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Journal of Heredity Advance Access published online on September 4, 2009
Journal of Heredity, doi:10.1093/jhered/esp078
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© The American Genetic Association. 2009. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communication

Temporal Variation in Population Genetic Structure of a Riverine African Cichlid Fish

Erika Crispo, and Lauren J. Chapman

From the Department of Biology, McGill University, 1205 Avenue Dr Penfield, Montréal, QC, Canada H3A 1B1 (Crispo and Chapman)
Wildlife Conservation Society, 2300 Southern Boulevard, Bronx, NY (Chapman)

Address correspondence to Erika Crispo at the address above, or e-mail: erika.crispo{at}mail.mcgill.ca.

Population genetic structure in a riverine cichlid fish was recharacterized 2 years after patterns had been first described. We found that genetic structure changed, as evidenced by changes in FST between years among sites, significant FST between years "within" sites, and a significant proportion of the genetic variation partitioned between years. Most striking, signatures of isolation by distance were eradicated between years. Our study highlights that point-in-time estimates of population genetic structure might not be valid over longer time periods, particularly in systems exposed to strong seasonal or interannual variation in abiotic conditions.

Key Words: dispersal • isolation by distance • floods • FST • gene flow • genetic divergence

Corresponding Editor: Robin Waples

Received March 17, 2009
Revised July 26, 2009
Accepted August 12, 2009


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