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首页> 外文期刊>ICES Journal of Marine Science >How trophic cascades and photic zone nutrient content interact to generate basin-scale differences in the microbial food web
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How trophic cascades and photic zone nutrient content interact to generate basin-scale differences in the microbial food web

机译：级联级联和光区营养含量如何相互作用，以产生微生物食品网的盆地差异

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摘要

In linear food chains, resource and predator control produce positive and negative correlations, respectively, between biomass at adjacent trophic levels. These simple relationships become more complex in food webs that contain alternative food chains of unequal lengths. We have used a "minimum" model for the microbial part of the pelagic food web that has three such food chains connecting free mineral nutrients to copepods: via diatoms, autotrophic flagellates, and heterotrophic bacteria. Trophic cascades from copepods strongly modulates the balance between the three pathways and, therefore, the functionality of the microbial food web in services such as food production for higher trophic levels, DOM degradation, and ocean carbon sequestration. The result is a theoretical framework able to explain, not only apparent conflicts in Arctic mesocosm experiments, but also biogeochemical features of the Mediterranean. Here, the fundamental difference between Arctic and Mediterranean microbial food webs is the way they are predator driven by seasonal migration of large copepods in the Arctic, but resource driven due to the anti-estuarine circulation in the Mediterranean. In this framework, global change effects on microbial ecosystem functions are more like to come indirectly through changes in these drivers than through direct temperature effects on the microbes.
机译：在线性食物链中，资源和捕食者控制分别在相邻营养水平的生物质之间产生正相关和负相关性。这些简单的关系在含有不等长度的替代食物链的食物网中变得更加复杂。我们已经使用了一种“最小”模型，用于骨质类食物网的微生物部分，这些模型具有三个这样的食物链，将自由矿物质与桡足类药物连接到桡足类：通过硅藻，自身营养鞭毛和异养细菌。来自Copepods的营养级联强烈调节三种途径之间的平衡，因此，诸如食物生产中的微生物食品网的功能，例如较高的营养水平，DOM降解和海洋碳封存。结果是能够解释的理论框架，不仅是北极中科姆实验中明显的冲突，而且是地中海的生物地球化学特征。在这里，北极和地中海微生物食物网之间的根本差异是它们是北极地区大型桡足类的季节性迁移驱动的捕食者的方式，而是由于地中海的抗偏卤素循环导致的资源驱动。在本框架中，对微生物生态系统功能的全局变化效应更像是通过这些驱动程序的变化间接来通过直接温度效应对微生物的影响。

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