中的障碍物会破坏纵向连接,阻碍鱼类在栖息地之间移动。鱼道和其他鱼类通道解决方案被用来让鱼类越过这些人工洄游障碍。然而,鱼道的功能因鱼道设计和环境条件的不同而有很大差异,并取决于鱼类的种类和特性。特别是,游泳性能和鱼类行为被认为是预测鱼类通道性能的关键特征。众所周知,同种鱼类的存在会影响鱼类的通过行为,但这一点尚未得到很好的量化。在这项研究中,我们量化了带有 PIT 标记的鰕虎鱼(Gobio gobio)通过水槽中按比例缩放的深边缺口堰的个体通过率。然后,我们对相同个体鱼类的个体游泳能力(疲劳时间)和活动水平(在露天场地测试中的移动距离)进行了量化,并测试了对鱼类通过率的潜在影响。为了检测潜在的群体效应,我们对单条鱼或五条一组的鱼重复了通过实验。与活动较少的鱼相比,活动较多的鱼通过率更高;与单独通过障碍物相比,五人一组的鱼通过率更高。没有发现鱼的游动能力对通过率有影响。这一结果突出表明,在鱼类通过研究和评估中,需要考虑个体差异以及同类的存在和行为。这样做有可能增进对鱼类行为的了解,最终设计出鱼类通过的解决方案。未来的研究应针对自由活动的鱼类以及与原地鱼类通道解决方案相关的鱼类探讨这些结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Individual activity levels and presence of conspecifics affect fish passage rates over an in-flume barrier

Individual activity levels and presence of conspecifics affect fish passage rates over an in-flume barrier

Dams and other in-stream obstacles disrupt longitudinal connectivity and hinder fish from moving between habitats. Fishways and other fish passage solutions are used to pass fish over these artificial migration barriers. Fish passage functionality, however, varies greatly with fish passage design and environmental conditions and depends on fish species and characteristics. In particular, swimming performance and fish behaviour are considered key characteristics to predict fish passage performance. It is also well known, but not well quantified, that the presence of conspecifics affects fish passage behaviour. In this study, we quantified individual passage rates of PIT-tagged gudgeons (Gobio gobio) over a scaled deep side notch weir in an hydraulic flume. We then quantified individual swimming capability (time to fatigue) and activity level (distance moved in an open field test) for the same individual fish and tested for potential effects on fish passage rate. To check for potential group effects, we then repeated the passage experiment for fish individually or in groups of five. More active fish displayed higher passage rates compared to less active fish, and fish passed the obstacle at higher rates in groups of five compared to alone. No effect of fish swimming capability on passage rates was detected. This result highlights the need to take both individual variation as well as the presence and behaviour of conspecifics into account in fish passage studies and evaluations. Doing so has the potential to improve the understanding of fish behaviour, and in the end, the design of fish passage solutions. Future studies should explore these results on free ranging fish and in relation to in-situ fish passage solutions.

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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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