MEPS 469:145-160 (2012)  -  doi:10.3354/meps09980

Expanded mitochondrial control region sequences increase resolution of stock structure among North Atlantic loggerhead turtle rookeries

Brian M. Shamblin1,*, Alan B. Bolten, Karen A. Bjorndal, Peter H. Dutton, Janne T. Nielsen, F. Alberto Abreu-Grobois, Kimberly J. Reich, Blair E. Witherington, Dean A. Bagley, Llewellyn M. Ehrhart, Anton D. Tucker, David S. Addison, Alejandro Arenas, Chris Johnson, Raymond R. Carthy, Margaret M. Lamont, Mark G. Dodd, Michael S. Gaines, Erin LaCasella, Campbell J. Nairn

1Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, Georgia 30602, USA
*Email: *‑Addresses for other authors are given in the Supplement at www.int-res.com/articles/suppl/m469p145_supp.xls

ABSTRACT: The southeastern USA hosts the largest nesting concentration of loggerhead turtles Caretta caretta in the Atlantic. Regionally significant nesting also occurs along the Caribbean coast of Mexico, in Cuba, and in the Bahamas. Previous studies of North Atlantic loggerhead turtle rookeries based on a 380 bp fragment of the mitochondrial control region supported recognition of 8 demographically independent nesting populations (management units) in the Northwest Atlantic in addition to Cape Verde in the eastern Atlantic. Recent analysis of expanded mitochondrial control region sequences revealed additional genetic diversity and increased population structure between western and eastern Atlantic loggerhead turtle rookeries. We sequenced an 817 bp mitochondrial DNA fragment in 2427 samples from nesting beaches in the southeastern USA, Cay Sal Bank, Bahamas, and Quintana Roo, Mexico. Pairwise FST comparisons, pairwise exact tests of population differentiation, and analysis of molecular variance support previously proposed management unit designations and additionally indicate that southeastern and southwestern Florida rookeries should be recognized as distinct management units. Therefore, Northwest Atlantic loggerhead turtle rookeries can be subdivided into 10 management units, corresponding to the beaches from (1) Virginia through northeastern Florida, (2) central eastern Florida, (3) southeastern Florida, (4) Dry Tortugas, Florida, (5) Cay Sal, Bahamas, (6) southwestern Cuba, (7) Quintana Roo, Mexico, (8) southwestern Florida, (9) central western Florida, and (10) northwestern Florida. We confirmed increased resolution of stock structure between many Northwest Atlantic management units and the Cape Verde rookery with the expanded control region haplotypes.


KEY WORDS: Population genetic structure · Marine turtles · Caretta caretta · Mitochondrial DNA


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Cite this article as: Shamblin BM, Bolten AB, Bjorndal KA, Dutton PH and others (2012) Expanded mitochondrial control region sequences increase resolution of stock structure among North Atlantic loggerhead turtle rookeries. Mar Ecol Prog Ser 469:145-160

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