Abstract Detail



Macroevolution

Ramirez-Barahona, Santiago [1], Sessa, Emily  [2], Zenil-Ferguson, Rosana [3].

The impact of polyploidy and habitat preferences on fern diversification.

One of the long-standing questions in fern evolution is the incidence of polyploidy that originated large numbers of chromosomes. One possible explanation is that ferns have been subjected to repeated polyploidy events, followed by slow rates of chromosome loss. Another potential explanation is that polyploidization may be recurrent and also linked to faster net diversification rates across all the fern phylogeny.  In this presentation, we address the links between polyploidy and lineage diversification using state-dependent diversification models. We expand our study to ask if ecological preferences among fern lineages and the interaction of those preferences with polyploidy could also result in lineages that are more successful in macroevolutionary timescales.  In this study, we compile a large dataset on chromosome counts and geographic occurrence records for fern species and integrate these data into a comprehensive dated phylogeny. We propose new state-dependent diversification models to investigate how diversification rates and their heterogeneity are associated with polyploidy and habitat preferences using biomes. By comparing the relative contribution of these factors, and their interaction, to fern diversification, we provide a more comprehensive overview of the evolution and diversity of polyploidy across the fern tree of life.


1 - Universidad Nacional Autonoma de Mexico, Instituto de Biologia, Cto. Zona Deportiva S/N, C.U., Ciudad de Mexico, CDMX, 04510, Mexico
2 - University of Florida, Department of Biology, 220 Bartram Hall P.O. Box 118525, Gainesville, FL, 32611, USA
3 - University Of Hawaii, School Of Life Sciences, 2538 McCarthy Mall, Edmonson 309, Honolulu, HI, 96822, United States

Keywords:
polyploidy
Diversification
Biomes
SSE models
Ferns.

Presentation Type: Oral Paper
Number: MACRO1003
Abstract ID:780
Candidate for Awards:None


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