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首页> 外文期刊>Southeastern naturalist >Phytoplankton Prey Selection by Hypophthalmichthys molitrix Val. (Silver Carp) in a Lower Mississippi River Backwater Lake
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Phytoplankton Prey Selection by Hypophthalmichthys molitrix Val. (Silver Carp) in a Lower Mississippi River Backwater Lake

机译：Phytoplankton猎物选择由次耳疗法莫尔替斯瓦尔。 （银色鲤鱼）在较低的密西西比河回水湖

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摘要

Hypophthalmichthys molitrix (Silver Carp) are invasive and abundant in the Mississippi River system, where they consume phytoplankton. There is concern that Silver Carp may influence phytoplankton community structure with cascading effects on other trophic levels. Information is needed regarding Silver Carp phytoplankton-consumption rates and prey selection to assess their potential impact on the food-web in the river. We investigated Silver Carp diets in a backwater lake of the Lower Mississippi River in order to quantify phytoplankton prey selectivity. We made measurements on 4 dates over a 2-y period, which spanned a range of hydrologic connectivity between the lake and the river and a variety of fish sizes. We quantified selection by comparing phytoplankton community composition in the lake to prey in foreguts of captured Silver Carp using Vanderploeg and Scavia's (1979) relativized selection index. With a possible exception of diatoms on 1 date, there was no relationship of sample date or fish size on prey selection. However, there was a consistent pattern in prey selection: euglenoid algae were positively selected, selection of colonial algae and diatoms was variable, and flagellates and filamentous cyanobacteria were negatively selected. Results are discussed in the context of a conceptual model for Silver Carp phytoplanktivory that incorporates the roles of habitat selection, prey availability, prey capture and processing, and digestive physiology.
机译：次耳疗法莫里斯（银鲤鱼）在密西西比河系统中侵入性，丰富，在那里他们消耗浮游植物。担心银鲤鱼可能会影响浮游植物群落结构，对其他营养水平的级联影响。关于银鲤鱼浮游植物消费率和猎物选择所需的信息，以评估其对河流中食品网的潜在影响。我们调查了在小密西西比河的后水湖中的银鲤鱼饮食，以定量浮游植物猎物选择性。我们在2岁的时间内进行了测量，这是在2年的时间内进行的，跨越湖泊和河流之间的一系列水文连接以及各种鱼类尺寸。我们通过将湖泊群岛组成与捕获的银鲤掌使用VanderPloeg和Scavia（1979）相等的选择指数将浮游植物群落组成与捕获的捕获银鲤鱼进行捕食来量化选择。在1个日期可能会出现硅藻，在猎物选择上没有样品日期或鱼鳞的关系。然而，在掠夺性选择中存在一致的模式：阳性选择外蛋白藻类，殖民藻类和硅藻的选择是可变的，并且鞭毛酸盐和丝状细胞被否定。结果是在银色植物植物植物植物植物植物植物植物的概念模型的背景下讨论，其中包含栖息地选择，猎物可用性，猎物捕获和处理以及消化生理学的作用。

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