The use of plant, bacterial and fungal resources in soil food webs of ecto- and arbuscular mycorrhiza-dominated deciduous forests

Soil food webs, driven by complex interactions among plants, microbes, and invertebrates, are crucial for carbon and nutrient cycling in forest ecosystems. Over the last decade, it has become evident that forests dominated by arbuscular mycorrhizal fungi (AMF) or ectomycorrhizal fungi (EMF) differ in their litter chemistry and microbial community composition, leading to different carbon and nutrient cycling. Still, the role of soil invertebrates in soil food webs of AMF- and EMF-dominated forests remains undescribed. Here, we tested whether trophic positions (TP) and basal resources of nine soil invertebrate groups (Araneae, Chilopoda, Collembola, Diplopoda, Diptera, Isopoda, Lumbricina, Mesostigmata, and Oribatida) are different in AMF- (maple and/or ash) and EMF-dominated (beech and/or oak) deciduous forests. We addressed this question using compound-specific stable isotope analysis of carbon and nitrogen in amino acids (CSIA-AA) – a novel method that allows precise estimation of the ..., , # The use of plant, bacterial and fungal resources in soil food webs of ecto- and arbuscular mycorrhiza-dominated deciduous forests

Dataset DOI: [10.5061/dryad.0rxwdbsd1](10.5061/dryad.0rxwdbsd1)

## Description of the data and file structure

Data was collected to analyze the use of different basal resources and trophic position of nine soil invertebrate species using compound-specific isotope analysis of amino acids

Datasets included:

(1) AA_discrimination_4EAA

(2) consumer_MixSIAR-4EAA_norm

(3) Training_4EAA_MixSIAR

(4) training_data

(5) TP_measurements

### Files and variables

#### (1) AA_discrimination_4EAA.xlsx

**Description**: We assume direct routing, so all discrimination factors were set to 0 (see Manlick & Newsome, 2022). A file is needed for mixing models.

**Variables**:

**source** - Basal resources of bacteria, fungi, and plants
**MeanLeu** - Mean discrimination factor for leucine
**SDLeu** - Standard deviations of the discrimination for leucine
**MeanMet** - Mea...,