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Related Experiment Video

Updated: Jul 11, 2026

High-Throughput Assays of Critical Thermal Limits in Insects

High-Throughput Assays of Critical Thermal Limits in Insects

Published on: June 15, 2020

Critical thermal limits depend on methodological context.

John S Terblanche¹, Jacques A Deere, Susana Clusella-Trullas

¹Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, Republic of South Africa. jst@sun.ac.za

Proceedings. Biological Sciences

|September 20, 2007

Summary

This summary is machine-generated.

Tsetse flies (Glossina pallidipes) show reduced thermal tolerance with slower temperature changes, impacting their predicted distribution. Their functional thermal range may be narrower than expected, around 20-40°C.

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Area of Science:

Zoology
Ecology
Physiology

Background:

Understanding critical thermal limits (CTLs) is crucial for predicting species distribution and survival.
The tsetse fly (Glossina pallidipes) is a significant vector of trypanosomiasis in Africa.

Purpose of the Study:

To investigate the effects of temperature change rates and start temperatures on the upper and lower CTLs of Glossina pallidipes.
To determine the ecological relevance of these factors for tsetse fly distribution.

Main Methods:

A full-factorial study design was employed to test various rates of temperature change and start temperatures.
Critical thermal limits (upper and lower) were measured for Glossina pallidipes.

Main Results:

Both temperature change rates and start temperatures significantly affected CTLs.
Slower rates of temperature change (longer duration) led to decreased thermal tolerance.
Ecologically relevant conditions indicated a narrower functional thermal range (approx. 20-40°C) for G. pallidipes.

Conclusions:

The functional thermal range of G. pallidipes may be narrower than previously assumed, highlighting their sensitivity to temperature fluctuations.
Limited plasticity of CTLs over short timescales explains these findings.
Results have broad implications for understanding temperature tolerance in terrestrial arthropods and predicting tsetse fly distribution.