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Conservation Genetics

, Volume 19, Issue 1, pp 57–69 | Cite as

Introgressive hybridization and species turnover in reservoirs: a case study involving endemic and invasive basses (Centrarchidae: Micropterus) in southeastern North America

  • Max R. BangsEmail author
  • Kenneth J. Oswald
  • Thomas W. Greig
  • Jean K. Leitner
  • Daniel M. Rankin
  • Joseph M. Quattro
Research Article

Abstract

Invasive species threaten native taxa with extirpation and extinction via several biological mechanisms. One such mechanism, hybridization and subsequent introgression of invasive alleles into native genomes is a serious concern, especially for taxa displaying weak reproductive barriers, as is the case for black basses. Black basses introduced outside of their native ranges thus pose elevated threats to endemic congeners, particularly in the southern United States where restricted ranges preclude refuge from introgression. The recently delineated Bartram’s bass (M. sp. cf M. coosae) is endemic to the upper regions of the Savannah River basin, throughout which anthropogenic modification, including impoundment, has been extensive. Non-native Alabama bass (M. henshalli) and smallmouth bass (M. dolomieu) have been introduced into this system on multiple occasions and now threaten Bartram’s bass via introgression. In this study we sampled four reservoirs (Jocassee, Keowee, Hartwell, and Russell) in the upper Savannah River during 2004 and 2010. Results from three codominant nuclear loci and one mitochondrial locus revealed extensive introgression between Alabama and Bartram’s bass. Results show that Alabama bass have replaced Bartram’s bass in lakes Keowee and Russell, where they were first introduced, while the frequencies of hybrids in lakes Jocassee and Hartwell are increasing. Hybridization involving Bartram’s bass with native largemouth bass and introduced smallmouth bass was detected in very low frequencies. Results highlight the importance of continual study over geographic and temporal scales to inform management and conservation of rare fishes threatened with extinction via interspecific hybridization.

Keywords

Hybridization Introgression Micropterus Savannah River Invasive species 

Notes

Acknowledgements

The authors acknowledge Vic Blackwell, Mike Wilson, Terry Bryant, Amy Breedlove, Treye Byars, Drew Robb and Weston Houck of South Carolina Department of Natural Resources for their assistance in fish collections, and Dr. Michael Douglas of the University of Arkansas for his editorial input.

Disclaimer

The scientific results and conclusions, as well as any opinions expressed herein, are those of the author(s) and do not necessarily reflect the views of NOAA or the Department of Commerce. The mention of any commercial product is not meant as an endorsement by the Agency or Department.

Supplementary material

10592_2017_1018_MOESM1_ESM.docx (33 kb)
Supplementary Table (DOCX 33 KB)
10592_2017_1018_MOESM2_ESM.pptx (70 kb)
Supplementary Fig. 1 Map of sample sites used in the reference database. (PPTX 70 KB)

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Max R. Bangs
    • 1
    • 6
    • 7
    Email author
  • Kenneth J. Oswald
    • 2
  • Thomas W. Greig
    • 3
  • Jean K. Leitner
    • 4
  • Daniel M. Rankin
    • 5
  • Joseph M. Quattro
    • 1
  1. 1.Department of Biological Sciences, Marine Science ProgramUniversity of South CarolinaColumbiaUSA
  2. 2.Department of Biological and Allied Health SciencesOhio Northern UniversityAdaUSA
  3. 3.Center for Coastal Environmental Health and Biomolecular Research at CharlestonCharlestonUSA
  4. 4.South Carolina Department of Natural ResourcesFreshwater Fisheries ResearchEastoverUSA
  5. 5.South Carolina Department of Natural ResourcesFreshwater Fisheries Region OnePendletonUSA
  6. 6.School of Fisheries, Aquaculture and Aquatic SciencesAuburn UniversityAuburnUSA
  7. 7.Department of Biological SciencesUniversity of ArkansasFayettevilleUSA

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