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Journal of Heredity Advance Access published online on December 14, 2004
Journal of Heredity, doi:10.1093/jhered/esi010
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© 2005 The American Genetic Association
Received September 10, 2004

Article

Independent Origins of Allotriploidy in the Fish Genus Poeciliopsis

M. Mateos 1 and R. C. Vrijenhoek 1*

1 From the Monterey Bay Aquarium Research Institute (MBARI), Moss Landing, CA 95039

* To whom correspondence should be addressed.
R. C. Vrijenhoek, E-mail: mmateos{at}u.arizona.edu


  Abstract

We examined mitochondrial DNA (mtDNA) sequences and allozymes to assess possible modes of origin, clonal diversity, and evolutionary age in a triploid all-female fish of the genus Poeciliopsis from the state of Sinaloa, Mexico. Analysis of multilocus allozymes revealed that the Río Mocorito biotype (Poeciliopsis monacha-lucida-viriosa) is trihybrid, carrying haploid genomes from three sexually reproducing species, Poeciliopsis monacha, Poeciliopsis lucida, and Poeciliopsis viriosa. Composite allozyme and mtDNA genotypes identified four clones, all bearing closely related mitochondrial haplotypes originally derived from P. monacha. Apparently these trihybrids arose endemically by addition of a haploid genome from P. viriosa, a local sexual species, to an allodiploid biotype, P. monacha-lucida, also found in the Río Mocorito. The present analysis clearly revealed that P. monacha-lucida-viriosa arose independently of the two allotriploid biotypes that live in a river to the north (Río Fuerte). Although the origins of allotriploidy in Poeciliopsis are less constrained phylogenetically and geographically than previously thought, known triploid biotypes all had relatively recent origins, which supports the notion that most asexual lineages are evolutionarily short-lived.


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