In what season do cicadas usually sing?
It is loudest in summer and midsummer. After autumn, the weather gradually turned cold, and the cicada's cry gradually stopped. It stops in late autumn and winter.
Cicada uses membrane vibration to make sound. The structure of the sound generator is divided into two chambers. The big room has pleated membrane and mirror membrane, and the small room has tympanic membrane. When the muscles in the inner wall of insects contract, the tympanic membrane vibrates to make a sound, which is particularly loud with the help of the mirror membrane and the echo of the singing room.
The humming cicada is a male cicada, and its vocal organ is located at the base of the abdomen, like a drum, which is covered with an eardrum. The eardrum vibrates and makes a sound. Because the vocal cord muscles can expand and contract about 65,438+0,000 times per second, and the gap between the cover plate and the eardrum can play a role of * * *, its singing is particularly loud. And you can take turns singing in different tones. The female cicada is a "dumb cicada" because her musical instrument structure is incomplete and she can't make a sound.
The male cicada keeps singing every day to lure the female cicada to mate. To the female cicada, the male cicada sounds like a wonderful music. After mating and fertilization, the female cicada pricks a row of small holes in the branches with a sword-shaped ovipositor and lays her eggs in the small holes. A few weeks later, both male and female cicadas died.
Due to the change of seasons, the branches withered, fell to the ground and were buried deep in the soil, and the eggs really began to develop and slowly formed larvae. It usually takes 6 months to 1 year to get out of the ground and become an adult. According to research, some larvae can survive in the soil for 6 years before they are unearthed and transformed.
Population classification
There are about 2000 kinds of cicadas. Including cicada (Cryptotympana atrata), centipede (Platypleura kaempferi), cicada (Oncotumpana maculicollis), Yunnan bald-horned cicada (Homoptera), grass cicada, spotted cicada, thin-winged cicada, high-sand bear cicada, Taiwan Province cicada, black-winged cicada and red-eyed cicada. ?
17-year-old cicada: a North American cicada, which has to be drilled underground for 17 years before coming out of its feathers, and belongs to Homoptera. They lie dormant underground for 17 years, then attach branches to shed their skin and mate. The male cicada dies after mating and the female cicada dies after laying eggs.
Scientists explained that this peculiar lifestyle of cicada for seventeen years is to avoid the invasion of natural enemies and safely continue the population, thus evolving a long and secret life cycle. And a thirteen-year-old cicada. This kind of cicada has lived underground for 13 years, second only to cicada for 17 years.
/kloc-in the summer of 0/979, from Carolina to new york in the United States, countless dark bugs flew out of the ground every night, that is, the seventeen-year cicada. They fly to almost all upright targets, such as trees, telephone poles and buildings. Soon, the male cicada made a cheerful and noisy cry to lure the female cicada, which indicated that they had lived underground for 17 years after being born in 1962 and came to the ground to hold a "wedding".
This is the happiest time for other insect-eating animals, and it is a rare feast. But once cicadas climb out of the ground for 17 years, their life span is very short, and all insect-eating animals will scramble to eat these cicadas for 17 years. If it weren't for its numerical superiority, I'm afraid this cicada would have been extinct long ago. ?
The life history of most insects is only one year or less, and the life history of cicadas is only three to nine years.