DOI: 10.5061/dryad.6f785
title: Data from: Genetic analysis of an ephemeral intraspecific hybrid zone in the hypervariable tree, Metrosideros polymorpha, on Hawai'i Island

description: Intraspecific hybrid zones involving long-lived woody species are rare and
 can provide insights into the genetic basis of early-diverging traits in
 speciation. Within the landscape-dominant Hawaiian tree, Metrosideros
 polymorpha, are morphologically distinct successional varieties, incana
 and glaberrima, that dominate new and old lava flows, respectively, below
 1200 me on volcanically active Hawai'i Island, with var. glaberrima
 also extending to higher elevations and bogs. Here, we use morphological
 measurements on 86 adult trees to document the presence of an
 incana-glaberrima hybrid zone on the 1855 Mauna Loa lava flow on east
 Hawai'i Island and parent-offspring analysis of 1311 greenhouse
 seedlings from 71 crosses involving 72 adults to estimate heritabilities
 and genetic correlations among vegetative traits. Both the variation in
 adult leaf pubescence at the site and the consistency between adult and
 offspring phenotypes suggest the presence of two hybrid classes, F1s and
 var. incana backcrosses, as would be expected on a relatively young lava
 flow. Nine nuclear microsatellite loci failed to distinguish parental and
 hybrid genotypes. All four leaf traits examined showed an additive genetic
 basis with moderate to strong heritabilities, and genetic correlations
 were stronger for the more range-restricted var. incana. The differences
 between varieties in trait values, heritabilities and genetic
 correlations, coupled with high genetic variation within but low genetic
 variation between varieties, are consistent with a multi-million-year
 history of alternating periods of disruptive selection in contrasting
 environments and admixture in ephemeral hybrid zones. Finally, the
 contrasting genetic architectures suggest different evolutionary
 trajectories of leaf traits in these forms.
description: Stacyetal_HeredityMay2016_AllDataForDryadFive data files for Stacy, Johansen, Sakishima & Price. 2016. Genetic analysis of an ephemeral intraspecific hybrid zone in the hypervariable tree, Metrosideros polymorpha, on Hawai’i Island. Heredity (accepted for publication May 2016). There are 5 files compiled in one Excel file and also saved in 5 individual CSV files. 1) Adult morphology data for 86 trees in the hybrid zone studied. 2) Phenotype data for 1,311 individual seedlings produced through controlled crosses involving 72 hybrid-zone adults. 3) Midparent and midoffspring phenotypes for 124 crosses among 72 hybrid-zone trees. Reciprocal crosses (e.g., tree 3 --&gt; tree 5 and tree 5 --&gt; tree 3) are shown separately. 4) Genotype data for four classes of hybrid-zone trees (I, H1, H2, G) at 9 microsatellite loci. 5) The same 9-microsatellite-locus data set supplemented with 7 and 4 additional I and G populations, respectively from across Hawaii Island.Stacyetal_HeredityMay2016_HybridZoneAdultTreeMorphologyStacyetal_HeredityMay2016_IndividualSeedlingPhenotypesStacyetal_HeredityMay2016_Midparent&MidoffspringPhenotypesStacyetal_HeredityMay2016_HybridZoneSSRGenotypesStacyetal_HeredityMay2016_SSRGenotypesSupplemented