Mites reveal a survival cost of reproduction in beetles
A laboratory experiment linked larger broods to higher mortality risk in female burying beetles breeding with mites, but not in unexposed females.
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Mechanisms- Studied:
- Experiments in female burying beetles, until death
- What changed:
- Larger broods were linked to higher mortality risk in females breeding with mites, but lower risk in controls
- The catch:
- Survival analysis excluded females that produced no surviving larvae
Editor of record: Boris Djordjevic · AgingResearch.News
In a laboratory experiment, female burying beetles (Nicrophorus nepalensis) bred without mites, after brief mite exposure, or with mites present during breeding. Researchers compared sibling beetles across groups to control for genetic background. The groups included 74 unexposed females, 73 briefly exposed females and 79 females breeding with mites. Brief exposure involved 10 mites for 24 hours before removal.
Both exposed groups produced larger broods than controls, with matching brood sizes. Among females that bred with mites, larger broods were associated with higher mortality risk. In controls, larger broods were associated with lower mortality risk. The brief-exposure group showed no clear link. Researchers removed all remaining mites after larvae dispersed, then monitored female survival until death.
Why it matters
The relationship between reproductive effort and maintaining the body is a key question in understanding lifespan. The study examined how interactions with another species can shape that balance.
Caveats
The survival analysis excluded females that produced no surviving larvae, and researchers did not experimentally assign brood size. The findings came from laboratory-reared beetles.
The paper
Symbionts unmask the latent trade-off between reproduction and survival
National Taiwan University
iScience, Jul 1, 2026, Open access
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