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Complex mating system and dispersal patterns in a social lizard, Egernia whitii
David G Chapple1, J Scott Keogh
1School of Botany and Zoology, Australian National University, Canberra ACT 0200, Australia. david.chapple@vuw.ac.nz
Molecular Ecology
|March 19, 2005
Summary
Most Australian skinks exhibit polygyny, but White's skink (Egernia whitii) shows widespread social and genetic monogamy within its social groups. This study reveals a mixed mating system with a notable incidence of monogamy in this reptile species.
Area of Science:
- Behavioral Ecology
- Molecular Ecology
- Herpetology
Background:
- Most reptiles display polygynous mating systems.
- The Australian Egernia group of skinks is known for group-living and potential monogamy.
- Previous research indicated White's skink (Egernia whitii) forms stable social aggregations.
Purpose of the Study:
- To investigate the mating system, spatial organization, and dispersal patterns of Egernia whitii.
- To determine the prevalence of monogamy and polygyny in E. whitii.
- To analyze genetic relatedness and population structure within E. whitii social groups.
Main Methods:
- Behavioral field observations were conducted.
- Microsatellite DNA markers were used for parentage and genetic analyses.
- Spatial autocorrelation and assignment tests were employed to assess genetic structure and dispersal.
Main Results:
- The mating system of E. whitii is characterized by both polygyny and monogamy, with within-season monogamy common (36-45%).
- Low levels of multiple paternity (12%) and extra-group paternity (16%) were observed.
- Significant local genetic structure was detected up to 50 m, with ambiguous evidence for sex-biased dispersal.
Conclusions:
- Egernia whitii exhibits a mixed mating system, deviating from typical reptilian polygyny.
- The findings contribute to understanding the evolutionary factors promoting monogamy in the Egernia group.
- Further research is needed to clarify dispersal patterns and the drivers of monogamy in this species.
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