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Browsing by Author "Etterson, Julie"

Now showing 1 - 5 of 5
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    Dataset supporting Domestication during restoration: Unintentional selection during eight generations of wild seed propagation reduces herkogamy, dichogamy, and heterozygosity in Clarkia pulchella
    (2024-08-29) Etterson, Julie; Fliehr, Paige; Pizza, Riley; Gross, Briana; jetterso@d.umn.edu; Etterson, Julie; Etterson & Gross labs, University of Minnesota Duluth
    Seed production on native seed farms has increased to meet the rising demand for plant material for restoration. However, few studies have tested whether cultivation of wild populations imposes selection and elicits evolutionary change that aligns with process of crop domestication, and those that have report mixed results. Here we show that eight generations of propagation resulted in floral and genomic change in Clarkia pulchella Pursh (Onagraceae) compared to the wild source populations. Both herkogamy and dichogamy i.e., the physical and temporal separation of male and female flower parts, respectively) were significantly decreased between cultivated and wild populations. To determine if these changes resulted in the loss of heterozygosity and overall levels of genetic diversity, we examined >6,500 SNPs derived from RAD-seq data from 46 wild and 47 farmed samples. We show that mean and median heterozygosity of the farmed samples was 81.7% and 61.9% less than that of the wild samples, respectively. This was strongly driven by a loss of alleles, resulting in more than double the number of SNPs with a heterozygosity of zero. This reduction in genetic diversity was significant whether the farmed samples were compared to the pooled wild samples or to a single population. This suggests cultivation of wild populations may be having similar effects to the early stages of crop domestication. We discuss these results in the context of native seed farming and measures that can retain the genetic integrity of wild population during the process of seed increase for restoration. (Genomic data stored in GenBank)
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    Natural selection and neutral evolutionary processes contribute to genetic divergence in leaf traits across a precipitation gradient in the tropical oak Quercus oleoides
    (2018-02-28) Ramírez-Valiente, José A.; Deacon, Nicholas J.; Etterson, Julie; Center, Alyson; Sparks, Jed P.; Sparks, Kimberlee L.; Longwell, Timothy; Pilz, George; Cavender-Bares, Jeannine; cavender@umn.edu; Cavender-Bares, Jeannine; LOARD: Live Oak Adaptation and Response to Drought project
    The impacts of drought are expanding worldwide as a consequence of climate change. However, there is still little knowledge of how species respond to long-term selection in seasonally-dry ecosystems. In this study, we used QST-FST comparisons to investigate (i) the role of natural selection on population genetic differentiation for a set of functional traits related to drought resistance in the seasonally-dry tropical oak Quercus oleoides and (ii) the influence of water availability at the site of population origin and in experimental treatments on patterns of trait divergence. We conducted a thorough phenotypic characterization of 1896 seedlings from ten populations growing in field and greenhouse common gardens under replicated watering treatments. We also genotyped 222 individuals from the same set of populations using eleven nuclear microsatellites. The data sets include all of the raw data used in the analyses include nuclear microsatellites from populations examined in the field common garden, phenotypic data from a field common garden, nuclear microsatellites from populations examined in a greenhouse experiment, and phenotypic data from a field common garden.
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    The Risk to Native Minnesota Beach Grass, Ammophilia breviligulata, Posed by Historical Restoration Efforts that Used Michigan Plants.
    (2006) Anderson, Rebecca; Etterson, Julie
    There is mounting concern over the source and genetic history of plants used in restoration projects. This is because genetic mixing between remnant native plants and introduced nonlocal plants can have positive or negative effects on population fitness. In the past, nonlocal beach grass, Ammophila breviligulata, from Michigan were planted near remnant native populations at Park Point in Duluth as a component of dune restoration. This publication reports on efforts to assess the potential impact of these historical plantings. The authors conclude that Michigan genotypes may outcompete or swamp threatened Minnesota genotypes as a result of vegetative and reproductive fitness advantages. If Michigan plants begin to dominate Park Point, there will be an overall loss of genetic diversity. The authors recommend that local genotypes be used for all future dune restoration projects at Park Point.
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    A Test of Forestry Practices to Mediate the Effects of Climate Change Using Two Native Oaks (2015-04-10)
    (2015) Kavajecz, Laura; University of Minnesota Duluth. Department of Biology; Etterson, Julie
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    UMD Biology lightning talk (2021-01-22)
    (2021) Dahl, John; Mensinger, Allen; Etterson, Julie; University of Minnesota Duluth. Department of Biology
    "The Thing in the Bog: Hidden Mycobacterial Treasure in Sphagnum Peat Bogs," Speaker: John Dahl, Associate Professor at the University of Minnesota Duluth; "Toadfish communication," Speaker: Allen Mensinger, Professor at the University of Minnesota Duluth; "Project Baseline, the resurrection is coming," Speaker: Julie Etterson, Professor at the University of Minnesota Duluth.