Seasonal shifts in diel vertical migrations by lake-dwelling coastal cutthroat trout, Oncorhynchus clarkii clarkii, reflect thermal regimes and prey distributions

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2023-05-09 DOI:10.1111/eff.12725
Zachary R. Thomas, David A. Beauchamp, Casey P. Clark, Thomas P. Quinn
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引用次数: 1

Abstract

Lakes provide important habitat for salmonids that may use them as a primary feeding area between periods of reproduction. The seasonal changes in vertical thermal structure in lakes can affect the distribution of salmonids on seasonal and diel time scales as they search for, consume, and digest prey that also exploits the water column's distribution of food, temperature and light. Our goal was to analyse the vertical distribution of wild, native coastal cutthroat trout (Oncorhynchus clarkii clarkii) in Lake Washington on daily and seasonal time scales. This lake is stratified in the summer and isothermal in winter, allowing us to compare vertical movements between periods with and without thermal structure in water 50 m deep. We predicted that trout would be deeper in the water column during stratified months and shallower during isothermal months, and shallower at night than in the day. Overall, the trout showed these patterns in the depths and temperatures they occupied, tending to be within or below the thermocline in the summer but not in the coolest water available, and closer to the surface when the lake was isothermal. The trout were also closer to the surface at night and deeper during the day. The vertical range of these diel movements shifted with the seasons–deepest in October, as the thermocline deepened and weakened, and shallowest in January when the lake was isothermal. These seasonal and diel vertical distribution patterns by the trout optimise metabolism for growth, and facilitate feeding on planktivorous fishes that also show seasonal and diel vertical distribution changes.

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湖栖沿海切喉鳟鱼(Oncorhynchus clarkii clarkii)垂直迁徙的季节变化反映了温度状况和猎物分布
湖泊为鲑科鱼提供了重要的栖息地,它们可能将湖泊作为繁殖期之间的主要觅食区。湖泊垂直热结构的季节性变化会影响鲑鱼在季节性和昼夜时间尺度上的分布,因为它们寻找、消耗和消化猎物,这些猎物也会利用水体的食物、温度和光线分布。我们的目标是分析华盛顿湖野生、本地沿海切喉鳟鱼(Oncorhynchus clarkii clarkii)在每日和季节性时间尺度上的垂直分布。这个湖在夏季是分层的,在冬季是等温的,这使我们能够比较50米深的水中有热结构和没有热结构时期的垂直运动。我们预测鳟鱼在分层月份会在水柱中更深,在等温月份会更浅,并且在夜间比白天更浅。总的来说,鳟鱼在它们所处的深度和温度上表现出这些模式,在夏天倾向于在温跃层内或以下,但不是在最冷的水里,当湖泊等温时更接近表面。鳟鱼晚上也更靠近水面,白天则更深。这些昼夜运动的垂直范围随着季节的变化而变化,随着温跃层的加深和减弱,10月最深,当湖泊等温时,1月最浅。这些季节性和垂直分布模式优化了鳟鱼的生长代谢,并促进了对浮游鱼类的摄食,这些鱼类也显示出季节性和垂直分布变化。
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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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