Open Collections

Moyers, Brook T.; Rieseberg, Loren H.

<b>Abstract</b><br/>Substantial intraspecific variation in life history is rare and potentially a signal of incipient ecological speciation, if variation is driven by geographically heterogenous natural selection. We present the first report of extensive life history polymorphism in Helianthus argophyllus, the silverleaf sunflower, and examine evidence for its evolution by divergent selection. In 18 populations sampled from across the species range and grown in a common garden, most quantitative traits covaried such that individuals could be assigned to two distinct life history syndromes: tall and late flowering with small initial flowerheads, or short and early flowering with larger initial flowerheads. Helianthus argophyllus exhibits regional genetic structure, but this population structure does not closely correspond with patterns of phenotypic variation. The early-flowering syndrome is primarily observed in populations from coastal barrier islands, while populations from the nearby mainland coast, although geographically and genetically close, are primarily late flowering. Additionally, several traits are more differentiated among regions than expected based on neutral genetic divergence (QST > FST), including the first principal component score corresponding with life history syndrome. This discordance between patterns of phenotypic and genetic variation suggests that divergent selection is driving genetic differences in life history across the species range. If so, the silverleaf sunflower may be in early stages of ecological speciation.; <b>Usage notes</b><br /><div class="o-metadata__file-usage-entry"><h4 class="o-heading__level3-file-title">2010 Common Garden Phenotypes</h4><div class="o-metadata__file-description">This is an excel spreadsheet that with two tabs: one with the data and one with an explanation of the column headers in the data sheet. This file includes all data for all individuals that were grown and measured in my 2010 field experiment at the University of British Columbia farm in Vancouver, BC, Canada. Please note that these individuals were filtered in various ways for different analyses (e.g. only those planted in the replicated family design, or excluding individuals with putative hybrid ancestry). Please contact me if you need further details or would like a filtered dataset.</div><div class="o-metadata__file-name">common_gardenFINAL.xlsx</br></div></div><div class="o-metadata__file-usage-entry"><h4 class="o-heading__level3-file-title">SNP genotype data</h4><div class="o-metadata__file-description">This is an excel spreadsheet that with two tabs: one with the data and one with an explanation of the column headers in the data sheet. This file includes all data for all individuals that were genotyped using the Sequenom iPLEX Gold technology for this study, including individuals from species other than Helianthus argophyllus which were not included in the manuscript. Please note that these individuals were filtered in various ways for different analyses (e.g. only those planted in the replicated family design, or excluding individuals with putative hybrid ancestry). Please contact me if you need further details or would like a filtered dataset.</div><div class="o-metadata__file-name">all_sequenom_data_forDryad.xlsx</br></div></div><div class="o-metadata__file-usage-entry"><h4 class="o-heading__level3-file-title">Sequenom SNP marker metadata</h4><div class="o-metadata__file-description">This is an excel spreadsheet that with two tabs: one with the data and one with an explanation of the column headers in the data sheet. This file includes data for all markers that were included in two panels of 40 by the Sequenom iPLEX Gold technology for this study. Please note that these markers were filtered for reliability and genotype call rate in the final analyses. Please contact me if you need further details or would like a filtered dataset.</div><div class="o-metadata__file-name">SNP_bylocus_data_forDryad.xlsx</br></div></div>

New Mexico; Texas; Oklahoma; Mexico

Dryad version number: 1</p>

Version status: submitted</p>

Dryad curation status: Published</p>

Sharing link: https://datadryad.org/stash/share/JYYqoqF3tV6NeRwDQDSVSG4zByLZPIC1Z2R9E44zqhw</p>

Storage size: 771268</p>

Visibility: public</p>

University of British Columbia Library

10.14288/1.0397748

https://doi.org/10.5683/SP2/JFJA4I; https://doi.org/10.5061/dryad.3c769

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