Evolutionary diversification of new Caledonian Araucaria.

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...

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Autores principales:	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
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dcc9f4a55aee4cc4ac170fb5d571ec82
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spelling	oai:doaj.org-article:dcc9f4a55aee4cc4ac170fb5d571ec822021-11-25T05:55:29ZEvolutionary diversification of new Caledonian Araucaria.1932-620310.1371/journal.pone.0110308https://doaj.org/article/dcc9f4a55aee4cc4ac170fb5d571ec822014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0110308https://doaj.org/toc/1932-6203New 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.Mai Lan KranitzEdward BiffinAlexandra ClarkMichelle L HollingsworthMarkus RuhsamMartin F GardnerPhilip ThomasRobert R MillRichard A EnnosMyriam GaudeulAndrew J LowePeter M HollingsworthPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e110308 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q 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 Evolutionary diversification of new Caledonian Araucaria.
description	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.
format	article
author	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
author_facet	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
author_sort	Mai Lan Kranitz
title	Evolutionary diversification of new Caledonian Araucaria.
title_short	Evolutionary diversification of new Caledonian Araucaria.
title_full	Evolutionary diversification of new Caledonian Araucaria.
title_fullStr	Evolutionary diversification of new Caledonian Araucaria.
title_full_unstemmed	Evolutionary diversification of new Caledonian Araucaria.
title_sort	evolutionary diversification of new caledonian araucaria.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/dcc9f4a55aee4cc4ac170fb5d571ec82
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Evolutionary diversification of new Caledonian Araucaria.

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