The Keystone Role of Heterotrophic Microbes in Driving Ecosystem-level Effects of Nutrient Enrichment

异养微生物在驱动营养丰富的生态系统层面效应中的关键作用A·D·罗斯蒙德、J·B·华莱士、K·苏伯克罗普该项目建立在阿巴拉契亚山脉南部一条源头溪流之前添加的营养物质的基础上。这一添加导致陆源有机物的快速分解，提高了微生物产量，特别是真菌，并提高了无脊椎动物的生产力。这项拟议的研究旨在区分基于碎屑的系统中真菌和细菌的相对重要性。我们将继续添加营养物质，并通过在处理流中添加杀菌剂来消除微生物群落中的真菌成分。通过大幅减少真菌，我们将评估它们对生态系统过程的重要性，如凋落物分解、总微生物生产和呼吸、无脊椎动物次级生产、悬浮颗粒输出和有机质储存。我们的假设将测试以碎屑为基础的系统中真菌和细菌之间的性质和关系类型，即真菌和细菌是竞争碳和养分，还是互补？这项研究加深了我们对微生物多样性在生态系统功能中的重要性的理解。

The keystone role of heterotrophic microbes in driving ecosystem-level effects of nutrient enrichment A. D. Rosemond, J. B. Wallace, K. Suberkropp This project builds on a previous nutrient addition to a headwater stream in the southern Appalachian Mountains. This addition resulted in rapid decomposition of terrestrially derived organic matter, enhanced microbial production, especially fungi, and elevated invertebrate productivity. The proposed study is designed to separate the relative importance of fungi and bacteria in detritus-based systems. We will continue to add nutrients and eliminate the fungal component of the microbial community by adding a fungicide to the treatment stream. By greatly reducing fungi we will assess their importance to ecosystem processes such as litter decomposition, overall microbial production and respiration, invertebrate secondary production, suspended particle export, and organic matter storage. Our hypotheses will test the nature, and types of relationships between fungi and bacteria in detritus-based systems, i.e. do fungi and bacteria compete for carbon and nutrients or do they complement each other? This study adds to our understanding the importance of microbial diversity in ecosystem functions.