Invasion of Lepidium draba (Brassicaceae) in the western United States: distributions and origins of chloroplast DNA haplotypes

Advances in phylogeography are of great value for understanding the population structure and origins of invasive genotypes. Such insights provide constructive information for current or future biological control research efforts. In this study, we investigated a highly variable chloroplast DNA (cpDN...

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Bibliographic Details
Published in:Molecular ecology 2005-07, Vol.14 (8), p.2331-2341
Main Authors: Gaskin, J.F, Zhang, D.Y, Bon, M.C
Format: Article
Language:English
Subjects:
alleles
Analysis of Variance
Base Sequence
Bayes Theorem
Biogeography
chloroplast DNA
Cluster Analysis
Demography
Deoxyribonucleic acid
DNA
DNA Primers
DNA, Chloroplast - genetics
Gene Frequency
genes
Genetic diversity
Genetic Variation
Genetics, Population
Geography
haplotypes
Haplotypes - genetics
hoary cress
invasion
invasive species
Lepidium - genetics
Lepidium draba
Models, Genetic
Molecular Sequence Data
Nonnative species
nucleotide sequences
origins
Phylogeny
Population Dynamics
population structure
Sequence Analysis, DNA
transfer RNA
United States
Weeds
whitetop
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Summary:Advances in phylogeography are of great value for understanding the population structure and origins of invasive genotypes. Such insights provide constructive information for current or future biological control research efforts. In this study, we investigated a highly variable chloroplast DNA (cpDNA) marker for populations of the weed Lepidium draba (Brassicaceae) in its native Eurasian and invasive US ranges. We sequenced DNA from 684 individuals from Eurasia and the US and found 41 different haplotypes. Our comparative study between the native and invasive ranges showed a 33% reduction in allelic richness (A) and a 7% reduction in haplotype diversity (h) since introduction into the US. Most genetic variation in the native range was observed within geographical regions and populations, not between regions, and this result was similar for the invasive range. Assignment tests indicated the most likely origins of many invasive haplotypes. Some of these occurred in western Europe, supporting an expanded native range that had been proposed for the species. Exact locations were identified for a diverse set of invasive haplotypes which can be used in ongoing host-specificity tests of potential biological control agents.
ISSN:0962-1083
1365-294X
DOI:10.1111/j.1365-294X.2005.02589.x