PMID: 12770329May 29, 2003Paper

Larval growth and biosynthesis of reserves in mosquitoes

Journal of Insect Physiology
S E. Timmermann, H Briegel

Abstract

Developmental instars of four species of mosquitoes have been analyzed for growth and synthesis of biomass with respect to their caloric content of protein, lipids, and carbohydrates for each instar of Aedes aegypti and Culex pipiens of the subfamily Culicinae, and Anopheles albimanus, and An. gambiae of the subfamily Anophelinae. The diameter of the thorax grows during the intermolt, reflecting continuous increase in biomass because it correlates significantly with the larval synthesis of total protein, lipids, and carbohydrates. For Ae. aegypti the fourth instar was sexed to disclose the sex-specific synthetic potential. In Ae. aegypti the protein increased in linear proportion with larval body size, whereas lipid synthesis followed a significant, exponential regression, which was clearly steeper in male larvae and most pronounced in the last instar. When normalized for size, the size-specific protein and lipid contents showed minimal levels of 0.25 and 0.1, respectively, regardless of standard or crowded rearing conditions. The rate of lipid synthesis in Ae. aegypti was determined by incubating fourth instar larvae with (14)C-acetate and estimating the lipids. The rate was highest in the early larvae and decreased towards th...Continue Reading

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