Hybridization as a Stimulus for the Evolution of Invasiveness in Plants
Gaskin, John , Kazmer, David , Shafroth, Patrick .
Novel hybrids produced since the introduction of saltcedar and the influence of garden plantings on nearby invasions.
SALTCEDARS (Tamarix ramosissima and T. chinensis) are perennial shrubs invading many riparian areas of western North America. Using molecular tools, we investigated how genetic structure differs between native and invasive ranges. Founding events, and perhaps subsequent selection, have created a heterogeneous pattern of saltcedar genotypes across the western North American landscape. Novel hybrid events have occurred between natively allopatric saltcedar species and with other species of the genus (such as athel - T. aphylla) since introduction, potentially influencing host-specific biological control agent herbivory. There is evidence of limited gene flow between garden plantings of saltcedar and the northern Great Plains invasion, but these ornamentals do not appear to be the origin of the invasion.
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1 - USDA Agricultural Research Service, Northern Plains Agricultural Research Laboratory, 1500 N. Central Ave., Sidney, Montana, 59270, USA
2 - U.S. Geological Survey, Fort Collins Science Center, 2150 Centre Ave., Building C, Ft. Collins, Colorado, 80526, USA
Presentation Type: Symposium or Colloquium Presentation
Date: Wednesday, August 2nd, 2006
Time: 10:30 AM