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Reassessing Hybrid Vigor or Hybrid Dysfunction Using Physiological Trade-Offs in an Endangered Salamander System.

Benjamin M Fitzpatrick, Evin T Carter, Lindsey E Hayter

Ecological and Evolutionary Physiology

|March 3, 2026

Summary

Hybrid tiger salamanders exhibit higher metabolic rates and water loss than parentals. This physiological difference may indicate hybrid dysfunction rather than enhanced performance, requiring further fitness studies.

Keywords:

Ambystoma californiense Ambystoma mavortium metabolic rate water loss water-gas exchange ratio

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Area of Science:

Ecology
Evolutionary Biology
Amphibian Physiology

Background:

Interspecific hybrids can exhibit varied fitness compared to parental genotypes, impacting evolution and conservation.
Previous research suggested hybrid tiger salamanders had higher performance based on metabolic rate and water loss ratios.
Genetic reclassification revealed misidentification of hybrids and parentals in prior studies.

Purpose of the Study:

To reanalyze tiger salamander hybrid performance data with corrected genetic identification.
To reassess the interpretation of metabolic rate and water loss ratios in hybrid salamanders.
To investigate whether observed physiological differences represent hybrid vigor or dysfunction.

Main Methods:

Reanalysis of existing physiological data using corrected genetic classifications of tiger salamanders (hybrid vs. parental).
Comparison of resting metabolic rate and water loss between genetically confirmed hybrids and parentals.
Evaluation of the ratio of resting metabolic rate to water loss as a performance indicator.

Main Results:

Corrected classifications confirmed hybrids have significantly higher resting metabolic rates and greater water loss than parentals.
The ratio of resting metabolic rate to water loss was also higher in hybrids.
These physiological differences challenge the interpretation of hybrid "vigor".

Conclusions:

The higher metabolic rate and water loss in hybrids may represent "hybrid dysfunction" due to increased energetic costs and desiccation risk.
The ratio of metabolic rate to water loss is proposed as a ratio of costs, not a measure of performance.
Further research is necessary to determine the actual fitness consequences of these physiological traits in hybrid tiger salamanders for evolutionary and conservation insights.