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Genetic structure of smallmouth bass populations from nuclear and mitochondrial DNA sequences.

The smallmouth bass Micropterus dolomieu (family Centrarchidae) is  one of the most popular sport fishes in the lower Great Lakes, with  greatest fishing effort concentrated in Lake Erie.  Prior to this  study, smallmouth bass population structure was little-studied to  date and no prior population genetic investigations based on DNA  sequences were found in a search of the scientific literature or in  the N.I.H. GenBank data base. The Ohio Division of Wildlife (ODW) is  presently focusing on studying the smallmouth bass populations and  harvests on Lake Erie. Our study interfaced with that study and those  being conducted by other management agencies and universities, in  order to assess the genetic diversity and population structure of  smallmouth bass across the Great Lakes, with concentration in Lake  Erie. We specifically tested the hypotheses of whether differences  occurred among population samples in the eastern, central, and  western basins of Lake Erie and among specific spawning sites in  each, in order to assess the distribution of genetic variation. This  genetic survey assisted management agencies in determining the role  of specific spawning sites in contributing to the genetic diversity  of the overall population(s).  Variation at eight nuclear microsatellite DNA loci were analyzed  for 666 smallmouth bass from 28 locations, including 425 individuals  in Lake Erie; as well as Lakes Superior, Huron, and Ontario, and  outgroups from the Mississippi, Ohio, St. Lawrence, and Hudson River  drainages.  Results revealed marked genetic differences among lake  and river populations, as well as surprisingly high divergences among  closely spaced riverine sites. Genetic relationships were consistent  with hypotheses regarding divergent origins through vicariance in  glacial refugia, followed by colonization pathways establishing  modern-day Great Lakes populations, and maintenance through  behavioral site fidelity. Conservation management practices thus  should preserve genetic identity and unique characters among  smallmouth bass populations. 

Status
In progress
Type
Project
Start Date
End Date
Researchers
Carol StepienPrincipal Investigator
Associated with 4 projects
Agencies
Ohio Sea Grant College Program $ 147,003.00USDEstimates

Funding 15 projects for a total of $599,045.00
State of Ohio $ 76,393.00USDEstimates

Funding 8 projects for a total of $223,131.00
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Organism
Population
Processes
Natural Ecological Processes
Natural Physical/Geological Processes
Land Use and Habitat
Shoreline
Wetlands
Resource Management
Fisheries
Wildlife
Lake Basin Connecting Channels
Detroit River
Lake Erie
Lake Huron
Lake Michigan
Lake Ontario
Lake St. Clair
Lake Superior
Out of Basin
St. Clair River
St.Lawrence River
State Province
Illinois
Indiana
Michigan
Minnesota
New York
Ohio
Ontario
Pennsylvania
Quebec
Wisconsin
Purpose of Project
Resource Management
Frequency
Annual
Number of Sampling Entities
20-49
Region Being Monitored
Coastal Wetlands
Near and OpenShore Waters
Tributary Mouth
Resource Being Monitored
Fisheries
Habitat
Wildlife
Beneficial Use Impairment Assessments
Loss of Fish and Wildlife Habitat
Annex Numbers
Research & Development
Surveillance and Monitoring
Annex 17
Cause-effect inter-relationships of productivity and ecotoxicity
Impact of water quality and AIS on fish and wildlife populations and habitats
General
Monitoring
Annex
  • Annex Numbers
    Annex Numbers
    Research & Development
    Surveillance and Monitoring
  • Annex 17
    Annex 17
    Cause-effect inter-relationships of productivity and ecotoxicity
    Impact of water quality and AIS on fish and wildlife populations and habitats

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Great Lakes - St. Lawrence Region.