Abstract Detail

Systematics

Drummond, Chloe P. [1], Kuchenreuther, Margaret A. [2], Sytsma, Kenneth J. [3].

Great Lakes-Western North American disjunct plants: a review of the distribution and three phylogeographic case studies.

The distinctive disjunct distribution between Western North America and the Great Lakes region involves as least 70 species of plants. Although the species exhibiting this distribution were first reviewed nearly 40 years ago, no full review has included plants found eastward into the St. Lawrence Seaway. We present an updated review of this biogeographical disjunct pattern using geo-referenced specimen data, leverage population genetic analyses of different species illustrating this disjunction, and discuss implications for various Pleistocene biogeographic hypotheses generating this disjunct pattern. To illuminate the underlying biogeographic histories that comprise this broader pattern, we conduct in-depth genomic analyses in three case studies: Aconitum columbianum (Ranunculaceae), Oplopanax horridus (Araliaceae), and Rubus parviflorus (Rosaceae). We use genotyping-by-sequencing (GBS) data, from 12-18 populations per species, to reconstruct evolutionary relationships between populations using Maximum Likelihood, Bayesian and coalescence approaches, and identify admixture between populations using population structure. We use populations defined by our structure analysis as input for testing explicit demographic population genetic scenarios of vicariance and dispersal, using Approximate Bayesian Computation. To account for the divergence time of these North American species and their populations, we construct broader genus and family chronograms using a supermatrix approach, including multiple genetic markers and a subset of GBS loci. Our analyses reveal that these species have different underlying phylogeographic histories, indicating a more complex, pseudoparallel biogeographic pattern.

1 -
2 - University Of Minnesota, Morris, DIV OF SCIENCE & MATHEMATICS, 600 East 4th St., Morris, MN, 56267, United States
3 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, United States

Keywords:
Aconitum columbianum
Oplopanax horridus
Rubus parviflorus
Phylogeography
disjunct populations
genotyping-by-sequencing
Pleistocene
Western North America
Great Lakes.

Presentation Type: Oral Paper
Session: 26, ASPT Cooley Awards II
Location: 110/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 2:00 PM
Number: 26003
Abstract ID:889
Candidate for Awards:George R. Cooley Award