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Aedes Aegypti

Dengue Fever (PowerPoint Fragment)

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Aedes Aegypti

  1. 1. The adult emerges from the pupal case after about two days. The adult ingest air to expand their abdomen. This splits the pupal case allowing the adult to emerge head first. The adults move from the surface of the water to cool, moist areas where they mate and begin the life cycle again. Males and females mate shortly after emerging from their pupal cases. Male mosquitoes live only a few days after mating, feeding on plant nectar until they die. The fertilized female must have one to three blood meals to allow her eggs to mature for laying. Each blood meal takes two to seven days to digest. The female can produce up to 200 eggs per clutch after three blood meals. The number of eggs produced depends on the amount of blood consumed. Each female is capable of producing up to five clutches in her lifetime. Pupa to Adult transition takes approximately 2 days to complete.
  2. 2. Aedes aegypti females usually lay their eggs singly, though they can be laid in a raft. Eggs are laid near water where flooding and raised water levels generally occur. Initially white eggs turn a shiny black color a few minutes after being laid. Eggs can survive several months if desiccated. When wet, the eggs hatch into larvae in two to seven days based upon the climate and temperature. Egg to Larvae transition is approximately 2-7 days.
  3. 3. Mosquito larvae are commonly called "wrigglers" because of their behavior of wiggling when disturbed. Larvae hang head down from the surface of the water with their posterior breathing tube (siphon) extended above the surface for air. The larvae feed on algae and microorganisms filtered from the water by their mouthparts. The larva quickly moves through the first three stages (instars) as they grow rapidly and require molting. The larva stays in the fourth instar stage longer than the previous stages, usually three days under ideal conditions. Ae. aegypti larva can survive up to a month under cold conditions. Egg to Larvae transition is approximately 2 days.
  4. 4. After reaching maturity, the fourth instar enters the pupal stage. The pupa is located on the surface of the water where it breathes through a pair of air tubes or trumpets. This stage of the mosquito is commonly referred to as a "tumbler." The pupae of mosquitoes are mobile and respond to stimuli. The pupae do not feed. They take about two days to mature. Inside the pupal case metamorphosis occurs changing the larval form into an adult with legs, wings, compound eyes, and sucking mouthparts. Larva to Pupa transition is approximately 2 days.