NDLI: Incipient radiation within the dominant Hawaiian tree Metrosiderospolymorpha

Content Provider	PubMed Central
Author	Stacy, E. A. Johansen, J. B. Sakishima, T. Price, D. K. Pillon, Y.
Copyright Year	2014
Abstract	Although trees comprise a primary component of terrestrial species richness, thedrivers and temporal scale of divergence in trees remain poorly understood. Weexamined the landscape-dominant tree, Metrosideros polymorpha, for variationat nine microsatellite loci across 23 populations on young Hawai'i Island,sampling each of the island's five varieties throughout its full geographicrange. For four varieties, principal coordinate analysis revealed strong clusteringof populations by variety across the 10 430 km2 island,indicating partitioning of the species into multiple evolutionarily significantunits. The single island-endemic form, riparian var. newellii, showedespecially strong differentiation from other varieties despite occurring in sympatrywith other varieties and likely evolved from a bog form on the oldest volcano,Kohala, within the past 500 000 years. Along with comparable riparian forms onother Pacific Islands, var. newellii appears to represent parallel incipientecological speciation within Metrosideros. Greater genetic distance amongthe more common varieties on the oldest volcano and an inverse relationship betweenallelic diversity and substrate age appear consistent with colonization ofHawai'i Island by older, partially diverged varieties followed by increasedhybridization among varieties on younger volcanoes. This study demonstrates thatbroad population-level sampling is required to uncover patterns of diversificationwithin a ubiquitous and long-lived tree species. Hawaiian Metrosiderosappears to be a case of incipient radiation in trees and thus should be useful forstudies of divergence and the evolution of reproductive isolating barriers at theearly stages of speciation.
Related Links	http://dx.doi.org/10.1038/hdy.2014.47
Ending Page	342
Page Count	9
Starting Page	334
File Format	PDF
ISSN	0018067X
e-ISSN	13652540
Journal	Heredity
Issue Number	4
Volume Number	113
Language	English
Publisher	Nature Publishing Group
Publisher Date	2014-10-01
Access Restriction	Open
Rights Holder	Nature Publishing Group
Subject Keyword	Genetics(clinical) Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Genetics (clinical)

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Data from: Incipient radiation within the dominant Hawaiian tree Metrosideros polymorpha (Dataset)

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Incipient radiation within the dominant Hawaiian tree Metrosiderospolymorpha

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Data from: Incipient radiation within the dominant Hawaiian tree Metrosideros polymorpha (Dataset)

Evolution of Microsatellite Loci in the Adaptive Radiation of Hawaiian Honeycreepers

Divergence with gene flow within the recent chipmunk radiation (Tamias)

A single-base substitution within an intronic repetitive element causes dominant retinitis pigmentosa with reduced penetrance

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