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Related Experiment Video

Updated: Jun 3, 2026

Quantifying Abdominal Pigmentation in Drosophila melanogaster

Quantifying Abdominal Pigmentation in Drosophila melanogaster

Published on: June 1, 2017

The evolution of aposematism is accompanied by increased diversification.

Kara Przeczek¹, Carla Mueller, Steven M Vamosi

¹Department of Biological Sciences, University of Calgary, Calgary, Canada.

Integrative Zoology

|March 15, 2011

Summary

Aposematism, or warning coloration, is linked to increased species diversification in animal lineages. This study suggests that reduced predation risk from warning signals may promote the evolution and speciation of aposematic species.

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Area of Science:

Evolutionary Biology
Ecology
Zoology

Background:

Aposematism (warning coloration) is a common anti-predator adaptation.
Its macroevolutionary impact on diversification remains poorly understood.

Purpose of the Study:

To test the hypothesis that aposematism increases lineage diversification.
To investigate the relationship between warning coloration and speciation/extinction rates.

Main Methods:

Sister-group comparative analysis of aposematic and non-aposematic lineages.
Phylogenetic analysis to assess species richness differences.

Main Results:

Aposematic lineages showed increased diversification in 11 out of 14 sister-group comparisons.
Evidence supports the hypothesis that aposematism enhances diversification.

Conclusions:

The evolution of aposematism appears to be associated with higher rates of speciation or lower rates of extinction.
Despite benefits, the evolution and persistence of aposematism face challenges, including predator naivety and potential reversals.