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Abstract Detail

Species delimitation in polyploid complexes

Oberprieler, Christoph [1], Oxelman, Bengt [2].

Species delimitation in polyploid complexes.

Hybridisation, whole-genome duplication (autopolyploidy), and the combination of these two processes (allopolyploidy) are paramount processes in the evolution and diversification offlowering plants and ferns. Gene flow at the diploid and polyploid level, multiple formation of polyploid species, often under reciprocal parentage, and the young age of polyploid species radiations account for the taxonomy of polyploid complexes being the ultimate challenge for a DNA-based, phylogenetic species delimitation approach. Additionally, reconstructions of the evolutionary history of polyploid complexes are still hampered by the scarcityof efficient, explicit methods for the reconstruction of reticulate (species) phylogenies. The proposed colloquium aims at communication of methodological approaches allowing the fast discovery and delimitation of evolutionary significant units (species) and the reconstruction of species trees and networks in polyploid complexes using genomic, morphological, and geographic distribution data (including climatic niches). Growing evidence for the importance of reticulation events among lineages in the evolutionary history of many plant groups have rendered our gene-tree reconstructions to be only a local optimum on the path toward the long-standing conceptual goal of systematics, which isa tree or network of species. In addition, the advent of large multilocus datasets (phylogenomics) with their large numbers of independently segregating and individually evolving loci will also necessitate the application of new algorithms for estimating species trees/networks from a setof, often contradictory, gene trees. Five years ago the two applicants (Oberprieler, Oxelman) have co-organized a colloquium on species-network reconstruction in polyploids on the occasion of the Botany2013 meeting in New Orleans. After some progress in the field of phylogenetics in polyploids and the growing interest in the methodological field of species delimitation (in diploids), the proposed colloquium aims to provide a forum to present and discuss research connected with species delimitation and species tree/network reconstruction in polyploid complexes.

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1 - Institute Of Plant Sciences, University Of Regensburg, Universitaetsstr. 31, Regensburg, Bavaria, D-93040, Germany
2 - University of Gothenburg, Gothenburg, Sweden

species delimitation
coalescent theory
gene trees
species networks
molecular phylogenetics

Presentation Type: Colloquium Presentations
Session: CO01, Species delimitation in polyploid complexes
Location: Tucson J/Starr Pass
Date: Monday, July 29th, 2019
Time: 8:00 AM
Number: CO01SUM
Abstract ID:22
Candidate for Awards:None

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