Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California.

Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California. Research Abstract Details 

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Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California. Abstract Text:

Miki Okada,Riaz Ahmad,Marie Jasieniuk,Miki Okada,Riaz Ahmad,Marie Jasieniuk,Miki Okada,Riaz Ahmad,Marie Jasieniuk,

International trade in horticultural plants is a major pathway of introduction of invasive species. Pampas grass (Cortaderia selloana) is an invasive species of horticultural origin that is native to South America but cultivated as an ornamental in regions with Mediterranean climates worldwide. To gain insight into the introduction history of invasive populations in California, we analysed microsatellite marker variation in cultivated and invasive C. selloana. We sampled 275 cultivated plants from diverse sources and 698 invasive plants from 33 populations in four geographical regions of California. A model-based Bayesian clustering analysis identified seven distinct gene pools in cultivated C. selloana. Probabilities of assignment of invasive individuals to cultivated gene pools indicated that two gene pools accounted for the genomic origin of 78% of the invasive C. selloana sampled. Extensive admixture between cultivated source gene pools was detected within invasive individuals. Sources of admixed invasive individuals are probably landscape plantings. Consistent with the Bayesian assignment results indicating that multiple cultivated gene pools and landscape plantings are probable sources of invasive populations, F(ST) and neighbour-joining clustering analyses indicated multiple escapes from shared sources in each geographical region. No isolation by distance or geographical trend in reduction of genetic diversity was evident. Furthermore, a generally random and discontinuous distribution of proportional assignments of invasive populations to cultivated gene pools suggests that introductions occurred recurrently within each geographical region. Our results strongly suggest that dispersal through local landscape plantings has contributed to the range expansion of invasive C. selloana in California.

Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California. Publishing Authors By Initials

M Okada,R Ahmad,M Jasieniuk,M Okada,R Ahmad,M Jasieniuk,M Okada,R Ahmad,M Jasieniuk,

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Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Molecular ecology

VOLUME: 16

Page Numbers: 4956-71

Journal Abbreviation: Mol. Ecol.

ISSN: 0962-1083

DAY: 17

MONTH: 10

YEAR: 2007

Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California. Information

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LANGUAGE: eng

NlmUniqueID: 9214478

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Grant and Affiliation Information for Microsatellite variation points to local landscape plantings as sources of invasive pampas grass (Cortaderia selloana) in California.

AFFILIATION: Department of Plant Sciences, Mail Stop 4, University of California, Davis, CA 95616, USA.

Country: England

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MEDLINETA: Mol Ecol

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