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Abstract Detail

Modeling the processes that mediate speciation and extinction rates across plants

Ramírez-Barahona, Santiago [1], Rutschke, Kristen [2], Knudson, Christina [3], Sessa, Emily [4], Zenil-Ferguson, Rosana [5].

The impact of polyploidy and biome preferences on fern diversification.

Polyploidy is recognized as a major force in plant evolution, affecting diversification rates across lineages. Although widespread across plants, the frequency of polyploidy varies considerably among taxonomic groups. In particular, the contribution of polyploidy to speciation in ferns appears to be double that observed in seed plants. However, the impact of polyploidization on diversification rate heterogeneity across the fern phylogeny remains uncertain. Here we ask whether polyploidization and habitat preferences are linked to differences in rates of species diversification across ferns. To explore this, we compiled data on chromosome counts, polyploidy, and geographic distribution and integrated these with a comprehensive, dated phylogenetic tree for ferns. By fitting state-dependent diversification models we recovered faster diversification rates in diploids than in polyploids but only within temperate and tropical biomes; rates of diversification for polyploids do not differ by biome and are similar to rates for diploids within arid biomes. By assessing the relative contributions of polyploidy and biome preferences, and their interaction, to fern diversification, we provide key insights into evolution and diversity across the fern tree of life.

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1 - Universidad Nacional Autónoma de México, Departamento de Botánica, Instituto de Biología, Ciudad de México, México
2 - University of St. Thomas, Department of Mathematics, Saint Paul, MN, USA
3 - University of St. Thomas, Minnesota, Department of Mathematics, Saint Paul, MN, USA
4 - University Of Florida, Biology, Box 118525, 521A Bartram Hall, Gainesville, FL, 32611, United States
5 - University of Hawaii, School of Life Sciences, Honolulu, HI, USA

none specified

Presentation Type: Colloquium Presentations
Session: C01, Modeling the processes that mediate speciation and extinction rates across plants
Location: /
Date: Monday, July 19th, 2021
Time: 1:00 PM(EDT)
Number: C01010
Abstract ID:359
Candidate for Awards:None

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