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Abstract Detail

Systematics Section

Mort, Mark E. [1], Kim, Seung-Chul [2], Santos-Guerra, Arnoldo [3].

Timing and rates of evolution within the Aeonium alliance (Crassulaceae).

The Macaronesian members of Crassulaceae form a well supported monophyletic group that comprises ~55 species circumscribed into three genera- Aichryson, Monanthes, and Aeonium (the Aeonium alliance). The majority of species in these genera are endemic to the Canary Islands, but elements of each are present in Cape Verde Islands, Madeira, and the Salvage islands. Previous phylogenetic analyses have confirmed the monophyly of the lineage and place several species of Sedum from Morocco as the sister group. Here we present results of analyses that aim to estimate the dates and rates of divergence among the genera. Our results indicate that within the Aeonium alliance, ages of Aichryson, Monanthes, and Aeonium (including Greenovia) are estimated to be 8.67 Ma, 6.93 Ma, and 10.23 Ma, respectively. Estimated rates of diversification of the Aeonium alliance (0.24) are on the low end of the range inferred for other continental and insular radiations (e.g., angiosperm families, rodent families, and recent African large-mammal genera).

Broader Impacts:

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1 - University of Kansas, Department of Ecology & Evolutionary Biology, Natural History Museum and Biodiversity Research Center, 1200 Sunnyside Avenue, Lawrence, Kansas, 66045-7534, USA
2 - Sung Kyun Kwan University, Department of Biological Sciences, 300 Cheoncheon-Dong, Jangan-Gu, Suwon, Korea
3 - Unidad de Botánica (ICIA), Puerto de la Cruz, Canary Islands, Tenerife,

Canary Islands
Aeonium alliance
diversification rates.

Presentation Type: Oral Paper:Papers for Sections
Session: 10
Location: Ballroom D/Convention Center
Date: Monday, August 2nd, 2010
Time: 1:30 PM
Number: 10003
Abstract ID:598

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