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Resource depletion affects the structure of an experimental benthic food web

机译：资源枯竭会影响实验性底栖食物网的结构

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In this study, we investigated the long-term (2-year) response of a detritus-based food web to resource depletion simulated in microcosms filled with lake sediment. The effects of resource depletion on the food web were estimated from the biomass responses of a simplified, size-based trophic network comprising three trophic levels: (1) bacteria, (2) bacterivorous meiofauna, and (3) omnivore/predacious nematodes and oligochaetes. The results showed that sediment bacteria and organic carbon stock were not affected by resource depletion, whereas oligochaetes, large nematodes and some bacterivores, such as rotifers and ostracods, decreased dramatically. At the same time, resource depletion had no negative effect on minute bacterivorous nematodes and harpacticoid copepods, suggesting their release from competition with other bacterivores and/or their release from potential predation by large nematodes and oligochaetes. Our results globally confirmed classical trophic dynamics models in which a shortage in resources dampens food-chain length. Yet, low resources did not completely eliminate all large invertebrates, and did not affect the standing stock of detritus and bacteria, suggesting that detritus-based food webs could show a remarkable resilience to the effects of resource depletion. (C) 2016 Elsevier GmbH. All rights reserved.
机译：在这项研究中，我们调查了基于碎屑的食物网对在充满湖泊沉积物的微观世界中模拟的资源枯竭的长期（2年）响应。资源消耗对食物网的影响是通过简化的基于大小的营养网络（包括三个营养级别）的生物量响应来估算的：三个营养级别：（1）细菌，（2）食细菌性食肉动物和（3）杂食性/捕食性线虫和寡食动物。结果表明，沉积物细菌和有机碳库不受资源枯竭的影响，而寡头类，大型线虫和一些噬菌体（如轮虫和成虫）则急剧减少。同时，资源枯竭对微小的细菌线虫和类立足类co足类动物没有负面影响，表明它们从与其他噬菌体竞争中释放出来和/或它们从大型线虫和寡食动物的潜在捕食中释放出来。我们的研究结果在全球范围内证实了经典的营养动力学模型，在该模型中，资源短缺会抑制食物链的长度。然而，资源不足并不能完全消除所有大型无脊椎动物，也不会影响碎屑和细菌的存量，这表明基于碎屑的食物网可以显示出对资源枯竭影响的显着适应力。 （C）2016 Elsevier GmbH。版权所有。

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