Why are mosquitoes so poisonous in autumn?

As the saying goes, "the autumn mosquito is as fierce as a tiger", why do mosquitoes come to autumn as if they had added buff?

Mosquitoes themselves prefer autumn.

Mosquitoes are also afraid of heat, but to survive, they have to work under high temperatures, just as we do.

In fact, the temperature most suitable for mosquito survival and reproduction is 20 to 30 degrees Celsius, and the most suitable humidity is about 70%. So after a few autumn rains, the temperature drops to 20 to 30 degrees, and with the moist air after the rain, the mosquito lives more moisturizing. It's natural to bite people more vigorously.

In addition, because there will be a lot of water after the rain, the more water, mosquito spawning more places.

Moreover, the water in autumn is more suitable for mosquito hatching than in summer, which is due to heavy rain in summer, rapid flow of Rain Water and poor swimming skills of mosquito larvae, so the survival rate is low.

Autumn rainstorms reduce, water is basically no flow, and a lot of bacteria, naturally became a breeding ground for mosquito hatching.

Breeding season, big appetite

Because of the suitable temperature and humidity, the Beginning of Autumn then entered the peak of mosquito breeding in the year. Like our baby, mosquitoes also need more nutrition to lay their eggs. Only after a full meal of blood, the ovaries of female mosquitoes develop, can lay eggs smoothly.

Therefore, under the need of species survival and reproduction, mosquitoes will seize every opportunity to desperately "mouth."

On the one hand, female mosquitoes can survive for eggs crazy "mending", on the other hand, the Earth's warming climate, may also have created an army of Anopheles.

A study by ecologists at Oregon State University on climate and mosquito hibernation habits found that the warmer autumn of the Earth meant that the onset of hibernation was delayed.

Researchers began collecting data on animals during the winter in the early 1970 s. The results showed that today's mosquitoes wait an average of about 10 days longer than they did in 1972 before entering hibernation.

Mosquito blood sucking is not terrible, the terrible thing is that it spits.

Some people feel that autumn mosquitoes bite the package more itching, this is because mosquitoes while sucking blood, but also spit at you.

In general, it takes a mosquito a dozen seconds to make a successful bite.

In order to prevent the host blood from clotting in the course of blood sucking, female mosquitoes also inject saliva into the wound from the salivary gland in the mouth, that is, saliva.

Mosquito saliva contains anticoagulant and anaesthetic ingredients that prevent blood from clotting and sucking out, as well as imperceptible to bitten people.

Anticoagulants stimulate my immune system to release a substance called histamine, which stimulates skin nerve endings and causes redness, swelling and itching.

Because mosquitoes have more appetite, more blood, more spit, and more histamine released by the natural immune system, we feel more itchy.

Of course, itching is only a slight negative effect, and the real problem is the pathogen in mosquito saliva.

If mosquitoes carry mosquito-borne pathogens such as malaria parasites, dengue viruses, and so on, the pathogens can slip quietly into the host with saliva, according to scientists at the University of Brook Research Center.

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