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首页> 美国卫生研究院文献>Biology >Intraguild Predation Dynamics in a Lake Ecosystem Based on a Coupled Hydrodynamic-Ecological Model: The Example of Lake Kinneret (Israel)
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Intraguild Predation Dynamics in a Lake Ecosystem Based on a Coupled Hydrodynamic-Ecological Model: The Example of Lake Kinneret (Israel)

机译：基于耦合水动力-生态模型的湖泊生态系统内公会内捕食动力学：以金纳雷特湖为例（以色列）

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The food web of Lake Kinneret contains intraguild predation (IGP). Predatory invertebrates and planktivorous fish both feed on herbivorous zooplankton, while the planktivorous fish also feed on the predatory invertebrates. In this study, a complex mechanistic hydrodynamic-ecological model, coupled to a bioenergetics-based fish population model (DYCD-FISH), was employed with the aim of revealing IGP dynamics. The results indicate that the predation pressure of predatory zooplankton on herbivorous zooplankton varies widely, depending on the season. At the time of its annual peak, it is 10–20 times higher than the fish predation pressure. When the number of fish was significantly higher, as occurs in the lake after atypical meteorological years, the effect was a shift from a bottom-up controlled ecosystem, to the top-down control of planktivorous fish and a significant reduction of predatory and herbivorous zooplankton biomass. Yet, seasonally, the decrease in predatory-zooplankton biomass was followed by a decrease in their predation pressure on herbivorous zooplankton, leading to an increase of herbivorous zooplankton biomass to an extent similar to the base level. The analysis demonstrates the emergence of non-equilibrium IGP dynamics due to intra-annual and inter-annual changes in the physico-chemical characteristics of the lake, and suggests that IGP dynamics should be considered in food web models in order to more accurately capture mass transfer and trophic interactions.
机译：Kinneret湖的食物网包含公会内捕食（IGP）。捕食性无脊椎动物和浮游性鱼类均以草食性浮游动物为食，而浮游性鱼类也以捕食性无脊椎动物为食。在这项研究中，以揭示IGP动态为目标，采用了复杂的机械水动力-生态模型，并结合了基于生物能学的鱼类种群模型（DYCD-FISH）。结果表明，捕食性浮游动物对食草性浮游动物的捕食压力随季节变化很大。在其年度高峰时，它比鱼类捕食压力高10至20倍。当鱼类数量显着增加时（如非典型气象年后的湖中所发生的那样），其影响是从自下而上控制的生态系统转变为自上而下控制的浮游性鱼类，捕食性和草食性浮游动物显着减少生物质。然而，在季节上，捕食性浮游动物生物量减少，其捕食性浮游动物生物体的捕食压力降低，导致食草性浮游动物生物量增加到与基准水平相似的程度。该分析表明，由于湖泊的理化特征的年内和年际变化，出现了非平衡IGP动力学，并建议应在食物网模型中考虑IGP动力学，以便更准确地捕获质量。转移和营养相互作用。

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