Stable isotopes of amino acids indicate that soil decomposer microarthropods predominantly feed on saprotrophic fungi
Stable isotopes of amino acids indicate that soil decomposer microarthropods predominantly feed on saprotrophic fungi
复制标题
氨基酸的稳定同位素表明土壤分解微型节肢动物主要以腐生真菌为食
DOI：
10.1002/ecs2.3425
复制
发表时间：
2021
期刊：
影响因子：
2.7
通讯作者：
Pollierer
中科院分区：
文献类型：
--
作者：
Pollierer
土壤微型节肢动物对于森林生态系统的养分循环至关重要，因为它们是分解者食物网的组成部分。它们将碳和养分从落叶层和根部输送到更高的营养层；然而，人们对不同渠道的相对重要性及其随森林类型的变化缺乏了解。尽管人们越来越认识到根部来源的输入对于维持土壤食物网的重要性，但人们对它们输送到更高营养水平的途径知之甚少。对于通道，外生菌根真菌可能发挥重要作用，但到目前为止，还缺乏能够区分外生菌根真菌和腐生真菌对土壤动物群落营养的贡献的方法。通过对氨基酸 (AA) 中 15N 和 13C 的双重分析，我们研究了德国山毛榉和云杉林中两个主要土壤微型节肢动物类群——弹尾目和甲节目——的营养位置和基础资源。通过应用 13C 指纹识别方法和贝叶斯混合模型，我们第一步分离了细菌、真菌和植物对土壤微型节肢动物营养的相对贡献。由于真菌被确定为主要食物来源，在第二步中，我们尝试区分外生菌根真菌与腐生真菌的贡献。我们首次提供直接证据表明土壤微型节肢动物主要依赖腐生真菌，而外生菌根真菌仅被少数物种消耗。虽然山毛榉林和云杉林之间弹虫和Oribatida物种的营养生态位一般差异不大，但作为土壤微型节肢动物基础资源的植物碎屑在山毛榉林中更为重要，而在云杉林中微生物资源占主导地位。总体而言，对AA中碳和氮的双重分析以前所未有的细节深入了解土壤微型节肢动物的食物网结构，并首次能够估计菌根和腐生真菌对土壤食物网营养的相对重要性，这是土壤食物网生态学中长期存在的谜团。该技术为全面了解土壤食物网的营养结构和能量通道提供了视角。
Soil microarthropods are essential for nutrient cycling in forest ecosystems as they are integral components of decomposer food webs. They channel carbon and nutrients from leaf litter and roots to higher trophic levels; however, knowledge on the relative importance of different channels and on their variation with forest type is lacking. Although the importance of root‐derived inputs for sustaining soil food webs is increasingly recognized, the pathways by which they are channeled to higher trophic levels are little understood. For the channeling, ectomycorrhizal fungi may play a significant role, but until now methods allowing to separate the contribution of ectomycorrhizal and saprotrophic fungi to the nutrition of soil animal communities are lacking. Using dual analysis of15N and13C in amino acids (AAs), we investigated trophic positions and basal resources of two major groups of soil microarthropods, Collembola and Oribatida, in beech and spruce forests in Germany. By applying a13C fingerprinting approach and Bayesian mixing models, we separated in a first step the relative contribution of bacteria, fungi, and plants to the nutrition of soil microarthropods. As fungi were identified as the major food source, in a second step we attempted to separate the contribution of ectomycorrhizal vs. saprotrophic fungi. For the first time, we provide direct evidence that soil microarthropods mainly rely on saprotrophic fungi, whereas ectomycorrhizal fungi are consumed by only few species. While trophic niches of Collembola and Oribatida species generally varied little between beech and spruce forests, plant detritus as basal resource of soil microarthropods was somewhat more important in beech forests, whereas in spruce forests microbial resources dominated. Overall, the dual analysis of carbon and nitrogen in AAs provided insight into food web structure of soil microarthropods in unprecedented detail, and for the first time allowed to estimate the relative importance of mycorrhizal and saprotrophic fungi for soil food web nutrition, a long‐standing riddle in soil food web ecology. The technique provides the perspective for a comprehensive understanding of the trophic structure and energy channeling in soil food webs.
登录
查看更多内容
影响因子：
3.7
作者：
Steffan SA;Chikaraishi Y;Horton DR;Ohkouchi N;Singleton ME;Miliczky E;Hogg DB;Jones VP
通讯作者：
Jones VP
影响因子：
9.7
作者：
Pollierer, Melanie M.;Ferlian, Olga;Scheu, Stefan
通讯作者：
Scheu, Stefan
影响因子：
3.6
作者：
Julia Moll;K. Goldmann;S. Kramer;Stefan Hempel;E. Kandeler;S. Marhan;Liliane Ruess;D. Krüger;F. Buscot
通讯作者：
Julia Moll;K. Goldmann;S. Kramer;Stefan Hempel;E. Kandeler;S. Marhan;Liliane Ruess;D. Krüger;F. Buscot
影响因子：
5.2
作者：
J. Pausch;S. Kramer;Anika Scharroba;Nicole Scheunemann;Olaf Butenschoen;E. Kandeler;S. Marhan;M. Riederer;S. Scheu;Y. Kuzyakov;Liliane Ruess
通讯作者：
J. Pausch;S. Kramer;Anika Scharroba;Nicole Scheunemann;Olaf Butenschoen;E. Kandeler;S. Marhan;M. Riederer;S. Scheu;Y. Kuzyakov;Liliane Ruess
影响因子：
3.7
作者：
Zieger SL;Ammerschubert S;Polle A;Scheu S
通讯作者：
Scheu S