Mass turnover and recovery dynamics of a diverse Australian continental radiation

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Brennan, IG
Oliver, PM
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2017
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Abstract

Trends in global and local climate history have been linked to observed macroevolutionary patterns across a variety of organisms. These climatic pressures may unilaterally or asymmetrically influence the evolutionary trajectory of clades. To test and compare signatures of changing global (Eocene-Oligocene boundary cooling) and continental (Miocene aridification) environments on a continental fauna, we investigated the macroevolutionary dynamics of one of Australia's most diverse endemic radiations, pygopodoid geckos. We generated a time-calibrated phylogeny (>90% taxon coverage) to test whether (i) asymmetrical pygopodoid tree shape may be the result of mass turnover deep in the group's history, and (ii) how Miocene aridification shaped trends in biome assemblages. We find evidence of mass turnover in pygopodoids following the isolation of the Australian continental plate ∼30 million years ago, and in contrast, gradual aridification is linked to elevated speciation rates in the young arid zone. Surprisingly, our results suggest that invasion of arid habitats was not an evolutionary end point. Instead, arid Australia has acted as a source for diversity, with repeated outward dispersals having facilitated diversification of this group. This pattern contrasts trends in richness and distribution of other Australian vertebrates, illustrating the profound effects historical biome changes have on macroevolutionary patterns.

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Evolution
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71
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5
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© 2017 Society for the Study of Evolution. This is the peer reviewed version of the following article: Mass turnover and recovery dynamics of a diverse Australian continental radiation, Evolution, 71 (5), pp. 1352-1365, 2017, which has been published in final form at http://doi.org/10.1111/evo.13207. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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Ecology
Evolutionary biology
Aridification
Australia
extinction
geckos
macroevolution
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Brennan, IG; Oliver, PM, Mass turnover and recovery dynamics of a diverse Australian continental radiation, Evolution, 2017, 71 (5), pp. 1352-1365
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