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Origin and diversification of the california flora: re-examining classic hypotheses with molecular phylogenies.

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Author

  • Lesley Lancaster
  • Kathleen M Kay

Summary, in English

The California Floristic Province exhibits one of the richest floras on the planet, with more than 5500 native plant species, approximately 40% of which are endemic. Despite its impressive diversity and the attention it has garnered from ecologists and evolutionary biologists, historical causes of species richness and endemism in California remain poorly understood. Using a phylogenetic analysis of 16 angiosperm clades, each containing California natives in addition to species found only outside California, we show that CA's current biodiversity primarily results from low extinction rates, as opposed to elevated speciation or immigration rates. Speciation rates in California were lowest among Arcto-Tertiary lineages (i.e., those colonizing California from the north, during the Tertiary), but extinction rates were universally low across California native plants of all historical, geographic origins. In contrast to long-accepted ideas, we find that California diversification rates were generally unaffected by the onset of the Mediterranean climate. However, the Mediterranean climate coincided with immigration of many desert species, validating one previous hypothesis regarding origins of CA's plant diversity. This study implicates topographic complexity and climatic buffering as key, long-standing features of CA's landscape favoring plant species persistence and diversification, and highlights California as an important refuge under changing climates.

Publishing year

2013

Language

English

Pages

1041-1054

Publication/Series

Evolution

Volume

67

Issue

4

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Biological Sciences

Keywords

  • extinction
  • Biogeography
  • fossils
  • macroevolution
  • phylogenetics
  • speciation

Status

Published

Research group

  • Molecular Ecology and Evolution Lab

ISBN/ISSN/Other

  • ISSN: 1558-5646