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Comparison of Ornamental and Wild Saltcedar (Tamarix Spp.) Along Eastern Montana, USA Riverways Using Chloroplast and Nuclear DNA Sequence Markers
- Saltcedars (Tamarix ramosissima, T. chinensis, and their hybrids) have invaded riverways and lakeshores across the western USA and northern Mexico. In Montana, ornamental plantings of saltcedar have been hypothesized, to varying degrees, to be the origin of nearby, wild populations. To examine this hypothesis, we compared chloroplast and nuclear DNA sequences from 36 ornamental and 182 wild saltcedars from Montana, North Dakota, and Wyoming, USA. We found that ornamental and wild population genotype frequencies were highly dissimilar. Also, genotype frequencies of hypothetical propagule populations under scenarios of random mating, self-fertilization, and clonal reproduction in the ornamental population were highly dissimilar to the genotype frequencies of the wild populations. Assignment tests indicated that the majority of wild genotypes originated from other wild plants, not from ornamental plants. However, ornamental plants could not be excluded as contributors to wild populations because all chloroplast and nuclear haplotypes found in the ornamental plants were found at some frequency in the wild. These findings suggest that while ornamental saltcedars are not the sole source of wild saltcedar, they do have potential to contribute genetic material to an invasion or re-establish a population after existing wild saltcedars are removed.
Gaskin, J.F. , Kazmer, D.J.
Tamarix ramosissima , Tamarix chinensis , hybrids , ornamental plants , DNA , chloroplast DNA , nucleotide sequences , introduced species , genetic markers , genotype , trees , shrubs , population dynamics , riverine habitat , noxious weeds , wild plants , Montana , North Dakota , Wyoming
- Includes references
- Wetlands : the journal of the Society of the Wetland Scientists 2006 Dec., v. 26, issue 4
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.