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Journal of Heredity Advance Access originally published online on January 21, 2008
Journal of Heredity 2008 99(2):223-226; doi:10.1093/jhered/esm102
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communications

A Tetraploid Amazon Molly, Poecilia formosa

Kathrin P. Lampert, Dunja K. Lamatsch*, Petra Fischer, and Manfred Schartl

From the Department of Physiological Chemistry I, University of Wuerzburg, Biozentrum, Am Hubland, 97074 Wuerzburg, Germany (Lampert, Lamatsch, Fischer, and Schartl); and the Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK (Lamatsch)
* D.K.L. contributed equally to the work

Address correspondence to K. P. Lampert, Department of Evolutionary Ecology and Biodiversity of Animals, University of Bochum, 44803 Bochum, Germany, or e-mail: kathrin.lampert{at}ruhr-uni-bochum.de.

Polyploidization is thought to be an important driving force in evolution as it increases the genetic material on which mutation and selection can act. In the Amazon molly, Poecilia formosa, triploid genotypes can be found in the field and frequently arise from diploid breeding stocks, a tetraploid individual, however, was so far never documented. Here, we report the first tetraploid Amazon molly. Flow cytometry clearly showed the tetraploid DNA content, whereas microsatellite analysis not only confirmed the tetraploidy but also pointed to allotetraploidy. Most likely the fourth genome was received through paternal leakage, namely, by fertilization of a triploid egg with a haploid sperm. The existence of tetraploid individuals offers new explanations for the enormous clonal diversity observed in wild populations of P. formosa.

Corresponding Editor: Lisa Seeb


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