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How repeatable is CT_max within individual brook trout over short- and long-time intervals?

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Journal of Thermal Biology

|May 5, 2020

Summary

This summary is machine-generated.

Critical thermal maximum (CTmax) is a repeatable metric for assessing fish thermal tolerance. This study confirmed CTmax

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Area of Science:

Aquatic Ecology
Fish Physiology
Climate Change Biology

Background:

Rising stream temperatures threaten cold-water fish populations.
Understanding thermal tolerance is crucial for predicting species adaptation.
Critical thermal maximum (CTmax) is a common but often unvalidated measure of thermal tolerance.

Purpose of the Study:

To assess the repeatability of CTmax as a metric for thermal tolerance in brook trout.
To determine if CTmax is a consistent measure within individual fish over time.

Main Methods:

Individually marked adult brook trout (Salvelinus fontinalis) were held in a laboratory setting.
CTmax was measured three times for each fish over a period of approximately one year.
Repeatability of CTmax measurements within individuals was statistically analyzed.

Main Results:

CTmax was found to be a repeatable trait in brook trout (Repeatability ± S.E.: 0.48 ± 0.14).
Individual male brook trout exhibited consistent CTmax values over time.
Female brook trout showed a slight increase in CTmax over the study period.

Conclusions:

CTmax is a robust and repeatable metric for estimating thermal tolerance in brook trout.
This finding supports the use of CTmax in studies investigating fish adaptation to warming waters.
Repeatability of CTmax is essential for reliable predictions of climate change impacts on fish populations.