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Abstract Detail


Biogeography

Sytsma, Kenneth J. [1], Levin, Rachel [2], Walker, Jay B. [1], Pires, J. Chris [3], Delventhal, Naomi [4].

The evolution and biogeography of California Floristic Province lineages: clock calibrations for Onagreae, Salvia, Lepechinia, and the Brodiaea complex.

THE California Floristic Province (CA-FP) is characterized by a large number of species and a very high degree of endemism. That the flora is a mixture of two distinct floristic elements northern, temperate and southern, xeric has been stated and elaborated on for almost a century. Detailed analyses of fossils and climate histories have provided a number of biogeographical hypotheses (Arcto-Tertiary, Madro-Tertiary, Madrean-Tethys) for the origin and timing of the assembly of this distinctive flora. The recent coupling of phylogenetic histories and fossil evidence via phylogenetic dating provides an independent testing of these hypotheses. We present detailed phylogenies and calibrated chronograms for monophyletic lineages of CA-FP elements that have arid SW North American sister groups and thus are testable under the Madro-Tertiary hypothesis. These lineages include (1) core tribe Onagreae (Clarkia, Camissonia, and relatives in Onagraceae), (2) Salvia sects. Audibertia and Echinosphace (Lamiaceae), (3) Lepechinia sect. Calycinae (Lamiaceae), and (4) the Brodiaea complex (Themidaceae). Results indicate that the Madro-Tertiary hypothesis is generally supported by these examples with CA-FP lineages dating from early Miocene or more recent, although the biogeographical patterns are often complex. These Madro-Tertiary examples are compared to other, more recent, Arcto-Tertiary lineages within the CA-FP.[c.e.:srb]


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1 - University of Wisconsin Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706-1381, USA
2 - Amherst College, Department of Biology, Mcguire Life Sciences Building, Amherst, Massachusetts, 01002, USA
3 - University of Missouri Columbia, Biological Sciences, 1201 Rollins Road, Life Sciences Center 311, Columbia, Missouri, 65211, USA
4 - University of Manitoba, Department of Zoology, Winnipeg, Manitoba, MB R3T 2N2, Canada

Keywords:
chronograms
Madro-Tertiary
California Floristic Province
Eocene
molecular phylogenetics
historical biogeography.

Presentation Type: Oral Paper:Papers for Topics
Session: 64-7
Location: 134/Performing Arts Center
Date: Wednesday, August 2nd, 2006
Time: 9:30 AM
Abstract ID:437


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