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Elevated algal and sedimentary turbidity alter prey consumption by emerald shiner ( Notropis atherinoides )
Ecology of Freshwater Fish ( IF 1.8 ) Pub Date : 2019-11-12 , DOI: 10.1111/eff.12517
Chelsey L. Nieman 1, 2 , Suzanne M. Gray 1
Affiliation  

Anthropogenic increases to turbidity (suspended particulates) in the water column can alter the underwater visual environment, resulting in disruptions to visual signals in fishes exposed to these conditions. However, dissimilar turbidity types (e.g. sedimentary or algal particles) are expected to influence the visual environment in different ways as they exhibit differing physical characteristics. The main objective of this study was to determine the influence of elevated turbidity on prey consumption in emerald shiner (Notropis atherinoides). A secondary goal was to determine the relationship between visual morphological structures (i.e. eyes and optic lobe of brain) and prey consumption in different visual environments. We tested emerald shiner consumption of Daphnia magna in three turbidity types (sedimentary, algal and sedimentary + algal) at two different levels (20 NTU and 40 NTU) as well as in a clear (<5 NTU) control. We found that prey consumption decreased in high turbidity (40 NTU) across turbidity types relative to the control treatment. Further, consumption was lower in each treatment relative to the control with the exception of the moderate (20 NTU) sedimentary turbidity treatment. This study indicates that for emerald shiner, while high levels of turbidity are likely to suppress foraging, moderate levels of sedimentary turbidity may be slightly beneficial for foraging success. Further, it is likely that increases in algal turbidity via cultural eutrophication are likely to result in reductions in prey consumption.

中文翻译:

升高的藻类和沉积物浊度改变了翡翠发光者( Notropis atherinoides )对猎物的消耗

水体中浊度(悬浮颗粒)的人为增加会改变水下视觉环境,导致暴露在这些条件下的鱼类的视觉信号中断。然而,不同的浊度类型(例如沉积或藻类颗粒)预计会以不同的方式影响视觉环境,因为它们表现出不同的物理特性。本研究的主要目的是确定浊度升高对翡翠光泽(Notropis atherinoides)猎物消耗的影响。第二个目标是确定不同视觉环境中视觉形态结构(即眼睛和大脑视叶)与猎物消耗之间的关系。我们在三种浊度类型(沉积物、藻和沉积 + 藻)在两个不同的水平(20 NTU 和 40 NTU)以及在一个清晰的(<5 NTU)控制中。我们发现,相对于对照处理,不同浊度类型的高浊度 (40 NTU) 的猎物消耗量减少。此外,除了中等 (20 NTU) 沉积浊度处理之外,每个处理的消耗量都低于对照。这项研究表明,对于祖母绿发光体来说,虽然高水平的浊度可能会抑制觅食,但中等水平的沉积浊度可能对觅食成功略有好处。此外,通过培养富营养化导致藻类浊度增加可能会导致猎物消耗量减少。我们发现,相对于对照处理,不同浊度类型的高浊度 (40 NTU) 的猎物消耗量减少。此外,除了中等 (20 NTU) 沉积浊度处理之外,每个处理的消耗量都低于对照。这项研究表明,对于祖母绿发光体来说,虽然高水平的浊度可能会抑制觅食,但中等水平的沉积浊度可能对觅食成功略有好处。此外,通过培养富营养化导致藻类浊度增加可能会导致猎物消耗量减少。我们发现,相对于对照处理,不同浊度类型的高浊度 (40 NTU) 的猎物消耗量减少。此外,除了中等 (20 NTU) 沉积浊度处理之外,每个处理的消耗量都低于对照。这项研究表明,对于祖母绿发光体来说,虽然高水平的浊度可能会抑制觅食,但中等水平的沉积浊度可能对觅食成功略有好处。此外,通过培养富营养化导致藻类浊度增加可能会导致猎物消耗量减少。这项研究表明,对于祖母绿发光体来说,虽然高水平的浊度可能会抑制觅食,但中等水平的沉积浊度可能对觅食成功略有好处。此外,通过培养富营养化导致藻类浊度增加可能会导致猎物消耗量减少。这项研究表明,对于祖母绿发光体来说,虽然高水平的浊度可能会抑制觅食,但中等水平的沉积浊度可能对觅食成功略有好处。此外,通过培养富营养化导致藻类浊度增加可能会导致猎物消耗量减少。
更新日期:2019-11-12
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