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A comparative analysis of island floras challenges taxonomy-based biogeographical models of speciation

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Title: A comparative analysis of island floras challenges taxonomy-based biogeographical models of speciation
Authors: Igea, J
Bogarin, D
Papadopulos, AST
Savolainen, V
Item Type: Journal Article
Abstract: Speciation on islands, and particularly the divergence of species in situ, has long been debated. Here, we present one of the first, complete assessments of the geographic modes of speciation for the flora of a small oceanic island. Cocos Island (Costa Rica) is pristine; it is located 550 km off the Pacific coast of Central America. It harbors 189 native plant species, 33 of which are endemic. Using phylogenetic data from insular and mainland congeneric species, we show that all of the endemic species are derived from independent colonization events rather than in situ speciation. This is in sharp contrast to the results of a study carried out in a comparable system, Lord Howe Island (Australia), where as much as 8.2% of the plant species were the product of sympatric speciation. Differences in physiography and age between the islands may be responsible for the contrasting patterns of speciation observed. Importantly, comparing phylogenetic assessments of the modes of speciation with taxonomy-based measures shows that widely used island biogeography approaches overestimate rates of in situ speciation.
Issue Date: 16-Jan-2015
Date of Acceptance: 28-Nov-2014
URI: http://hdl.handle.net/10044/1/40696
DOI: http://dx.doi.org/10.1111/evo.12587
ISSN: 0014-3820
Publisher: Wiley
Start Page: 482
End Page: 491
Journal / Book Title: Evolution
Volume: 69
Issue: 2
Copyright Statement: This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Sponsor/Funder: Natural Environment Research Council (NERC)
Commission of the European Communities
Natural Environment Research Council (NERC)
Funder's Grant Number: NE/F002769/1
233190
NE/M015742/1
Keywords: Science & Technology
Life Sciences & Biomedicine
Ecology
Evolutionary Biology
Genetics & Heredity
Environmental Sciences & Ecology
Cladogenesis
Cocos Island
phylogeny
sympatric speciation
LORD HOWE ISLAND
OCEANIC ISLAND
COCOS-ISLAND
SYMPATRIC SPECIATION
SPECIES TREES
COSTA-RICA
GENE TREES
DIVERSITY
PATTERNS
EVOLUTION
Costa Rica
Genetic Markers
Genetic Speciation
Islands
Molecular Sequence Data
Phylogeny
Phylogeography
Plants
0603 Evolutionary Biology
Publication Status: Published
Appears in Collections:Faculty of Natural Sciences



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