Evolution, Ecology and Floristics in Northern California - Current Knowledge and Unexplored Realms
Parker, V. Thomas .
Patterns of speciation in Arctostaphylos (Ericaceae).
WHILE one species of Arctostaphylos (A. uva-ursi) has a circumboreal distribution, within California this genus has radiated into nearly 100 different taxa. Some of these species are widespread, but the vast majority are local soil or climatic endemics. These species are principally found within chaparral or related vegetation and consequently experience wildfire as a major ecological process. Populations either are killed by fire and recover by germination from a persistent soil seed bank (obligate seeders), or mostly survive fire and resprout from a burl as well as establishing new individuals from the seed bank (facultative sprouters). A recently completed molecular phylogeny has provided considerable insight into possible mechanisms of speciation within the genus. Modeling, molecular, and morphological data will be used to illustrate 3 possible mechanisms, selection under allopatry, diploid hybrid speciation, and allopolyploidy.
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1 - San Francisco State University, Department of Biology, 1600 Holloway Avenue, San Francisco, California, 94132
Presentation Type: Symposium or Colloquium Presentation
Date: Tuesday, August 1st, 2006
Time: 3:00 PM