Abstract
Abstract Anastrepha fraterculus (Wiedmann), a South American fruit fly, is an economically important pest for fruit-bearing plants of the neotropical region. Some evidence indicates that the nominal A. fraterculus comprises multiple cryptic species. In the current work we analyzed genetic variability and structure in Argentine populations of A. fraterculus based on eight isoenzymatic loci and the restriction patterns of a fragment of ≈500 bp belonging to the 16 S mitochondrial ribosomal DNA. The isoenzymatic analysis indicated a significant excess of homozygotes (FIS > 0), due to the fact that sampling sites probably do not constitute stable Mendelian populations. Genetic similarities ranged within values expected for conspecific populations and gene flow, estimated indirectly from the FST value, was high. The phenogram obtained by unweighted pair-group method with arithmetic average among populations shows disagreements with the expected result based on geographic distribution. Populations located in the...
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