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Abstract Detail


Humphreys, Emily [1], Edwards, Caroline [2], Last, Noah [1], Olivieri, Julia [3], Brunner, Anna [4], Mikenas, Jessica [5], Henzler-Lhasawa, Chamden [1], Douglas, Norman [6], Flores Olvera, Hilda [7], Ochoterena, Helga [8], Hernandez Ledezma, Patricia [9], Nosratinia, Sonia [10], LoPresti, Eric [2], Weber, Marjorie [11], Thulin, Mats [12], Perersen, Gitte [13], Friis, Ib [13], Moore, Michael [14].

Diversification Over Time: Constructing a Molecular Phylogeny of the Four O’Clock Tribe (Nyctaginaceae tribe Nyctagineae).

Nyctaginaceae tribe Nyctagineae is comprised of almost 200 species of flowering plants, most of which grow in the arid and semiarid regions of North America. Little is known about the pace of evolution in the group, and what characteristics or events may have led to the current diversity of the tribe. For example, do bursts of diversification in Nyctagineae correspond to past episodes of global cooling and drying, or do intrinsic factors such as the evolution of habitat preferences better explain the diversification? The tribe is also strongly associated with gypsum soils. Eight lineages of Nyctagineae have independently specialized for growing on gypsum (CaSO4·2H2O), which suggests that some characteristic stemming from their shared evolutionary history may predispose the tribe for success on this distinct soil. To address these questions, we are reconstructing a species level phylogeny for Nyctagineae using DNA sequence data from one nuclear (ITS) and two chloroplast (ndhF/rpl32 and rpl32/trnL) regions. So far, 138 species have been sampled. We will then reconstruct the history of soil preference and diversification rate within within the tribe, and test for correlations with climate history.

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Evolution of Chihuahuan Desert Gypsum Endemics

1 - Oberlin College, Department of Biology, 119 Woodland St. , Oberlin, OH, 44074, USA
2 - Michigan State University , Department of Plant Biology, 612 Wilson Rd., East Lansing, MI, 48824, USA
3 - Stanford University , Institute for Computational and Mathematical Engineering, 475 Via Ortega , Stanford, CA, 94305, USA
4 - Healing our Waters - Great Lakes Coalition, 213 West Liberty St., Suit 200, Ann Arbor, MI, 48104, USA
5 - USGS Canyonlands Research Station, Southwest Biological Science Center, 2290 S West Resource Blvd, Moab, UT, 84532, USA
6 - University Of Florida, Biology, PO Box 118525, Gainesville, FL, 32611, United States
7 - Instituto de Biologia, UNAM, Botanica, Apto. , Postal 70-367, Coyoacan , DF, 04510, Mexico
8 - Instituto De Biología, UNAM, Botanica, Depto Botánica-Apdo.Postal 70-367, Coyoacan, Mexico DF, 04510, Mexico
9 - INECOL, Centro Regional del Bajio,, Pa´tzcuaro, Michoaca´n, Mexico
10 - University of California, Berkeley , Department of Integrative Biology , 3040 Valley Life Sciences Building #3140, Berkeley , CA, 97720, USA
11 - Michigan State University, Plant Biology Laboratories , 612 Wilson Rd., East Lansing, 48104, MI, USA
12 - Uppsala University , Department of Organismal Biology, Norbyv. 18D, 75236, Uppsala, Sweden
13 - University of Copenhagen , Natural History Museum of Denmark, Oster Farimagsgade 2b, Copenhagen , 1353, Denmark
14 - Oberlin College, Department Of Biology, 119 Woodland St., Science Center K111, Oberlin, OH, 44074, United States


Presentation Type: Poster
Session: P, Systematics Posters
Location: Arizona Ballroom/Starr Pass
Date: Monday, July 29th, 2019
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PSY004
Abstract ID:198
Candidate for Awards:None

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