Okada, Miki , Lyle, Mark , Jasieniuk, Marie .
Genotypic diversity and geographic origin of invasive populations of Cortaderia jubata (Poaceae).
INFORMATION on the genetic diversity and structure of populations and the geographic origin of invasive species is fundamental to understanding the causes of invasion success and potentially useful for management of invasive populations. Cortaderia jubata is a large, apomictic bunchgrass native to the Andes of South America that has become an aggressive invader of natural areas in many parts of the world, including California, Hawaii, New Zealand, Australia, and South Africa. We characterized the genetic and phylogeographic structure of native and invasive populations of C. jubata to identify the geographical origin of invasive populations and to gain insight into introduction pathways. Using nuclear microsatellite markers, we genotyped 235 plants from 22 populations throughout California, 28 plants from the island of Maui, 16 herbarium specimens from New Zealand, and 80 herbarium specimens from Ecuador, Peru, and Bolivia. We detected two clonal genotypes widespread in Ecuador, one in the northern and the second in the southern region. All specimens from Peru and Bolivia and one from southern Ecuador were unique genotypes. Chloroplast DNA sequences were used to characterize the phylogeographic structure of the South American specimens. Together, the chloroplast DNA and microsatellite marker data suggest that South American plants identified as C. jubata consist of multiple closely related asexual lineages. In contrast, all invasive plants from California, Hawaii, and New Zealand consist of a single multi-locus microsatellite genotype that matched a clonal genotype found to be widespread in southern Ecuador.
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1 - University of California, Davis, Plant Sciences, Mail Stop 4, Davis, California, 95616, USA
2 - Stege 1, 39624 Jeetze, , Germany
population genetic structure
Presentation Type: Array
Date: Monday, July 31st, 2006
Time: 1:45 PM