Information on population genetic structure and connectivity among populations is essential for the implementation of effective conservation and management strategies for threatened species. The giant Arapaima is one of the most heavily exploited and threatened freshwater fishes in Guyana. Using nuclear microsatellite markers and mitochondrial (mtDNA) sequences (partial 16S rRNA gene, tRNA-Leu gene, and ND1 gene), we evaluated the genetic structure of Arapaima from the Essequibo and Branco (i.e., Amazon) river basins in Guyana. Both markers showed low genetic diversity compared to previously reported studies of Arapaima from the Amazon. Only two mtDNA haplotypes were recovered in Guyana that differed in a single nucleotide position. One was novel and restricted to the Branco basin; the other had previously been reported from the Amazon but, in this study, was restricted to the Essequibo basin. Surprisingly, STRUCTURE analysis of microsatellite markers grouped Arapaima from Guyana into three distinct clusters; one was again restricted to the Branco basin, while the other two were sympatric at multiple sites in the Essequibo basin. This is the first time genetically distinct groups of Arapaima have been found in sympatry at multiple sites. Results have important implications for management of Arapaima and conservation of their genetic diversity.
Skip Nav Destination
Article navigation
Research Article|
November 28 2016
Genetic Diversity and Population Structure of the Threatened Giant Arapaima in Southwestern Guyana: Implications for Their Conservation
L. Cynthia Watson;
L. Cynthia Watson
1Department of Environmental and Forest Biology, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, New York 13210; Email: (LCW) lcynwatson@gmail.com; (DJS) djstewart@esf.edu; and (AMK) annette.kretzer@gmail.com. Send reprint requests to LCW.
2Present address: Watershed Hydrology and Ecology Research Division, Water Science and Technology, Environment and Climate Change Canada, Canada Centre for Inland Waters, Burlington, Ontario L7S 1A1.
Search for other works by this author on:
Donald J. Stewart;
Donald J. Stewart
1Department of Environmental and Forest Biology, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, New York 13210; Email: (LCW) lcynwatson@gmail.com; (DJS) djstewart@esf.edu; and (AMK) annette.kretzer@gmail.com. Send reprint requests to LCW.
Search for other works by this author on:
Annette M. Kretzer
Annette M. Kretzer
1Department of Environmental and Forest Biology, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, New York 13210; Email: (LCW) lcynwatson@gmail.com; (DJS) djstewart@esf.edu; and (AMK) annette.kretzer@gmail.com. Send reprint requests to LCW.
Search for other works by this author on:
Copeia (2016) 104 (4): 864–872.
Citation
L. Cynthia Watson, Donald J. Stewart, Annette M. Kretzer; Genetic Diversity and Population Structure of the Threatened Giant Arapaima in Southwestern Guyana: Implications for Their Conservation. Copeia 1 December 2016; 104 (4): 864–872. doi: https://doi.org/10.1643/CG-15-293
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Sign in via your Institution
Sign in via your InstitutionCiting articles via
Hybridization between the Woodland Salamanders Plethodon cinereus and P. electromorphus Is Not Widespread
Shawn R. Kuchta, Maggie M. Hantak, Brian P. Waldron, Cari-Ann M. Hickerson, Richard M. Lehtinen, Carl D. Anthony
David B. Wake (1936–2021)
Elizabeth L. Jockusch
Bayard Holmes Brattstrom
Marina M. Gerson