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Abstract Detail


Sytsma, Kenneth J. [1], Kriebel, Ricardo [1], Spalink, Daniel [2], Sonnier, Gregory [3], Alverson, William [1], Bai, Chengke [4], Rose, Jeff [1], Zaborsky, John [1], Cameron, Kenneth M. [1], Waller, Donald M. [1], Givnish, Thomas J. [1].

The evolution of genome size and its ecological correlates: insights using a phylogenetic tree of the Northeastern North American flora.

We present a phylogenetic based approach to address genome evolution in the context of previous hypotheses of biological and ecological correlates to genome size. The study is unique in centering on a phylogenetic tree of over a quarter of a large regional flora (both native and non-native) - the Northeastern North American vascular flora (NeNAf) - in an effort to control other confounding variables. We enlarge our phylogenetic tree of the Wisconsin flora (2,327 tips) to construct a phylogenetic tree with nearly 75% of the NeNAf (3,534 tips). We increase the available number of already published C-values from the Wisconsin vascular flora, and then augment this database with published data from NeNAf for a 1,234 species match of C-values and tips. We obtain morphological, growth form, breeding system, ecological trait, and environmental data for all these species and test key hypotheses of genome evolution and these putative correlates in a phylogenetic comparative approach. We use Blomberg's K and Pagel's lambda to test for phylogenetic signal in genome size, both of which are significant. Using an OU model we determine (1) the number of significant shifts in genome size evolution across the phylogeny (17 edges) and (2) the presence of convergent shifts in unrelated clades (4 sets). Categorical and continuous traits are examined in the context of genome size using phylogenetic logistic regression or PGLS (phylogenetic generalized least squares) regression. Finally, we address the issue of scale, both taxonomic and biogeographical, in understanding the correlates of genome size evolution by using these same approaches in selected clades (e.g., angiosperms, eudicots, monocots, rosids) and in the smaller, higher latitude Wisconsin flora.

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1 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, United States
2 - University Of Utah, Department Of Biology, 257 South 1400 East, Salt Lake City, UT, 84112, United States
3 - MacArthur Agro-Ecology Research Center, Lake Placid, FL, 33852
4 - Shaaxi Normal University, College of Life Science, Xi’an, China

genome size
Eastern North America
OU model
Comparative methods
Ecological traits
phylogenetic regression.

Presentation Type: Oral Paper
Session: 18, Macroevolution I
Location: 105/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 10:45 AM
Number: 18009
Abstract ID:570
Candidate for Awards:None

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