Journal article
Invasion of Bromus tectorum (L.) into California and the American Southwest: rapid, multi-directional and genetically diverse
Biological invasions, Vol.17(1), pp.287-306
01/2015
Handle:
https://hdl.handle.net/2376/106564
Abstract
The arrival and subsequent spread of the invasive annual grass Bromus tectorum into California and much of the American Southwest was documented by assembling the grass’s early regional collection history in conjunction with analysis of its genetic variation at 25 allozyme loci within 60 widely separated populations. Herbarium records collected ca. 1900, coupled with the distribution of multilocus genotypes, substantiate the view that the invasion of B. tectorum into our study area was rapid, multi-directional, and genetically diverse. The invasion in California and the American Southwest appears to have followed three distinct pathways: (1) direct introduction from native range populations (e.g., the Pgi-2b multilocus genotype), (2) range expansion as descendants of populations in Eastern North America migrated westward (e.g., Pgm-1a and Pgm-2a), and (3) separate introduction(s) into Northern California and Southern Arizona from the Pacific Northwest (e.g., Got-4c). Populations in California and the American Southwest have, on average, lower genetic diversity (A = 1.03, %P = 3.27 and Hexp = 0.007) compared with populations from other regions in North America. Most of this genetic diversity however is partitioned within populations rather than among populations (GST = 0.277). For an introduced species with a broad invasive range, such as B. tectorum in North America, our results indicate that multiple pathways likely contributed to its current (and potentially expanding) geographic distribution.
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Details
- Title
- Invasion of Bromus tectorum (L.) into California and the American Southwest: rapid, multi-directional and genetically diverse
- Creators
- Angela Pawlak - School of Biological Sciences Washington State University Pullman WA 99164 USARichard Mack - School of Biological Sciences Washington State University Pullman WA 99164 USAJeremiah Busch - School of Biological Sciences Washington State University Pullman WA 99164 USAStephen Novak - Department of Biological Sciences Boise State University 1910 University Drive Boise ID 83725-1515 USA
- Publication Details
- Biological invasions, Vol.17(1), pp.287-306
- Academic Unit
- Biological Sciences, School of
- Publisher
- Springer International Publishing; Cham
- Identifiers
- 99900546869601842
- Language
- English
- Resource Type
- Journal article