Why are there fewer frogs and more rats?

Frogs are all cooked. Is it likely that rats have a good harvest or that natural predators (cats, cats, eagles, snakes, etc.) are also on the human table?

Because frogs have more natural predators, and rats have fewer natural predators.

Mice eat frogs.

The frog has no teeth, it eats by swallowing, and it can't eat food the size of a mouse, and the mouse generally eats the frog when it hibernates, and if the frog doesn't hibernate, the mouse can't catch the frog.

The feeding habits of rodents are determined by the food source and environment. House-dwelling rats depend on humans for their livelihood, and they can eat any food that mortals can eat, even plastics, candles, soap, garbage, insects, etc., and they can accept sour, sweet, salty, and spicy foods, and they are not completely resistant to bitter foods.

However, all kinds of rodents have obvious preferences, generally domestic rats like to eat cereals, grain products, potatoes, sugarcane, shallots, celery and most of the strong foods, wild mice mainly eat grain, grass, grass seeds, fruits and other vegetarian food. Rodents eat watery foods in dry, food-rich places (e.g., granaries).

It depends on what kind of frog and what kind of rat, there are very fierce big frogs eating mice, and there are insectivorous rats eating small frogs.

But in general, rats that eat small frogs are also very rare.

It doesn't matter to them, no one eats anyone, they don't have a share of the food chain.

Frogs don't eat mice. Frogs only eat insects.

There are too many pesticides, and there is so little rain in the summer, and there is less and less land in the countryside, and it's hardening.

As you may have noticed, we rarely see frogs by small rivers and ponds nowadays. But listen to Mom and Dad, when they were kids, there were many more frogs than there are now. What's going on?

This is the reason for the mass extinction of living things. The extinction of many organisms has a lot to do with the change and destruction of the natural environment caused by human activities. Secondly, indiscriminate hunting, overutilization, and environmental pollution are also important factors.

Some people hunt frogs to make dishes on the table, rivers in some places already contain a lot of toxins, and the warming climate is the reason why there are fewer frogs.

There are fewer frogs in the countryside than in the cities! At first glance, it sounds incredible. But if you take a walk around Jinxin Road in the city at night and take a look at the surrounding countryside, you will find that this is an indisputable fact.

The reporter learned that due to many reasons such as pollution of the ecological environment and over-hunting, there are fewer and fewer wild frogs in rural fields, and almost all of them are farmed frogs on the market. The idyllic scenery of "grass ponds full of frogs" has become more and more distant from people.

It's hard to see a frog in the field now," an old farmer in his 60s who is working in the field in Yujiao Village, Chenghai City, told reporters. According to the old farmer, when he used to work in the fields, frogs could be seen almost everywhere, especially in early summer, when the countryside had the most frogs, and when he was in the yard every night, the frogs always cried non-stop, and the frogs heard one after another. "But in the last decade or so, the sound of frogs in the countryside has become more and more sparse, and there are fewer and fewer frogs to be seen in the fields.

According to the old farmer, the main reason for this phenomenon is the heavy use of pesticides in the planting process and the excessive killing of frogs.

Compared with the decreasing number of frogs in the countryside, there are more frogs in the cities, and they often appear on the tables of citizens and become a delicacy for people. In Jinxin Road in the urban area, the reporter found that there were five or six roadside stalls selling frog porridge every night. According to the owner of one of the stalls, dozens of frogs are eaten every night.

Are these frogs all from **? "All the frogs are farmed, and now there are almost no frogs left in the wild. The boss told reporters.

There are fewer and fewer wild frogs in the countryside and more and more frogs on the urban table, and many people may not realize that they are also destroying the ecological balance while feasting.

Various herbicides, pesticides, and pesticides are used in the farmland, and these chemicals have also caused a catastrophe to the frogs. Naturally, there are fewer and fewer frogs.

Frogs don't eat mice. Frogs have no teeth and eat by swallowing, so frogs can't eat food the size of a mouse. Frogs often inhabit rivers, ponds, and rice paddies, and are mainly found in the grass near the water, but sometimes they can also lurk in the water.

Most of them are active at night, eating insects as their staple food, and also eating some snails, snails, small shrimp, small fish, etc.

Frogs belong to the amphibians of the phylum Chordates, amphibians, tailless, frogs, adults without tails, eggs laid in water, fertilization in vitro, hatching into tadpoles, respiration with gills, after mutation, adults mainly use lungs to breathe, and also use ** breathing. The vast majority of frogs reproduce through in vitro fertilization, and the fertilized eggs hatch into tadpoles outside the mother's body. The upper jaw has teeth, usually vomer teeth.

shoulder girdle fixed thoracic type, vertebral body uneven type, recommended vertebral transverse process columnar; There is no intermediated cartilage between the two bone nodes at the end of the toes. The tympanic membrane is distinctly hidden under the skin,** smooth or with wart grains. The tongue is generally oblong, and the posterior end is mostly notched.

I remember that in our rural hometown, it has always been a place with a very good environment, with mountains and rivers, and rich resources and species. In spring and summer, the fields are full of frog sounds, and at night there are frogs chirping again and again, and they all fall asleep to the chirping of various insects, and the air is very clear in this environment of wowing birds. There are also a lot of loaches and yellow eels in the field, and there are many small shrimp and fish in a small ditch.

There are fewer and fewer frogs in rural fields, mainly due to the following reasons:

1. Excessive capture.

Over-catching of wild animals in rural areas is a common occurrence. Whether it is frogs or other animals, in the countryside there is basically an over-hunting, which causes these animals to gradually decline or die. For example, some farmers raise a lot of ducks, want to let the ducks add nutrients, but have no money to buy feed, and then think of catching frogs back to feed the ducks, because ducks eat frogs, and ducks feed frogs not only grow fast but also have good meat quality.

Another is that people nowadays are more and more fond of eating game, and feel that wild animals are very nutritious, and frogs are no exception, so catching and buying frogs has become a hot spot. As a result, there are fewer and fewer frogs, but frogs are now forbidden to be captured, and I hope that everyone will not damage the ecological environment.

2. Excessive use of pesticides.

As we all know, the countryside is a vast place for planting agriculture, and pesticides are indispensable for planting a certain kind of crops, because crops must be sprinkled regularly on plants in order to prevent pests, such as rice, corn, peanuts, etc. Another is for weeding, and herbicides are very lethal. It is precisely because this problem exists in many rural places, so the loach eel in the field, the snail and shrimp in the ditch are poisoned by pesticides, and frogs are no exception, because frogs are terrestrial animals, not only in the water and on land can move, so once they are poisoned by pesticides, frogs are bound to die, fundamentally so that they can not breed offspring, resulting in fewer and fewer.

Third, the environment is seriously polluted.

With the rapid development of many rural areas, many factory owners choose to build factories in rural areas, and now there are all kinds of small workshops and small factories in rural areas. The waste waste or wastewater they use is discharged directly into the wild, directly into the farmland. Although the rice planted in the farmland grows well, people don't actually eat it, but at most they sell it.

Because these polluting heavy metals must be exceeded. Therefore, the environment is seriously polluted, and the animals such as frogs that depend on the environment and survival will definitely gradually disappear.

In short, there are fewer and fewer frogs in the field, which are inseparable from the above three reasons, but the important point is to over-capture, for the sake of the beautiful rural environment, we at least do not catch it, after all, frogs are now forbidden to be fished.

Because of the change in the environment now. In many places, the rivers are dry and not suitable for frogs, and now there are too many pesticides and there is not enough food.

Because the environment in the countryside is not so good now, there are fewer and fewer of them.

Because the environmental pollution is particularly serious now, the water has dried up in many places in the countryside, so there will be fewer and fewer frogs, and the second is because people use a lot of pesticides, they will reduce reproduction after eating, which is also an important factor in the reduction of frogs.

Test Topic: Ecosystems have a certain ability to self-regulate Special Topic: Analysis:

From the knowledge learned, we can know that: (1) in an ecosystem, organisms are mutually restricted, and it is precisely because of this constraint that the number and proportion of various organisms will be relatively stable, that is, the ecosystem has a certain ability to self-regulate (2) A large number of snakes and frogs are killed in the question stem, so that the number of aphids and rats increases, and the number of rice decreases, and the decrease in rice reduces voles due to lack of food, so snakes also decrease In addition, the killing of a large number of frogs also leads to a decrease in snakes due to lack of food According to this, this question can be answered A large number of guess pants to kill frogs, the number of aphids increases, so the rice aphid pests are serious, the killing of snakes increases the number of mice, and the rice is seriously damaged, indicating that the ecosystem has the ability to self-regulate, and the various components of the ecosystem are interdependent and mutually restricted, and any kind of organism in the ecosystem must be affected by other biological factors, which does not indicate that there is an energy cycle in the ecosystem Therefore, it is selected:d Comments:

The key to this question is to understand the logical relationship between various organisms

Frogs are amphibians seen as an accurate barometer or indicator of environmental hygiene, and most of the amphibian species have declined on the planet, and the blame for the fact that living species are also fast becoming endangered is to blame for many things. The most important of these is the frequent human activities and the rapid development of global industry, which on the one hand leads to the extinction of species, and on the other hand, due to industrial pollution, especially the chemical industry, the deterioration of the ecological environment is intensifying, and the wetlands are being destroyed on a large scale. Perhaps the responsibility for the decline in amphibian populations worldwide is the reduction in ozone, the thinning of the Earth's ozone layer and the rise in ultraviolet radiation, preventing amphibian eggs from hatching into larvae.

Other amphibians most likely to be affected by the increased effects of ultraviolet radiation are those that live in colder temperatures, closer to the polar regions, where the ozone layer is the thinnest and where amphibians must bask in the sun to regulate their body temperature, resulting in increased exposure to radiation and destruction of DNA molecules. Environmental hormones may also be responsible for the decline in global amphibian populations, and pollutants broken down by pesticides such as DDT have the potential to wreak havoc on amphibians' reproductive capacity, similar to those seen in aquatic organisms such as fish and crocodiles. In fact, this environmental hormone has been found to masculinize some female tree frogs, as well as other species of male tree frogs, with the result that none of these tree frogs are infertile.

This hormone molecule, which does not decompose easily in the environment, is deposited in the sludge at the bottom of the pond lake and swallowed into the belly by the larvae of the amphibians that live on the bottom. This hormone works in very small accumulations and can easily be dispersed by the wind, making it a global threat wherever it is native. <>