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Abstract Detail


Biogeography

Guggisberg, Alessia [1], Mansion, Guilhem [1], Kelso, Sylvia [2], Conti, Elena [1].

Evolution of biogeographic patterns, ploidy levels, and breeding systems in a diploid-polyploid species complex of Primula.

PRIMULA sect. Aleuritia subsect. Aleuritia (Aleuritia) includes diploid, self-incompatible heterostyles and polyploid, self-compatible homostyles, the latter generally occurring at higher latitudes than the former. This study develops a phylogenetic hypothesis for Aleuritia to elucidate the interactions between Pleistocene glacial cycles, biogeographic patterns, ploidy levels, and breeding systems. Sequences from five chloroplast DNA loci were analysed with parsimony to reconstruct a phylogeny, haplotype network, and ancestral states for ploidy levels and breeding systems. The results supported the monophyly of Aleuritia and four major biogeographic lineages: an amphi-Pacific, a South-American, an amphi-Atlantic and a European/North-American lineage. At least four independent switches to homostyly and five to polyploidy were inferred. An Asian ancestor probably gave origin to an amphi-Pacific clade and to a lineage that diversified on the European and American continents. Switches to homostyly occurred exclusively in polyploid lineages, which mainly occupy previously glaciated areas. The higher success of the autogamous polyploid species at recolonising habitats freed by glacial retreat might be explained in terms of selection for reproductive assurance.


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Related Links:
Personal webpage of Alessia Guggisberg
Personal webpage of Dr. Guilhem Mansion
Personal webpage of Prof. Elena Conti
Personal webpage of Prof. Sylvia Kelso


1 - Universität Zürich, Institut für Systematische Botanik, Zollikerstrasse 107, Zürich, CH-8008, Schweiz
2 - Colorado College, Biology Department, 14 E. Cache La Poudre, Colorado Springs, Colorado, 80903, USA

Keywords:
arctic-alpine biogeography
heterostyly
polyploidy
homostyly
Primula
reproductive assurance
Pleistocene glaciations
secondary contact model.

Presentation Type: Poster:Posters for Topics
Session: 48-208
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:61


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