ARTICLE
Analyses of Genetic Variation in Populations of Oregon Chub, a Threatened Floodplain Minnow in a Highly Altered Environment
Patrick W. DeHaan,
Paul D. Scheerer,
Ron Rhew,
William R. Ardren,
Corresponding Author
Patrick W. DeHaan
U.S. Fish and Wildlife Service, Abernathy Fish Technology Center, 1440 Abernathy Creek Road, Longview, Washington, 98632 USA
patrick_dehaan@fws.govSearch for more papers by this authorPaul D. Scheerer
Oregon Department of Fish and Wildlife, Native Fish Investigations Project, 28655 Highway 34, Corvallis, Oregon, 97333 USA
Search for more papers by this authorRon Rhew
U.S. Fish and Wildlife Service, Columbia River Fisheries Program Office, 1211 Southeast Cardinal Court, Suite 100, Vancouver, Washington, 98683 USA
Search for more papers by this authorWilliam R. Ardren
U.S. Fish and Wildlife Service, Western New England Complex, 11 Lincoln Street, Essex Junction, Vermont, 05452 USA
Search for more papers by this authorPatrick W. DeHaan,
Paul D. Scheerer,
Ron Rhew,
William R. Ardren,
Corresponding Author
Patrick W. DeHaan
U.S. Fish and Wildlife Service, Abernathy Fish Technology Center, 1440 Abernathy Creek Road, Longview, Washington, 98632 USA
patrick_dehaan@fws.govSearch for more papers by this authorPaul D. Scheerer
Oregon Department of Fish and Wildlife, Native Fish Investigations Project, 28655 Highway 34, Corvallis, Oregon, 97333 USA
Search for more papers by this authorRon Rhew
U.S. Fish and Wildlife Service, Columbia River Fisheries Program Office, 1211 Southeast Cardinal Court, Suite 100, Vancouver, Washington, 98683 USA
Search for more papers by this authorWilliam R. Ardren
U.S. Fish and Wildlife Service, Western New England Complex, 11 Lincoln Street, Essex Junction, Vermont, 05452 USA
Search for more papers by this authorAbstract
The Oregon chub Oregonichthys crameri is a small floodplain minnow endemic to the Willamette River basin of western Oregon. Historically the species was widely abundant and probably relied on periodic floods for dispersal and genetic exchange among populations. The species has declined substantially in the past 100 years due to habitat alterations and the introduction of nonnative species and is currently listed as threatened under the U.S. Endangered Species Act. Information on the level of genetic variation within and among populations did not exist when the species was listed or when a recovery plan was being developed. In this study, we used a suite of nine microsatellite loci to characterize genetic variation within and among 16 sampling locations and provide information to help guide future recovery efforts. Even though many locations are presently isolated from one another, we observed relatively high levels of genetic variation within collections. Temporal samples revealed that the levels of genetic variation were stable over time despite fluctuations in abundance. Estimates of effective population size (Ne) for three sampling locations ranged from approximately 120 to 220 and suggest that there is no immediate threat from inbreeding or genetic drift. We observed a significant level of genetic variation among sampling locations (global FST = 0.078) and significant differences in allele frequencies among all sampling locations. Our results suggest that the different locations represent distinct populations of Oregon chub and that greater levels of gene flow occur among populations within the Santiam and Middle Fork Willamette River subbasins. The information presented in this study will help guide Oregon chub recovery efforts, including the refinement of recovery areas and future population introduction efforts, and will help address the challenge of managing populations largely in isolation from one another in order to minimize threats from nonnative species.
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- U.S. Fish and Wildlife Service
- Oregon Fish and Wildlife Office
- Columbia River Fisheries Program Office
Publication History
- 28 March 2012
- 28 March 2012
- 17 October 2011
- 16 February 2011
