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Abstract Detail


Clark, John R. [1], Jolles, Diana [2], Bramley, Gemma [3], Atkins, Hannah [4], Wagner, Warren [5].

A third of the way there: a 200 species phylogenetic and biogeographic hypothesis for the ~600 species paleotropical-Pacific plant genus Cyrtandra (Gesneriaceae).

Recent progress in sampling and analysis of approximately 200 species of the paleotropical-Pacific angiosperm genus Cyrtandra(Gesneriaceae; ~600 species total), are here presented. The genus has proven a challenge for systematist owing to its large size, broad distribution, and complex patterns of speciation in the remote Pacific. Current phylogenetic and biogeographic hypotheses are presented based on ITS, ETS and psbA-trnH genic sequence data. These studies, which now include broad sampling from southeast Asia, further support a hypothesis of rapid lineage radiations, particularly within the Pacific clade. Suites of conserved, plesiomorphic characters identified across distantly related species suggest a pattern of repeated, progenitor-derivatives pecies pairs that have potentially led to the great distribution of this genus. Essentially, species with wide ecological tolerances are dispersed to new habitats/islands where subsequent autochthonous island diversification occurs. These patterns are explored in light of recent advances in our understanding of relationships in Cyrtandra including historical ideas concerning quantum speciation(sensu Grant, 1971), and how they relate to our findings.

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1 - Rancho Santa Ana Botanic Garden, c/o Catalina Island Conservancy, PO Box 2739, Avalon, CA, 90704, USA
2 - Rancho Santa Ana Botanic Garden, Claremont Graduate University, 1500 North College Avenue, Claremont, CA, 91711, USA
3 - Royal Botanic Gardens, Kew, Herbarium, Library, Art & Archives Directorate, Richmond, TW9 3AE, UK
4 - Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, UK
5 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, PO Box 37012, WASHINGTON, DC, 20013-7012, USA, 202/633-0968

Island Evolution
progenitor-derivative speciation
quantum speciation
island biogeography

Presentation Type: Oral Paper:Papers for Topics
Session: 37
Location: Franklin B/Hyatt
Date: Tuesday, July 10th, 2012
Time: 3:30 PM
Number: 37008
Abstract ID:849

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