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Interplay between behavioural thermoregulation and immune response in mealworms
Tamara P Catalán1, Hermann M Niemeyer, Alexis M Kalergis
1Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 6513677, Chile. tpcatala@uc.cl
Journal of Insect Physiology
|September 19, 2012
Summary
Mealworm larvae increase their preferred body temperature when facing bacterial challenges, a phenomenon known as behavioral fever. This elevated temperature enhances their antibacterial immune response, particularly when pathogen levels are low.
Area of Science:
- Animal behavior
- Immunology
- Physiology
Background:
- Behavioral fever, the elevation of body temperature in response to infection, is hypothesized to enhance immune function.
- Understanding the relationship between preferred body temperature and immune performance is crucial for comprehending host defense mechanisms.
Purpose of the Study:
- To investigate the preferred body temperature (T(p)) of Tenebrio molitor larvae after an immune challenge with varying concentrations of lipopolysaccharide (LPS).
- To determine the correlation between T(p) and key immune responses, specifically antibacterial activity and phenoloxidase (PO) activity.
Main Methods:
- Larvae of Tenebrio molitor were exposed to different concentrations of LPS to simulate an immune challenge.
- The preferred body temperature (T(p)) of larvae was measured.
- Antibacterial activity and phenoloxidase (PO) activity were quantified as measures of immune response.
Main Results:
- Larvae exposed to higher LPS concentrations exhibited a significantly higher T(p) compared to control groups.
- A positive correlation was observed between T(p) and antibacterial activity at lower LPS concentrations.
- PO activity increased with higher LPS concentrations, but this response did not correlate with T(p).
Conclusions:
- Behavioral fever in Tenebrio molitor larvae can positively influence host performance by boosting antibacterial responses, especially under conditions of low pathogen load.
- The findings suggest that thermoregulation plays a role in adaptive immunity in insects.
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