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Abstract Detail

Systematics Section

Töpel, Mats [1], Eriksen, Bente [1], Ertter, Barbara [2], Antonelli, Alexandre [3].

Rapid radiation of the draught-adapted ivesioid Potentilleae (Rosaceae) correlates with the Sierra Nevada uplift and subsequent climate change.

The ivesioid Potentilleae, primarily Ivesia and Horkelia, consist of 50+ species endemic to western North America. The species comprise a molecularly well-supported and morphologically distinct clade nested within Potentilla, which is accordingly paraphyletic if segregate genera are recognized. We have dated the Rosaceae family chloroplast phylogeny and found that the rapid radiation of this drought-adapted group of species correlates in time with the dramatic climate change in the southwestern United States that began in the Miocene and continued through the Pliocene (5.3 – 1.8 Ma), resulting in large part from the uplift of the Sierra Nevada. As the climate grew increasingly drier, plant communities experienced extensive shifts in distribution patterns followed by ecosystem breakup in and around the interior deserts. Niche modeling has been used to investigate if this radiation of the ivesioids is tied with the developing climate of the Pliocene in southwestern North America.

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1 - University of Gothenburg, Department of Plant and Environmental Sciences, Box 461, Göteborg, 405 30, Sweden
2 - University of California Berkeley, Jepson Herbarium, 1001 Valley Life Sciences Building 2465, Berkeley, California, 94720-2465, USA
3 - Institute of Systematic Botany, Zollikerstrasse 107, CH 8008, Switzerland

molecular dating
Niche modeling
Drought adaptation

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 2
Location: Alpine C/Snowbird Center
Date: Monday, July 27th, 2009
Time: 10:00 AM
Number: 2008
Abstract ID:504

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