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首页> 外文期刊>Ecological research >Cascading predator control interacts with productivity to determine the trophic level of biomass accumulation in a benthic food web
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Cascading predator control interacts with productivity to determine the trophic level of biomass accumulation in a benthic food web

机译：级联捕食者控制与生产力相互作用，以确定底栖食物网中生物质积累的营养水平

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摘要

Large-scale exploitation of higher trophic levels by humans, together with global-scale nutrient enrichment, highlights the need to explore interactions between predator loss and resource availability. The hypothesis of exploitation ecosystems suggests that topdown and bottom-up control alternate between trophic levels, resulting in a positive relationship between primary production and the abundance of every second trophic level. Specifically, in food webs with three effective trophic levels, primary producers and predators should increase with primary production, while in food webs with two trophic levels, only herbivores should increase. We provided short-term experimental support for these model predictions in a natural benthic community with three effective trophic levels, where the number of algal recruits, but not the biomass of gastropod grazers, increased with algal production. In contrast, when the food web was reduced to two trophic levels by removing larger predators, the number of algal recruits was unchanged while gastropod grazer biomass increased with algal production. Predator removal only affected the consumer-controlled early life-stages of algae, indicating that both the number of trophic levels and the life-stage development of the producer trophic level determine the propagation of trophic cascades in benthic systems. Our results support the hypothesis that predators interact with resource availability to determine food-web structure.
机译：人类对更高营养水平的大规模开发以及全球范围内的营养富集，凸显了探索捕食者损失与资源可利用性之间相互作用的必要性。剥削生态系统的假设表明，自上而下和自下而上的控制在营养级别之间交替，从而导致初级生产与每两个营养级别的丰度之间存在正相关关系。具体而言，在具有三个有效营养水平的食物网中，初级生产者和捕食者应随着初级生产而增加，而在具有两个营养水平的食物网中，仅食草动物应增加。我们在具有三个有效营养水平的天然底栖生物群落中为这些模型预测提供了短期实验支持，其中藻类新生的数量随腹藻产量的增加而增加，但腹足纲食草动物的生物量却没有增加。相反，当通过移除较大的捕食者而将食物网减少到两个营养级时，藻类新兵的数量没有变化，而腹足纲掠食者的生物量随藻类产量的增加而增加。捕食者的去除仅影响消费者控制的藻类的早期生命阶段，这表明营养水平的数量和生产者营养水平的生命阶段发展都决定了营养级联在底栖系统中的传播。我们的研究结果支持了掠食者与资源可用性相互作用以确定食物网结构的假说。

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  • 来源
    《Ecological research》 |2012年第1期|p.203-210|共8页
  • 作者

    Britas Klemens Eriksson; Anja Rubach; Jurgen Batsleer; Helmut Hillebrand;

  • 作者单位

    Department of Marine Benthic Ecology and Evolution, Center for Ecological and Evolutionary Sciences, Biological Center, University of Groningen, P.O. Box 11103, 9700 CC Groningen, The Netherlands;

    Department of Ecology and Environmental Science, Umea University, Umea, Sweden;

    Department of Marine Benthic Ecology and Evolution, Center for Ecological and Evolutionary Sciences, Biological Center, University of Groningen, P.O. Box 11103, 9700 CC Groningen, The Netherlands;

    Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Wilhelmshaven, Germany;

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  • 正文语种 eng
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  • 关键词

    interaction between top-down bottom-up control; trophic cascade; benthic food-web; marine eutrophication; baltic sea;

    机译：自上而下;自下而上的控件之间的交互;营养级联底栖食物网海洋富营养化波罗的海;

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