Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/89448
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Type: Journal article
Title: Evolutionary diversification of New Caledonian Araucaria
Author: Kranitz, P.
Biffin, E.
Clark, A.
Hollingsworth, M.
Ruhsam, M.
Gardner, M.
Thomas, P.
Mill, R.
Ennos, R.
Gaudeul, M.
Lowe, A.
Hollingsworth, P.
Citation: PLoS ONE, 2014; 9(10):e110308-1-e110308-11
Publisher: Public Library of Science
Issue Date: 2014
ISSN: 1932-6203
1932-6203
Statement of
Responsibility: 
Mai Lan Kranitz, Edward Biffin, Alexandra Clark, Michelle L. Hollingsworth, Markus Ruhsam, Martin F. Gardner, Philip Thomas, Robert R. Mill, Richard A. Ennos, Myriam Gaudeul, Andrew J. Lowe, Peter M. Hollingsworth
Abstract: New Caledonia is a global biodiversity hotspot. Hypotheses for its biotic richness suggest either that the island is a ‘museum’ for an old Gondwana biota or alternatively it has developed following relatively recent long distance dispersal and in situ radiation. The conifer genus Araucaria (Araucariaceae) comprises 19 species globally with 13 endemic to this island. With a typically Gondwanan distribution, Araucaria is particularly well suited to testing alternative biogeographic hypotheses concerning the origins of New Caledonian biota. We derived phylogenetic estimates using 11 plastid and rDNA ITS2 sequence data for a complete sampling of Araucaria (including multiple accessions of each of the 13 New Caledonian Araucaria species). In addition, we developed a dataset comprising 4 plastid regions for a wider taxon sample to facilitate fossil based molecular dating. Following statistical analyses to identify a credible and internally consistent set of fossil constraints, divergence times estimated using a Bayesian relaxed clock approach were contrasted with geological scenarios to explore the biogeographic history of Araucaria. The phylogenetic data resolve relationships within Araucariaceae and among the main lineages in Araucaria, but provide limited resolution within the monophyletic New Caledonian species group. Divergence time estimates suggest a Late Cretaceous-Cenozoic radiation of extant Araucaria and a Neogene radiation of the New Caledonian lineage. A molecular timescale for the evolution of Araucariaceae supports a relatively recent radiation, and suggests that earlier (pre-Cenozoic) fossil types assigned to Araucaria may have affinities elsewhere in Araucariaceae. While additional data will be required to adequately resolve relationships among the New Caledonian species, their recent origin is consistent with overwater dispersal following Eocene emersion of New Caledonia but is too old to support a single dispersal from Australia to Norfolk Island for the radiation of the Pacific Araucaria sect. Eutacta clade.
Keywords: Coniferophyta; Calibration; Bayes Theorem; Sequence Analysis, DNA; Biodiversity; Phylogeny; Time Factors; Fossils; New Caledonia; Biological Evolution
Rights: © 2014 Kranitz et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
RMID: 0030017003
DOI: 10.1371/journal.pone.0110308
Grant ID: http://purl.org/au-research/grants/arc/FS110200051
http://purl.org/au-research/grants/arc/DP0665859
Published version: http://dx.doi.org/10.1371/journal.pone.0110308
Appears in Collections:Ecology, Evolution and Landscape Science publications

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