寡营养水库中小鱼入侵后鲑鱼食性的转变

IF 1.6 3区 农林科学 Q3 FISHERIES
Rachelle C. Johnson, Marshal S. Hoy, Karl D. Stenberg, Jonathan H. Mclean, Benjamin L. Jensen, Tessa J. Code, Carl O. Ostberg, David A. Beauchamp
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引用次数: 0

摘要

捕食在生态群落结构中扮演着重要角色,而捕食者-猎物的动态会随着新物种的引入而改变。美国华盛顿州斯卡吉特河上游的水库在未经授权的情况下引入了红鲱鱼(Richardsonius balteatus),这引起了人们的关注,因为水库中捕食者与猎物之间的动态变化可能会降低流域中本地鲑鱼的繁殖和产量。我们估算了罗斯湖中非本地红鲱鱼和本地鲑鱼幼鱼的捕食死亡率,以评估捕食在调节这些种群和限制本地相关物种生存方面的潜在作用。我们利用生物能量学建模和稳定同位素分析,结合对食鱼鲑鱼的生长、季节性饮食和热体验的实地测量,量化它们对猎物鱼类的消耗需求,以评估外来红鲱鱼和本地鲑鱼捕食死亡率的相对大小。虽然红鲱鱼是罗斯湖中最主要的猎物鱼类,但被吃掉的本地鲑鱼生物量不大,可能会导致大量死亡,其程度取决于猎物鱼类被吃掉的时间和大小。这些信息为非本地物种如何通过共同捕食(明显竞争)间接影响本地物种提供了重要依据,并可为有关非本地物种控制、本地鲑科鱼类的可持续性和溯河鱼类的引入等保护决策提供信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shift in piscivory by salmonids following invasion of a minnow in an oligotrophic reservoir

Predation can play an important role in structuring ecological communities, and predator–prey dynamics can be altered following the introduction of new species. An unauthorized introduction of redside shiner (Richardsonius balteatus) into reservoirs in the Upper Skagit River, Washington, USA created concern that a consequent shift in predator–prey dynamics in the reservoirs could reduce recruitment and production of native salmonids in the basin. We estimated predation mortality in Ross Lake on nonnative redside shiner and juvenile native salmonids to evaluate the potential role of predation in regulating these populations and limiting survival of native species of concern. We used bioenergetics modelling and stable isotope analysis combined with directed field measurements of growth, seasonal diet and thermal experience of piscivorous salmonids to quantify their consumption demand on prey fishes to evaluate the relative magnitude of predation mortality on invasive redside shiners and native salmonids. While redside shiner are the dominant prey fish species in Ross Lake, the modest biomass of native salmonids consumed could translate into substantial mortality, the magnitude of which depended on the timing and size at which prey fishes were eaten. This information provides important context for how nonnative species may indirectly impact native species through shared predation (apparent competition) and can inform conservation decisions surrounding nonnative species control, sustainability of native salmonids and introductions of anadromous fishes.

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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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