Abstract
The presence of a widespread exotic raises the question as to whether the successful invasion can be attributed to spread after a single introduction or is the product of multiple introductions. The plains killifish, Fundulus zebrinus, is native to the western Great Plains of the United States but is also found throughout the Colorado River basin. We surveyed five introduced populations for genetic variation in allozymes and mitochondrial DNA (mtDNA) in order to compare the genetic structure of these populations with those from across the native range. Our survey revealed two genetically distinct stocks of introduced F. zebrinus, one in the San Juan and one in the Yampa and Colorado drainages. Each stock corresponds to at least one unique introduction event. In addition, data available from a genetic survey of the native range allowed us to identify the sources of these introduced populations. The combination of allozyme and mtDNA data for the San Juan population indicated that the most probable source for this population was the Pecos drainage of New Mexico and Texas. The Yampa and Colorado populations seem to be derived from the western Arkansas drainage, although the allozyme data indicated that another nearby drainage(s) might have also served as a source for the Colorado population.
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Kreiser, B.R., Mitton, J.B. & Woodling, J.D. Single Versus Multiple Sources of Introduced Populations Identified With Molecular Markers: A Case Study of a Freshwater Fish. Biological Invasions 2, 295–304 (2000). https://doi.org/10.1023/A:1011490203448
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DOI: https://doi.org/10.1023/A:1011490203448