Mosquito Biology

Mosquito Biology

 

Mosquito Life Cycle

 

Mosquito Egg

 

Many mosquitoes, such as Culex quinquefasciatus, lay their eggs on the surface of fresh or stagnant water.  The water may be in tin cans, barrels, horse troughs, ornamental ponds, swimming pools, puddles, creeks, ditches, catch basins, or marshy areas.  Mosquitoes prefer water sheltered from the wind by grass and weeds.

 

Mosquito Egg Raft

Culex mosquitoes usually lay their eggs at night over a period of time sticking them together to form a raft of from 100 to 300 eggs.  A raft of eggs looks like a speck of soot floating on the water and is about 1/4 inch long and 1/8 inch wide.  A female mosquito may lay a raft of eggs every third night during its life span.

Anopheles and many other mosquitoes lay their eggs singly on the water surface.  Aedes and Ochlerotatus mosquitoes lay their eggs singly, usually on damp soil.  Aedes and Ochlerotatus eggs are more resistant to drying out (some require complete drying out before the eggs will hatch) and hatch only when flooded with water (salt water high tides, irrigated pastures, tree holes flooded by rains, flooded stream bottoms).

Anopheles, Culex and Mansonia eggs are susceptible to drying out during extended droughts.

Tiny mosquito larvae (1st instar) emerge from the eggs within 24 - 48 hours almost in unison.

 

Mosquito Larva

Mosquito larvae, commonly called "wigglers," live in water from 4 to 14 days depending on water temperature.

Larvae of almost all species must come to the surface at frequent intervals to obtain oxygen through a breathing tube called a siphon.  Larvae of Coquillettidia and Mansonia possess modified siphons that allow them to pierce the stems of emergent vegetation in water and draw their oxygen from the plant in this process.  Larvae are constantly feeding since maturation requires a huge amount of energy and food.  They hang with their heads down and the brushes by their mouths filtering anything small enough to be eaten toward their mouths to nourish the growing larvae.  They feed on algae, plankton, fungi, bacteria, and other microorganisms.  They breathe at the water surface with the breathing tube up breaking the water surface tension.  The larvae of a few mosquito species are cannibalistic, feeding on larvae of other mosquitoes: Toxorhynchites and some Psorophora, the largest mosquitoes known, are predators of other mosquito larvae sharing their habitat.  Their larvae are much larger than other mosquito larvae.

During growth, the larva molts (sheds its skin) four times.  The stages between molts are called instars.  At the 4th instar, the usual larva reaches a length of almost 1/2 inch and toward the end of this instar ceases feeding.  When the 4th instar larva molts, it becomes a pupa.

 

Mosquito Pupa

Mosquito pupae, commonly called "tumblers”, live in water from 1 to 4 days, depending upon species and temperature.

The pupa is lighter than water and therefore floats at the surface.  It takes oxygen through two breathing tubes called "trumpets.”  The pupa does not eat, but it is not an inactive stage.  When disturbed, it dives in a jerking, tumbling motion toward protection and then floats back to the surface.

The metamorphosis of the mosquito into an adult is completed within the pupal case.  The pupal case thus serves as a factory wherein the mosquito makes an adult out of a larva.  The adult mosquito splits the pupal case and emerges to the surface of the water where it rests until its body dries and hardens.

 

Mosquito Adult

Only female mosquitoes require a blood meal and bite animals - warm or cold blooded - and birds.  Stimuli that influence biting (blood feeding) include a combination of carbon dioxide, temperature, moisture, smell, color, and movement.  Male mosquitoes do not bite, but feed on the nectar of flowers or other suitable sugar source.  Acquiring a blood meal (protein) is essential for egg production, but mostly both male and female mosquitoes are nectar feeders for their nutrition.  Female Toxorhynchites actually can't obtain a bloodmeal and are restricted to a nectar diet.  Of those female mosquitoes capable of blood feeding, human blood meals are seldom first or second choices.  Horses, cattle, smaller mammals, and/or birds are preferred.

Aedes and Ochlerotatus mosquitoes are painful and persistent biters.  They search for a blood meal early in the morning, at dusk (crepuscular feeders) and into the evening.  Some are diurnal (daytime biters) especially on cloudy days and in shaded areas.  They usually do not enter dwellings, and they prefer to bite mammals like humans.  Aedes and Ochlerotatus mosquitoes are strong fliers and are known to fly many miles from their larval developments sites.

Culex mosquitoes are painful and persistent biters also, but prefer to attack at dusk and after dark.  They readily enter dwellings for blood meals.  Domestic and wild birds usually are preferred over man, cows, and horses.  Culex nigripalpus is known to transmit St. Louis encephalitis to man in Florida.  Culex mosquitoes are generally weak fliers and do not move far from home, although they have been known to fly up to two miles, Culex usually live only a few weeks during the warm summer months.  Those females that emerge in late summer search for sheltered areas where they "hibernate" until spring.  Warm weather brings them out again in search of water on which to lay their eggs.

Culiseta mosquitoes are moderately aggressive biters, attacking in the evening hours or in the shade during the day.  Psorophora, Coquillettidia and Mansonia mosquitoes are becoming more pestiferous as an ever-expanding human population invades their natural habitats.  Anopheles mosquitoes are persistent biters and are the only mosquitoes which transmit malaria to man.

Life Cycle

The mosquito goes through four separate and distinct stages of its life cycle: Egg, Larva, Pupa, and Adult.  Each of these stages can be easily recognized by its special appearance. 

Egg: Eggs are laid one at a time or attached together to form "rafts.”  They float on the surface of the water.  In the case of Culex and Culiseta species, the eggs are stuck together in rafts of up to 200.  Anopheles, Ochlerotatus and Aedes, as well as many other genera, do not make egg rafts, but lay their eggs singly.  Culex, Culiseta, and Anopheles lay their eggs on the water surface while many Aedes and Ochlerotatus lay their eggs on damp soil that will be flooded by water.  Most eggs hatch into larvae within 48 hours; others might withstand subzero winters before hatching.  Water is a necessary part of their habitat.   

Larva: The larva (plural - larvae) lives in the water and comes to the surface to breathe.  Larvae shed (molt) their skins four times, growing larger after each molt.  Most larvae have siphon tubes for breathing and hang upside down from the water surface.  Anopheles larvae do not have a siphon and lie parallel to the water surface to get a supply of oxygen through a breathing opening.  Coquillettidia and Mansonia larvae attach to plants to obtain their air supply.  The larvae feed on microorganisms and organic matter in the water.  During the fourth molt, the larva changes into a pupa. 

Pupa: The pupal stage is a resting, non-feeding stage of development, but pupae are mobile, responding to light changes and moving (tumble) with a flip of their tails towards the bottom or protective areas.  This is the time the mosquito changes into an adult.  This process is similar to the metamorphosis seen in butterflies when the butterfly develops - while in the cocoon stage - from a caterpillar into an adult butterfly.  In Culex species in the southern United States, this takes about two days in the summer.  When development is complete, the pupal skin splits and the adult mosquito (imago) emerges. 

Adult: The newly emerged adult rests on the surface of the water for a short time to allow itself to dry and all its body parts to harden.  The wings have to spread out and dry properly before it can fly.  Blood feeding and mating does not occur for a couple of days after the adults emerge.

How long each stage lasts depends on both temperature and species characteristics.  For instance, Culex tarsalis, a common California (USA) mosquito, might go through its life cycle in 14 days at 70° F and take only 10 days at 80° F.  On the other hand, some species have naturally adapted to go through their entire life cycle in as little as four days or as long as one month.

References

American Mosquito Control Association

http://www.mosquito.org/