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Related Experiment Video

Updated: May 18, 2026

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Published on: December 14, 2006

Testing hypotheses for genealogical discordance in a rainforest lizard.

Sonal Singhal¹, Craig Moritz

¹Museum of Vertebrate Zoology, University of California, Berkeley, CA 94720-3160, USA. singhal@berkeley.edu

Molecular Ecology

|September 20, 2012

Summary

Gene flow between species, known as introgression, can create conflicting genetic histories. This study reveals introgression likely caused deep mitochondrial-nuclear discordance in Australian lizards.

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Area of Science:

Evolutionary Biology
Genetics
Zoology

Background:

Genealogical discordance occurs when genetic markers show different evolutionary histories.
This phenomenon can arise from random genetic drift (coalescent stochasticity) or gene flow between species (introgression).
Understanding the drivers of discordance is crucial for accurate species delimitation and evolutionary inference.

Purpose of the Study:

To investigate the causes of mito-nuclear genealogical discordance in the Australian rainforest lizard species complex Saproscincus basiliscus and S. lewisi.
To test hypotheses involving coalescent variance and introgression as explanations for observed genetic divergence patterns.
To provide a framework for analyzing genealogical discordance in other species.

Main Methods:

Utilized multilocus sequence data to reconstruct evolutionary histories.
Employed coalescent-based approximate Bayesian computation (ABC) methods to infer demographic histories.
Compared mitochondrial and nuclear genome divergence patterns within the Saproscincus species complex.

Main Results:

Identified significant mito-nuclear genealogical discordance in the Southern S. basiliscus lineage.
The mitochondrial genome showed deep divergence, while the nuclear genome exhibited much lower divergence.
Analyses strongly suggested introgression, rather than solely coalescent stochasticity, as the primary driver of this discordance.

Conclusions:

Historical introgression, potentially combined with factors like selection or sex-biased dispersal, likely generated the observed deep mito-nuclear discordance.
Introgression can be a significant evolutionary force shaping genetic diversity and population structure.
The study provides a robust framework for identifying and testing the causes of genealogical discordance in various taxa.