Browsing by Author "Etterson, Julie"
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Item 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 projectThe 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.Item The Risk to Native Minnesota Beach Grass, Ammophilia breviligulata, Posed by Historical Restoration Efforts that Used Michigan Plants.(2006) Anderson, Rebecca; Etterson, JulieThere 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.Item 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, JulieItem 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.