Author： Torres-Leguizamón M.
Publisher： Springer Publishing Company
ISSN： 1387-3547
Source： Biological Invasions, Vol.13, Iss.7, 2011-07, pp. : 1505-1519
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Abstract
Tecia solanivora</i> (Lepidoptera: Gelechiidae) is an invasive species that attacks the tubers of the potato Solanum tuberosum</i>. It is considered a serious pest of potato crops and stocks in all countries where it occurs. In the present study, we sequenced 541 individuals sampled across the T. solanivora</i> distribution range, using the mitochondrial DNA marker Cytochrome b (Cytb) to delimit the area of species origin. We also analyzed the genetic structure of T</i>. solanivora</i> in its putative area of origin and described differences in haplotype diversity between samples from different geographic origins affected by the invasion. We observed a gap in the level of genetic diversity between Guatemalan samples (h</i> between 0.77 and 0.97) and those from Costa-Rica, Venezuela, Colombia, Ecuador and the Canary Islands (h</i> between 0 and 0.56). The number of haplotypes has decreased over the colonization process, ending with the observation of a single haplotype in Colombia, Ecuador and the Canary Islands. Consequently, the invasion of South American countries by T. solanivora</i> is likely to have had a front-like step-wise progression, where the most recently invaded country becomes the source of subsequent invasion.
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