Artificial light at night affects fish passage rates in two small-sized Cypriniformes fish

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

Abstract

An increasing presence of instream structures such as weirs, dams, culverts and reservoirs degrades habitats, fragments rivers and blocks fish movements worldwide. Longitudinal river movements are fundamental for many fish species and the most widespread solution to restore longitudinal connectivity is the implementation of different fish passage solutions. Fishway functionality, however, is highly variable. To design a functional fishway, several aspects of the fish's interaction with its environment need to be taken into consideration. Artificial light at night (ALAN) can affect a range of different behaviours in fish, from activity and movement to feeding and predator–prey relationships. In a fish passage setting, fish are exposed to artificial light at night (ALAN) in the form of light pollution, but, sometimes, also as part of the fish passage solution. Although likely highly species specific, the effect of artificial light on fish passage behaviour has been little explored. Here we study the passage behaviour of two small-sized fish species, European gudgeon (Gobio gobio) and Italian riffle dace (Telestes muticellus), over a scaled deep side notch weir in a hydraulic flume in three different light conditions: daylight, darkness and ALAN. Although both species passed the obstacle at high efficiencies under all light conditions, their passage behaviours were influenced by light, particularly at the higher levels. While ALAN reduced passage success and resulted in delayed passage for gudgeon, riffle dace passed at higher rates under the artificial light compared to night treatment. Both results indicate a risk of negative effects from ALAN on passage performance at real fishways—or movement rates in lit areas of natural streams—for both species. Independent of light conditions, individuals of both species also passed faster after repeated trials, demonstrating learning in a fish passage context.

Abstract Image

夜间人工照明影响两种小型鲤形目鱼类的通过率
围堰、水坝、涵洞和水库等内河结构的日益增多,使世界各地的栖息地退化,河流支离破碎,鱼类活动受阻。河流的纵向流动对许多鱼类物种至关重要,而恢复纵向连通性的最普遍解决方案就是实施不同的鱼道解决方案。然而,鱼道的功能却千差万别。要设计一条功能性鱼道,需要考虑鱼类与环境互动的几个方面。夜间人工照明(ALAN)会影响鱼类的一系列不同行为,从活动和移动到觅食和捕食关系。在鱼类通道环境中,鱼类会以光污染的形式暴露在夜间人造光(ALAN)下,但有时也会作为鱼类通道解决方案的一部分。尽管人工光对鱼类通过行为的影响可能具有高度的物种特异性,但这方面的研究却很少。在此,我们研究了两种小型鱼类--欧洲箭鱼(Gobio gobio)和意大利鲤鱼(Telestes muticellus)--在三种不同的光照条件(日光、黑夜和 ALAN)下通过水槽中的鳞片状深边缺口堰的行为。尽管在所有光照条件下,两种鱼类都能高效通过障碍物,但它们的通过行为受到光照的影响,尤其是在较高光照条件下。ALAN 降低了箭鱼的通过成功率,并导致其通过时间延迟,但与夜间相比,箭鱼在人工光照下的通过率更高。这两项结果都表明,ALAN 有可能对两种鱼类在实际鱼道上的通过性能或在自然溪流光照区的活动速率产生负面影响。与光照条件无关的是,这两种鱼的个体在重复试验后通过的速度也更快,这证明了在鱼类通过环境下的学习效果。
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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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