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On the biogeography of Centipeda: a species-tree diffusion approach

Journal article
Authors Stephan Nylinder
Philippe Lemey
Mark de Bruyn
Marc Suchard
Bernard E. Pfeil
Neville Walsh
Arne Anderberg
Published in Systematic Biology
Volume 63
Issue 2
Pages 178-191
ISSN 1063-5157
Publication year 2014
Published at Department of Biological and Environmental Sciences
Pages 178-191
Language en
Links dx.doi.org/10.1093/sysbio/syt102
https://gup.ub.gu.se/file/126961
Keywords Australia, BEAST, biogeography, Centipeda, continuous diffusion, Pliocene, species-tree
Subject categories Botany, Biological Systematics, Evolutionary Biology

Abstract

Reconstructing the biogeographic history of groups present in continuous arid landscapes is challenging due to the difficulties in defining discrete areas for analyses, and even more so when species largely overlap both in terms of geography and habitat preference. In this study, we use a novel approach to estimate ancestral areas for the small plant genus Centipeda. We apply continuous diffusion of geography by a relaxed random walk where each species is sampled from its extant distribution on an empirical distribution of time-calibrated species-trees. Using a distribution of previously published substitution rates of the internal transcribed spacer (ITS) for Asteraceae, we show how the evolution of Centipeda correlates with the temporal increase of aridity in the arid zone since the Pliocene. Geographic estimates of ancestral species show a consistent pattern of speciation of early lineages in the Lake Eyre region, with a division in more northerly and southerly groups since approximately 840 ka. Summarising the geographic slices of species-trees at the time of the latest speciation event (∼20 ka), indicates no presence of the genus in Australia west of the combined desert belt of the Nullabor Plain, the Great Victoria Desert, the Gibson Desert, and the Great Sandy Desert, or beyond the main continental shelf of Australia. The result indicates all western occurrences of the genus to be a result of recent dispersal rather than ancient vicariance. This study contributes to our understanding of the spatiotemporal processes shaping the flora of the arid zone, and offers a significant improvement in inference of ancestral areas for any organismal group distributed where it remains difficult to describe geography in terms of discrete areas.

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