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Journal of Heredity Advance Access first published online on June 5, 2009
This version published online on June 17, 2009
Journal of Heredity, doi:10.1093/jhered/esp025
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© The American Genetic Association. 2009. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Cytonuclear Patterns of Genetic Diversity and the Intricate Evolutionary History of the Inland Silverside (Menidia beryllina)

Kenneth J. Oswald, James M. Grady, and Joseph M. Quattro

From the Department of Biological Sciences, University of South Carolina, Columbia, SC 29208 (Oswald and Quattro); and the Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148 (Grady). Kenneth J. Oswald is now at the Molecular Ecology Research Branch, US Environmental Protection Agency, Cincinnati, OH 45268

Address correspondence to Joseph M. Quattro at the address above, or e-mail: quattro{at}biol.sc.edu.

DNA sequence variation at a mitochondrial and a nuclear intron locus was surveyed within and among multiple populations of the inland silverside (Menidia beryllina) from the southeastern United States and revealed discordant phylogenetic patterns but similar patterns of population genetic variation across nuclear and mitochondrial loci. Mitochondrial variation was geographically structured, with strongly supported monophyletic assemblages among Gulf of Mexico population samples and a close association of the St John's River (SJ) population with these same samples. Nuclear alleles were not strongly structured geographically, with little support for monophyly within or across basins. Conversely, population genetic parameters indicate that the bulk of genetic diversity for both genomes resides within and among Gulf of Mexico populations and that diversity within the Atlantic is largely restricted to the SJ population. The contrast in genetic variation and population phylogenies appears to be a function of historical demographic processes, most likely directed by fluctuating geomorphology of the Florida peninsula in response to North American glaciation cycles.

Key Words: historical demography • mtDNA • nDNA • phylogeography • silverside

Corresponding Editor: Robin Waples

The text has been updated for accuracy.

Received August 12, 2008
Revised March 31, 2009
Accepted April 9, 2009


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