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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Context-dependent indirect effects mediate ecological transitions between parasitism and mutualism
Yu-Hsuan Lee1,2, Wei-Jiun Lin3, Mu-Tzu Tsai1
1International Degree Program in Climate Change and Sustainable Development, National Taiwan University, Taipei, Taiwan.
Communications Biology
|March 31, 2026
Summary
Mites protect burying beetles from harmful nematodes, improving offspring survival. However, mites can harm beetles without nematodes, showing complex symbiotic relationships are context-dependent.
Area of Science:
- Ecology
- Evolutionary Biology
- Microbiology
Background:
- Symbiotic interactions exist on a mutualism-parasitism spectrum.
- Ecological context influences host fitness and microbial communities.
Purpose of the Study:
- To investigate the interactions between phoretic mites (Poecilochirus carabi), nematodes (Rhomborhabditis regina), and burying beetles (Nicrophorus nepalensis).
- To understand how these interactions affect host fitness and the associated microbiome.
Main Methods:
- Field surveys
- Reciprocal breeding experiments
- Feeding assays
- Microbiome profiling
Main Results:
- High nematode densities negatively impact beetle offspring survival.
- Mites mitigate nematode-induced costs by preying on nematodes and reducing vertical transmission.
- Mites and nematodes both reduce bacterial loads on carrion, but mites cause more significant microbiome shifts.
- Interactions between mites and nematodes amplify changes in bacterial communities.
- Mites impose fitness costs on beetles in the absence of nematodes.
Conclusions:
- The net effect of mites on beetle fitness is determined by indirect interactions with nematodes and microbial competitors.
- Phoresy actively restructures host-symbiont networks, emphasizing the role of indirect effects in multisymbiotic systems.
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