The Asian tiger mosquito, Aedes albopictus (Skuse) (Diptera: Culicidae), invaded eastern North America in 1985 and subsequently spread across a range of ≈14° latitude. We used a common garden, full-sib experimental design to assess population differentiation and quantify within-population genetic variance for larval growth rate, body size (=pupal mass), and preadult developmental period of three populations from each of Florida (≈27° N), Texas (≈29° N), and New Jersey (≈40° N) reared at both 16 and 26°C. Both larval growth rate and body size were affected by a three-way interaction between region (Florida, Texas, and New Jersey), temperature, and sex, indicating that regional differences depended upon both temperature and sex. We found consistent but weak trends toward increased larval growth rate, increased pupal mass, and decreased preadult developmental period in northern relative to southern populations. Among-family (genetic) variance of pupal mass was significantly greater in New Jersey than in Texas and Florida populations at 16°C but not 26°C. Among-family variance for larval growth rate and preadult developmental period did not differ among regions. These results are discussed with respect to the life history evolution of Ae. albopictus across its range in North America.
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Vol. 99 • No. 6