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Local and Global Methods of Assessing Thermal Nociception in Drosophila Larvae

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Published on: May 18, 2012

Self-heating by large insect larvae?

Nikita L Cooley¹, Douglas J Emlen¹, H Arthur Woods¹

¹Division of Biological Sciences, 32 Campus Drive HS104, University of Montana, Missoula, MT, 59812, USA.

Journal of Thermal Biology

|November 15, 2016

Summary

This summary is machine-generated.

Insect larvae metabolism generates minimal self-heating, with large Japanese rhinoceros beetle larvae experiencing less than a 2°C rise. Behavioral thermoregulation is key for underground insects.

Keywords:

Behavioral thermoregulation Body size Critical thermal maxima Gigantism Heat balance Metabolic heat Soil

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Area of Science:

Insect physiology
Metabolic heat production
Thermoregulation

Background:

Investigating the potential for insect larvae to generate significant metabolic heat.
Understanding the influence of environmental temperature and body size on insect self-heating.

Purpose of the Study:

To determine if insect larvae self-heat significantly from metabolic activity.
To identify environmental conditions and body sizes influencing larval self-heating.

Main Methods:

Utilized CO2 respirometry to measure metabolic rates in Japanese rhinoceros beetle larvae (Trypoxylus dichotomus).
Converted gas exchange rates to heat production rates.
Developed a mathematical model to predict body temperature increases above ambient based on body size.

Main Results:

Large extant larvae (20-30g) exhibited a maximum self-heating of 2°C, typically less than 1°C in common soil conditions.
A model predicted hypothetical insects >1kg could self-heat by 1.5-6°C in warm, dry soils.
Larval critical thermal maxima exceeded 43.5°C, and behavioral thermoregulation was observed.

Conclusions:

Metabolic self-heating contributes minimally to the heat budgets of large, underground larvae under most conditions.
Behavioral thermoregulation is the primary mechanism for temperature regulation in these insects.
Significant self-heating is possible only for much larger, hypothetical insect masses under specific environmental conditions.