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Evolution: Poison frogs changing colors while island hopping.

Andres Bendesky¹

¹Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY 10027, USA; Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY 10027, USA.

Current Biology : CB

|March 24, 2026

Summary

This summary is machine-generated.

Poison frogs typically have uniform warning signals, but strawberry poison frogs in Panama show surprising variation. This study investigates the evolutionary paradox of signal diversity in aposematic species.

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Area of Science:

Evolutionary biology
Ecology
Animal signaling

Background:

Aposematic species, or those with warning signals, are predicted to have low signal variation.
This prediction is based on the idea that consistent signals benefit predator learning.
Strawberry poison frogs in Bocas del Toro, Panama, present a challenge to this theory due to observed signal diversity.

Purpose of the Study:

To investigate the evolutionary paradox of signal variation in strawberry poison frogs.
To understand the ecological and genetic factors contributing to signal diversity in this species.
To test predictions of evolutionary theory regarding warning signal consistency.

Main Methods:

Field observations of strawberry poison frogs in Bocas del Toro, Panama.
Spectrophotometric analysis of frog coloration.
Behavioral experiments to assess predator responses to different color morphs.
Genetic analysis to investigate population structure and gene flow.

Main Results:

Significant variation in warning signal coloration was observed among strawberry poison frog populations.
Color variation did not appear to impede predator learning or avoidance.
Preliminary genetic data suggest localized adaptation and limited gene flow contributing to distinct morphs.

Conclusions:

The observed signal variation in strawberry poison frogs challenges traditional evolutionary predictions for aposematic species.
Ecological factors, such as habitat heterogeneity or specific predator-prey dynamics, may drive signal diversification.
Further research is needed to fully elucidate the evolutionary mechanisms maintaining color polymorphism in this species.