Abstract
Following outbreaks of Lymantria dispar (L.) and Euproctis chnjsorrhoea (L.) in New England in the early 1900s, the tachinid Compsilura concinnata (Meigen) was collected from western Europe and released in northeastern Massachusetts in 1906 as a biological control agent. To determine the genotypic variation in populations of C. concinnata in the United States, we surveyed the allozymes in populations endemic to different geographic areas. We examined the genetic structure of C. concinnata populations from Pennsylvania, New York, Maine, Connecticut, and Michigan by electrophoretic analysis of their allozymes. We evaluated genetic variability at 35 loci and found 7 polymorphic loci with 2 alleles per locus. The variability among northeastern populations of C. concinnata was greatest in 3 of 7 polymorphic loci (i.e., I²- esterase, hexoseaminidase , and phosphoglucomutase ). There were no alleles unique to sites and only slight variation in allelic frequencies between sites. The low genetic variability within and among C. concinnata populations suggests there was much homogeneity in the genotypes of the founding colonies. Nonetheless, C. concinnata has established successfully and colonized new habitats.
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