Summary
This field study integrates stable isotope analysis and stoichiometric approaches to examine how soil detritivore (millipede) niches shift along an altitudinal gradient in northeastern China. The authors demonstrate that millipede trophic position and resource use vary significantly with elevation, with calcium concentration and stoichiometric mismatches between millipedes and litter playing key roles in determining trophic niche allocation. The findings suggest that combining isotopic and stoichiometric methods offers a robust approach for understanding belowground food web complexity and species-level functional responses to environmental gradients.
UK applicability
Whilst this study was conducted on a specific Chinese mountain system, the methodological framework combining stable isotopes with stoichiometry may be applicable to UK soil fauna studies examining detritivore responses to elevation or climate variation. However, UK detritivore communities, litter chemistries, and environmental conditions differ substantially, so direct transfer of findings would require UK-specific validation.
Key measures
Stable isotope ratios (δ15N, δ13C); element concentrations (calcium, nitrogen, carbon); stoichiometric characteristics; litter-calibrated isotope values; trophic position indices
Outcomes reported
The study measured stable isotope ratios (15N and 13C) and stoichiometric characteristics of five millipede taxonomic groups across an 800–1850 m altitudinal gradient to determine how trophic niche and nutritional status vary with elevation. It quantified element concentrations in millipedes and litter resources to assess stoichiometric mismatches and their relationship to resource use and trophic position.
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