Chapter 623

Chen Xin can't help much in ecosystem research. After all, this is not his field.

However, he is good at biological cultivation.

After all, Chen Xin personally presided over the whole project when cultivating large cold resistant wolfhounds, and participated in the whole process of cultivation, even including the training and practical use after individual cultivation. Chen Xin participated in it, which can be called rich experience.

It's just that the animals needed to build the ecosystem are not large animals, or the demand for large animals is not so great.

In the natural ecosystem and food chain, large animals usually live at the top of the food chain, which is the last link of the closed loop of the whole ecosystem.

That is to say, in the cycle that rabbits eat grass, wolves eat rabbits, wolves die in the rotten land, and then grow grass, the niche of wolves.

This niche is necessary in the natural cycle, because if rabbits have no natural enemies, they will breed unrestricted and eventually break through the limit that the environment can bear, leading to the collapse of the entire ecosystem.

Kangaroo state has been deeply aware of this, even before the disaster, they are still deeply troubled by it.

At that time, kangaroo country wantonly slaughtered the top of the local food chain, such as the original kangaroo. As a result, the local rabbits, kangaroos and other creatures lost their natural enemies, and began to breed in large numbers, destroying the grassland, causing a sharp deterioration of the local ecology, a heavy blow to the country's animal husbandry, and the kangaroos were rampant.

At that time, kangaroo country also tried to make some efforts, such as banning the hunting of kangaroos, offering rewards to rabbits and kangaroos, but the final effect was very little, and even needed the country to introduce wolves from abroad to curb the breeding of rabbits.

The reason is that they killed all the organisms at the top of the niche, leading to the loss of balance of the whole biological chain.

But if you put it in a small ecological environment like a dome City, the existence of this large predator is not necessary.

It is also easy to understand that such a small ecological environment has limited carrying capacity and can not sustain the survival needs of large predators.

This is the reason why the old saying says that there are no two tigers in one mountain. Large predators in the wild will have their own territory, and the purpose of expelling other large predators in the territory is to ensure that they can get enough food.

However, the small ecological environment such as Dome City can carry some herbivorous or omnivorous small animals. Large predators such as wolves and tigers are not necessary, and may threaten the safety of urban residents.

As for smaller predators such as cats and dogs, they are not suitable for dome cities, but the reason is that they are not suitable for breeding.

People who have a little knowledge of the ecosystem will know that in the niche, the more organisms at the top of the food chain, the fewer they are and the more difficult it is to reproduce.

Top predators, such as tigers and lions, can breed three to four cubs at a time, which is a very High-yielding Population. Usually there are only one or two cubs, and they breed once a year, so it is difficult to expand the population.

As for small and medium-sized predators such as cats and dogs, their relative reproductive capacity is stronger. It's common to have three or four births.

If they are smaller animals, they will have more reproduction. Mice, which have more than a dozen babies at a time, are not enough for small creatures.

The smaller the body size is, the more we can only rely on the number to ensure the continuation of the population.

This is not the restriction of the world rules in the novel, but the necessity of biological evolution and ecological evolution.

And the most important thing is that if the dome city wants to maintain the self-sustaining, operation and balance of the ecosystem, it needs more small creatures, such as earthworms, than cats and dogs, which can be regarded as big ones.

"What if you want to have cats and dogs?" At lunch time, listening to Chen Xin talking about these problems, Mo Qingyan asks Chen Xin with great concern.

In fact, she has always wanted to have a cat and a cute kitten, which is quite different from Qin LAN, who wants to have a dog and then train to be a police dog.

"It depends on how you want to keep it. If you just keep it as a pet at home, it's not a big problem. As long as you ensure that the cats and dogs have enough food, sterilize well, and don't let the cats and dogs run around, it's just like keeping pets in the past. It won't cause too much burden to the ecology." Chen Xin has really considered this issue seriously. As one of the animals most closely related to human beings, cats and dogs must still have many people who want to raise cats and dogs.

When disaster comes, it is not easy to protect people's survival. Pets such as cats and dogs are not considered at all. Therefore, in addition to the possibility of keeping some pets or animals in private shelters, no one brings pets into official shelters.

Now that the situation is getting better and the material supply is guaranteed, there will certainly be people like Mo Qingyan who want to keep pets with her.

In Chen Xin's opinion, this is not a big deal. Of course, some people will say that no one has enough to eat and there is nothing to feed their pets. But in Chen Xin's opinion, as long as people who want to keep pets are willing to pay more labor and the remuneration they get can afford the consumption of keeping a pet, this is not something that can't be done.

However, after listening to his reply, Mo Qingyan had some more ideas, so she asked him, "what if the pets run out and become stray cats and dogs?"

"If that's the case, we can only hunt and kill." Chen Xin's words showed a trace of cruelty, but he patiently explained: "stray cats and dogs do serious damage to the ecology. Dogs are a little better, and they don't have a strong desire to hunt.

But cats, in their bones, are animals full of hunting impulse. They are also rare animals in the animal kingdom that will hunt for fun. Even if a cat is sterilized and will not reproduce, its existence will pose a great threat to the local ecology.

So if there are stray animals like cats and dogs in the wild of the Dome City, they can only be killed. After all, the ecology of the dome city is much more fragile than the natural ecology of the original urban environment. Once destroyed, it may bring about the collapse of the entire ecological environment. "

"Well, I can understand that stray cats and dogs themselves are a very dangerous problem." As for Chen Xin's attitude on this issue, Mo Qingyan shows an understanding attitude, but her mood is obviously still a little low.

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