Are the types of insects in the world getting more and more diverse, and the number of pests getting

Why there are so many kinds of insects - the basic reason.

1) Strong reproductive ability.

The reproductive method of insects is generally that after male and female mate, they lay fertilized eggs and hatch larvae at natural temperatures, which is called sexual reproduction. In most species, a single female can lay hundreds to 1,000 eggs. The queen bee lays up to 2,000 to 3,000 eggs per day.

The queen of termites can lay 60 eggs per second and millions of eggs in their lifetime. If a pair of flies give birth to no dead offspring in the five months of April and August each year, there can be as many as 1,900 billion offspring in a year. In Beijing's climate, a parthenogenetic viviparous cotton aphid can reach more than 6,000 billion offspring in 150 days from June to November.

If these aphids are connected head to tail, they can circle the earth three times. There are also some species of insects that have larval reproduction, ovoviviparity, polyembryonic reproduction, and other fertility methods that are conducive to population expansion.

2) Small size.

The small size of insects gives them a big advantage in the battle for living space. Among insects, the largest body size is only a dozen centimeters, generally within 2 or 3 centimeters, and there are many species to be measured in millimeters or even microns. In an anthill under a stone, tens of thousands of ants can live an orderly social life; A single cotton leaf can be used by hundreds of aphids or whiteflies to live, reproduce and feed.

According to some estimates, 1 hectare of lawn can easily accommodate nearly 600 million jumping insects to live freely.

3) Small amount of food and miscellaneous food.

There are many species of insects that eat a small amount, such as a grain of rice or a bean can make a rice elephant or bean elephant complete the food it needs for the whole process from egg, larva, pupal to adult. The characteristics of miscellaneous food and a wide range of food sources also provide opportunities for insects to survive. The larvae of the dance moth can naturally feed on the leaves of 485 plant species; The Japanese beetle feeds on up to 250 species of plants indiscriminately.

In terms of plant damage, there are 400 species of pests in apple trees; Elm has 650 species of pests; Oak trees have 1,400 species of pests.

Some time ago, there was a very serious locust plague in Africa, including some places in Central Asia. But if you say that emptiness is becoming more and more harmful, this argument is definitely problematic. Because there are some insects that are closely related to human life and rely on the materials produced by human production and living activities to maintain their size, at this time, they may increase the number of slate populations due to the increase of human production and life.

However, the other part will be reduced due to a series of factors such as environmental damage.

Why are insects the most diverse and abundant of animals?

Insecta is the largest class in the animal world.

There are about 1.5 million known species of animals in the world, and insects account for more than 1 million species, accounting for more than 2 3, which is 10 times that of mollusks, 25 times that of vertebrates, more than 100 times that of birds, and 3 times that of all known plant (including bacteria) species (about 10,000 species), and thousands of new insect species are still discovered every year.

Recently, there are still a large number of insects living in the upper layers of the South American rainforest, and their species are far beyond imagination. It is estimated that there may be more than 30 million species of insects in the world.

The number of insects is staggering. A swarm of ants can be as many as more than 500,000, and a swarm of locusts can reach hundreds of millions or even billions of locusts, weighing tens of thousands of tons. The total weight of insects in the world is more than 12 times that of humans.

1. Insects are the only winged animals among invertebrates. Flying allows insects to be more skilled than land animals in foraging, courtship, avoiding predators, and expanding their range.

2. Insects are generally relatively small.

1) The body is small and only needs a small amount of food to complete growth and development. For example, a single cabbage leaf can supply thousands of aphids.

One grain of rice can survive for several rice elephants.

2) The small body is easy to hide, and hundreds of small insects such as aphids, whiteflies, and scale insects can be hidden on the reverse side of a leaf; A family of tens of thousands of ants can be accommodated under a single brick; In a tree cavity, dozens of insects and hundreds of individuals can live together at the same time. The small size also allows food to be its hiding place, thus reaping the benefits of hydration and refuting enemies.

3) The small size is very beneficial to the migration and dispersal of insects. Winged insects can migrate to distant distances with the help of air currents and winds. Even wingless species can be carried to other places by means of birds, beasts and humans because of their small size, which greatly expands their range of life and increases the chances of choosing the environment that is suitable for their survival.