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MBE Advance Access published online on July 28, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msg180
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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Accepted May 19, 2003
© 2003 Society for Molecular Biology and Evolution

Original Articles

Evolution of Clonality and Polyploidy in a Weevil System

Per Stenberg 1*, Magnus Lundmark 1, Stanislaw Knutelski 1, and Anssi Saura 1

1 Dept. of Molecular Biology/Genetics, Umeå University, Sweden

* To whom correspondence should be addressed. E-mail: Per.Stenberg{at}molbiol.umu.se.


  Abstract

The increased interest in asexual organisms calls for in depth studies of asexual complexes that actively give rise to new clones. We present an extensive molecular study of the Otiorhynchus scaber (Coleoptera, Curculionidae) weevil system. Three forms have traditionally been recognized: diploid sexuals, triploid and tetraploid parthenogens. All forms coexist in a small central area while only the polyploid parthenogens have colonized marginal areas. Analyzing the phylogenetic relationship, based on three partial mitochondrial genes, of 95 individuals from 19 populations, we find that parthenogenesis and polyploidy have originated at least three times from different diploid lineages. We observe two major mitochondrial lineages with over 2.5% sequence divergence between the most basal groups within them, and find that current distribution and phylogenetic relationships are weakly correlated. Quite unexpectedly, we also discover diploid clones that coexist with, and are morphologically indistinguishable from, the diploid sexual females. Our results support that these diploid clones are derived directly from the diploid sexuals. We also find that it is mainly an increase in ploidy level and not the benefits of asexual reproduction, which confers to polyploid parthenogens the advantage over their diploid sexual relatives.

Key Words: Clones, Polyploidy, weevil, Otiorhynchus scaber, Parthenogenesis


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