Food web changes reflected in age-0 piscivore diets and growth

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2023-07-03 DOI:10.1111/eff.12737
Touhue Yang, Christine M. Mayer, Robin L. DeBruyne, Edward F. Roseman, Mark R. DuFour, Eric J. Weimer
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引用次数: 1

Abstract

Lake Erie walleye (Stizostedion vitreum) recruitment fluctuates annually and depends partially on their diet and growth during their first year of life. In recent decades, age-0 walleye diet and growth may be responding to food web changes in western Lake Erie. To determine how age-0 walleye have responded to changes in prey species and abundance, we compared diet between 2019, 2014 and 1994–1999. Larval walleye ate predominantly cyclopoids in 2019, compared to 1994–1999 when calanoids were the most consumed copepod. Juvenile walleye ate predominantly large cladocerans and benthic invertebrates in 2019, compared to 2014 and 1994 when fish was the most consumed prey. Additionally, in 2019 and 2014, age-0 walleye ate two of the current aquatic invasive species (AIS), Bythotrephes longimanus and Neogobius melanostomus, and the historical AIS, Osmerus mordax. Age-0 walleye were smaller in 2019 than in 2014 and switched to consuming more AIS and less fish suggesting that more energetically favourable prey were not available. While age-0 walleye showed adaptation to new prey and conditions, they had a lower quality diet because they consumed less fish, but also because the invasive fish they now consume have a lower energy density than native species. However, lower quality diet and size may not result in reduced survival, if adequate alternative prey is available. Continued monitoring of age-0 walleye diet could provide confirmation that lower diet quality during the first year decreased walleye growth and aid to identify any effects changes in age-0 diets has on recruitment to the adult population.

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食物网的变化反映了0岁- 0岁鱼鱼的饮食和生长
伊利湖白眼(Stizostedion vitum)的招募每年都有波动,部分取决于它们第一年的饮食和生长情况。近几十年来,0岁大的白眼鱼的饮食和生长可能会对伊利湖西部食物网的变化做出反应。为了确定0岁的白眼鱼是如何应对猎物种类和丰度的变化的,我们比较了2019年、2014年和1994-1999年之间的饮食。与1994-1999年消耗最多的角足类动物相比,2019年的幼虫主要吃环状动物。与2014年和1994年鱼类是最常食用的猎物相比,2019年的幼眼鱼主要吃大型卷尾海洋动物和底栖无脊椎动物。此外,在2019年和2014年,0岁大的白眼鱼吃掉了两种现有的水生入侵物种(AIS),即长形鱼(Bythotrephes longimanus)和黑口新虾(Neogobius melanostomus),以及历史上的水生入侵物种——莫达鱼(Osmerus mordax)。2019年,0岁大的白眼鱼比2014年更小,转而消耗更多的AIS和更少的鱼,这表明没有更有利能量的猎物。虽然0岁的白眼鱼表现出对新猎物和新环境的适应,但它们的饮食质量较低,因为它们消耗的鱼较少,但也因为它们现在消耗的入侵鱼的能量密度低于本地物种。然而,如果有足够的替代猎物,较低质量的饮食和体型可能不会导致存活率降低。持续监测0岁时的孔雀鱼饮食可以证实,第一年较低的饮食质量会降低孔雀鱼的生长,并有助于确定0岁时饮食变化对成年人群招募的任何影响。
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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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