Maggot-Mass Thermogenesis
Definition
The elevation of temperature within a dense larval aggregation by the combined metabolic heat of thousands of larvae. Documented elevations range from 2 to more than 10 degrees C above ambient, accelerating development beyond ambient-temperature predictions.
- Cause
- Combined metabolic heat of larvae in a mass
- Documented range
- 2 to over 10 degrees C above ambient
- Effect
- Accelerates development beyond ambient predictions
- Practical risk
- Source of PMI estimation error if unmeasured
Common questions
How does maggot-mass thermogenesis introduce error into postmortem interval estimates?+
Standard development-rate models assume larvae experience ambient temperature, but a dense mass can run several degrees warmer, so larvae develop faster than the model predicts if the elevation is not directly measured and applied.
Is the temperature elevation from maggot-mass thermogenesis constant throughout decomposition?+
No. The elevation depends on mass size and larval density, which change as the mass grows, feeds, and eventually disperses, so a single measurement does not represent the whole colonisation period.
Related terms
- Accumulated Degree Hours (ADH)
- A temperature-corrected measure of developmental time. Calculated by summing (hourly ambient temperature minus the species-specific base temperature threshold) across the period of...
- Colonisation Interval
- The elapsed time since the first insect colonised the body. Often shorter than the PMI if access was delayed by concealment. An...
- Entomotoxicology
- The analysis of insect tissue for drugs and toxins when decomposition has made conventional biological fluids unavailable. Blow-fly larvae feeding on a...
- Minimum PMI (PMImin)
- The shortest interval consistent with the entomological evidence. In practice this is what entomologists estimate: a floor on elapsed time based on...
- Thermal Bias
- Systematic under- or over-estimation of developmental temperature caused by using distant weather-station data, solar radiation on an exposed body, or micro-environmental features...