The dragonflies that the post 80s generation played with when they were young, are rarely seen now,

When the post-80s generation was a child, they often played catching dragonflies, but these dragonflies are rare now, what about them? On the one hand, the change of the environment has led to a decrease in the living environment of dragonflies, so dragonflies have also decreased, and on the other hand, the use of pesticides and fertilizers has also led to a decrease in the number of dragonflies, so it is difficult for us to see it now, so let's explain it to you in detail. <>

1. Changes in the living environment have led to a decrease in the number of dragonflies.

When I was a child in the 80s, I often caught dragonflies to play, especially after the rain, there would be a lot of dragonflies out to hunt, and I could catch a lot of dragonflies with a broom, but now there are very few, because dragonflies generally grow on the water surface, and dragonflies point to water means that dragonflies lay eggs on the water, at that time there were many small rivers and streams in the countryside, but now most of our living environment is steel and cement, and there is very little water on the road. So the change in the living environment has also led to a sharp decrease in the number of dragonflies around us. <>

2. The use of pesticides and fertilizers has also led to a decrease in the number of dragonflies.

In order to increase the yield of food, we will use pesticides to remove weeds, we will use pesticides to remove weeds, and we will also use chemical fertilizers to increase the energy of the soil, but this also has ***, because dragonflies mainly grow by eating insects, and we eliminate the insects, so the food of dragonflies will also decrease, so some dragonflies will become extinct after they come out, so we rarely see dragonflies now. But in fact, not all places do not have dragonflies, there are still many dragonflies in the mountains, but the environment we live in is not suitable for the survival of dragonflies. <>

All in all, the dragonflies that the post-80s generation played with when they were children are rarely seen now, because the environment they live in is mainly humid and watery, they will lay eggs on it, and then grow, but now most of the environment we live in is steel and cement, and there is very little water on the road, and now the large-scale use of pesticides and fertilizers has also caused them to lose food and grow space, so the number of dragonflies has become very small.

Dragonflies are slowly disappearing because of environmental problems, and their numbers are decreasing instead of going to **.

Dragonflies are not a threat to humans, it will catch pests such as mosquitoes, moths and flies in the air, which is beneficial to human life, but the life of this animal is inseparable from fresh water, and its ovulation and reproduction have an extremely important relationship with the freshwater environment, and have extremely high requirements for water quality. But now the water source is seriously polluted, and it is no longer suitable for the breeding and growth of dragonflies and habitat, so the number of dragonflies is getting smaller and smaller, so people rarely see dragonflies now.

When water in nature is polluted, the survival of dragonflies is severely challenged. When the water source is polluted, his habitat is destroyed. Now the freshwater environment on which dragonflies depend is getting worse and worse, and the number is getting smaller and smaller, especially freshwater lakes and wetlands, etc., which are constantly disappearing, resulting in sober habitats, and zombies have deprived the Qing court of the opportunity to reproduce, resulting in fewer and fewer dragonflies, and if this development continues, dragonflies may become extinct.

Although the water quality has been controlled in order to maintain the ecological balance and avoid water pollution, because the Qing court has high requirements for water quality and is extremely sensitive, even after purification and treatment, the water quality cannot meet his requirements, so it is difficult for the Qing court to survive in nature. Nowadays, the rivers and lakes in the city are greatly affected by human factors, and there will be a variety of undesirable factors such as wastewater discharge and environmental pollution, which will affect the normal survival of dragonflies, so the number of dragonflies in nature will be less and less, resulting in people rarely seeing it.

From the knowledge introduced above, it can be seen that the dragonfly is not going to **, but the number of dragonflies is much less than a few decades ago, because in the process of social development, freshwater resources continue to decrease, and water pollution has seriously affected the normal habitat and reproduction of dragonflies, and now dragonflies do not have a suitable living environment, resulting in a decrease in the number of eggs it lays, and the number of dragonflies regenerated has also decreased a lot, which is the reason why people feel that it is difficult to see dragonflies, if the water quality is not effectively improved, the number of cool will be less and less, which has the potential to disappear into the long river of history.

I think they all went to the water, because the dragonfly may not be able to stay on land due to the change in the environment, after all, we humans will catch it.

They should all be in the countryside. Or is it already perished. Mainly because the environment is getting worse and worse.

These dragonflies are extinct, because the environmental pollution is very serious now, even in the countryside, dragonflies are rarely seen.

1. In the past, the rural ponds, ditches, and small rivers were all breeding places for dragonfly larvae, and the village ponds were all ownerless, and the villagers could take a bath and wash their clothes there. Later, with the rapid development of the rural aquaculture industry, the ponds in the village were contracted to be used for breeding. The people who raise them will go to the original small river to promote many fish species, lobster fry, etc., and the relative density of stocking is also relatively large.

It stands to reason that there will be no contradiction between breeding and dragonflies, but the larvae of dragonflies also need to be bred in water, and now the relative density of river shrimp in the pond is very large, and these dragonfly larvae, before the nymphs fly over, they have become the food of the river shrimp in the pond. The dragonfly has just laid eggs, but has not yet egged nymphs, and the fish and shrimp in the pond will be eaten clean, which will cause the dragonfly larvae to grow and develop space, which is squeezed.

2. Although there are still some river embankments, reservoirs, and water conservancy hubs in the villages, these are not contracted by local farmers to raise them. But there are also many challenges. With the increase in the utilization rate of packaging bags and other items in rural areas, the domestic garbage disposal in many people's homes is caused by many plastic bags every day.

In the past, there were no garbage stations in the villages, and there were no full-time personnel to clean up the village's domestic garbage on time. The undesirable effect of this is water pollution. The eggs of the dragonfly must be bred in a clean river, and if the water body is polluted, it may cause the dragonfly to breed in another step, and it will be squeezed.

3. The dragonfly will occasionally come to the window of his home, or the car parked on the side of the road, and it will come to hit the glass from time to time. It is because the glass, like water, is transparent, and the dragonflies are not smart, they are all "blind", and for this kind of contemporary craft laminated glass, they are mistaken for a pond. They collide with laminated glass, in fact, they just want to "a few drops of water" on the wall, and they are actually laying eggs.

Glass alone is glass, and although they are all transparent colors, they are not water, and this act of dragonflies can be described as equivalent to "suicide". If you pay attention, you will notice that dragonflies usually have small transparent wings that burst out of the surroundings after colliding with laminated glass, and even dragonflies will be found corpses. This reflects one of the reasons why the widespread use of glass in the countryside has also reduced the number of dragonflies.

Fourth, dragonflies are beneficial insects, they have a very strong ability to catch mosquitoes and flying insects, and most people like dragonflies very much. But there are some people who love dragonflies in another way, and that is to take it. Nymphs and birds are generally not taken by anyone, but dragonfly pupae and larvae, in some rural areas, there is a custom of taking this food.

The larvae of this kind of dragonfly, some people are mercenary, in order to make a profit, they will go to the water to catch these dragonfly larvae, and then sell them to restaurants, or eat them themselves. The adverse effects of this will also lead to the destruction of dragonfly breeding, and a large number of dragonfly larvae will be harvested, and the breeding of the next generation will not be carried out, which will naturally reduce the total number of dragonflies.

Because sometimes farmers will spray some pesticides in order to prevent insects on crops, so these small dragonflies will be poisoned, and the environmental pollution will be more serious, for example, some acid rain will occur, which will also affect his reproduction.

This is because they have less and less space to live and are producing less eggs, so their income is getting less and less.

The current living environment has a lot to do with it. Dragonflies adapt to some unpolluted air, but pesticides are now common in rural areas, so many dragonflies have disappeared.

Habitat destructionDragonflies are sensitive to a variety of environmental factors in their habitats, such as tree concealment, water seasonality, flow velocity, and aquatic plant communities (mainly water-lifting plants). The destruction of habitats by human activities directly affects the survival and reproduction of dragonflies.

Environmental pollution,Studies have shown that insecticide concentrations significantly affect the growth and development of dragonfly larvae. The water pollution and air pollution caused by urban sewage directly affect the environment on which dragonflies depend. Contamination is not suitable for dragonflies on the one hand, and can also lead to genetic mutations in them, both of which can lead to a decrease in the number and variety of dragonflies.

Climate changeIn 2004, the British Dragonfly Society analyzed the phenological observation data of dragonflies from 1960 to 2004 and found that the first flight time of dragonflies (that is, the time when dragonflies begin to fly after emerging in spring and summer every year) is about 15 d, or about 3 d before the first flight time for every 1 increase in annual average temperature.

Studies have proved that dragonflies are sensitive to temperature changes, and the changes in their biological and behavioral characteristics are obviously related to the changes in climate temperature.

The main reason is human interference, the environment in which it lives deteriorates year by year, until it is listed as a 5A scenic spot by the state, and the original stream is completely destroyed.

The extinction of dragonflies in the city is a kind of world du

phenomenon, which is mainly due to zhi

For the dragonfly habitat disappeared version, the dragonfly is a water right insect, its juvenile is living in the water, urban construction has led to the disappearance of many ponds, lakes and streams in the city, the habitat has been destroyed, there is no suitable water environment for life, the dragonfly is naturally gone.

Wood concealment, water seasonality, flow velocity, and aquatic plant communities (mainly water-lifting plants) all affect dragonfly taxa.

Habitat destruction, juvenile living in water, reduction of ponds, disappearance of rivers.

I think most of it is caused by the environment. Occasionally, but rarely, in cities, most of them are still in rural areas. However, with the current air pollution, there is a lot less.

Most are still in rural areas. However, with the current air pollution, there is a lot less.

Because some people bought it for a few dollars, a lot of people in the countryside caught and sold it by the water all day long.

I think it's because the current environment is being destroyed, which has led to a large decrease in dragonflies.

But there are very few, and most of them are still in the countryside. However, with the current air pollution, there is a lot less.

1. Dragonflies live in the water when they are young.

2. Dragonflies are in the air

Direct mating DAO

, and the larvae of dragonflies are.

back to live in the water, therefore.

Answer: When the female dragonfly and the male dragonfly have fun in the water, the common dragonfly touching the water (the tail of the female dragonfly touches the water surface) is the reproductive behavior of the female to lay her eggs in the water. When the larvae mature, they will crawl out of the water, cling to rocks or plants and emerge into adults, and their life history spans both land and water, which can be said to be a good environmental indicator.

In the water! The female dragonfly discharges her eggs in the water! (Science class just started).

The larvae of the dragonfly, whose scientific name is beng, are commonly known as fish-eating tigers.

Dragonfly, invertebrate, insecta, dragonfly, a common name for insects of the suborder Alteroptera. Generally large, the wings are long and narrow, membranous, and the reticulate wing veins are extremely clear. Extremely sensitive vision, 3 in one eye; antennae 1 pair, thin and short; Chewing mouthparts.

The abdomen is elongated, flattened, or cylindrical with an anal appendage at the end. The feet are thin and weak, with hooked spines that catch pests while flying through the air. Juvenile water flies, which breathe in water with the gills of the rectum trachea.

Generally, it takes more than 11 molts, 2 or more years to crawl out of the water along the aquatic weeds, and then finally molt and emerge into adults. In the water, larvae can prey on animals or other small animals, and sometimes cannibalism of their own kind. In addition to a large number of mosquitoes and flies, adult insects can also prey on butterflies, moths, bees and other pests, which are actually beneficial insects.

The larvae of the dragonfly, whose scientific name is beng, are commonly known as fish-eating tigers.

When the dragonfly was a child, it was called the scientific name water pump, and it was commonly known as the fish tiger.

The larvae of dragonflies, which live in water, are scientifically called "water barge".

The larvae of the dragonfly, which lives in the water, are scientifically called 'water barge', and 'fish tiger' is the common name for it.

The larvae of dragonflies, which live in water, are scientifically called "water barge".

Hydrophobeans, which live in water, breathe with gills.

The larvae of dragonflies are called (dragonfly) larvae in the initial stage, and then in the stage after emergence, they are called water flies (pronounced chai) before the adult stage, note that the word "worm" is underneath.

It often inhabits sand, muddy water or aquatic plants in the water, feeds on small animals in the water, such as mayflies and mosquito larvae, and large species can also prey on tadpoles and small fish.