Doomsday Bunker Upgrade

In terms of ecosystem research, Chen Xin can't help much, after all, this is not his field of expertise.

But when it comes to biological cultivation, he is quite good at it.

After all, when breeding large cold-resistant wolfhounds, Chen Xin personally presided over the entire project, and participated in the entire breeding process, even including the training and actual use of individuals after they were bred. Chen Xin participated in it, which can be called rich experience.

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

In naturally formed ecosystems and food chains, large animals usually reside at the top of the food chain, which is the last link in the closed loop of the entire ecosystem.

That is to say, the ecological niche of wolves in the cycle of rabbits eating grass, wolves eating rabbits, wolves dying in rotten fields, and grass growing again.

This ecological niche is necessary in the natural cycle, because if rabbits have no natural enemies, they will reproduce without restriction, and eventually break through the limit that the environment can bear, leading to the collapse of the entire ecosystem.

The Kangaroo Nation knew this well, and it still haunted them even before the disaster.

Back then, the kangaroo country unscrupulously massacred local native thylacines and other creatures at the top of the food chain. As a result, local rabbits, kangaroos and other creatures lost their natural enemies. The industry has dealt a heavy blow, and kangaroos are overrun.

At that time, the kangaroo country also tried to make some efforts, such as banning the hunting of thylacines, offering bounties to rabbits and kangaroos, but in the end, the results were minimal, and the country even needed to introduce wolves from abroad to curb the breeding of rabbits.

The reason is that they killed all the creatures at the top of the ecological niche, causing the entire biological chain to lose its balance.

But if it was placed in a small ecological environment like a dome city, the existence of such large predators would not be necessary.

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

This is why there is an old saying that one mountain cannot accommodate two tigers. Large-scale predators in the wild will have their own territory, and the purpose of driving out other large predators on the territory is to ensure that they can obtain enough food.

However, a small ecological environment like a dome city can carry some small herbivorous or omnivorous animals. Large predators like wolves and tigers are really unnecessary, and they may also threaten the safety of residents in the city. .

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

Anyone who has a little understanding of the ecosystem will know that in the ecological niche, the higher the number of organisms at the top of the food chain, the rarer the number and the more difficult it is to reproduce.

Top predators such as tigers and lions and other large predators can breed three to four cubs in one litter, which is already a very high yield. Usually there are only one or two, and they only breed once a year. The population is very large. Difficult to expand.

As for small and medium-sized predators such as cats and dogs, their reproductive ability is relatively stronger, and it is common to have three or four babies in one litter.

If it is a smaller animal, their number of reproduction will be even greater. A litter of more than a dozen such as mice is not enough for small creatures.

The smaller the body size, the more it can only rely on quantity 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-sustainability, operation and balance of the ecological system, it needs more tiny creatures that we can't see at ordinary times, such as earthworms, rather than cats, cats and dogs. They are all big guys.

"Then what if you want to raise cats and dogs?" During lunch time, listening to Chen Xin talking about these issues, Mo Qingyan asked Chen Xin with great concern.

In fact, she has always wanted to raise a cat, a cuter kitten, which is completely different from Qin Lan who wanted to raise a dog and train it to be a police dog.

"It depends on how you want to raise it. If you just keep it as a pet at home, then it's not a big problem. Just make sure that the cat and dog have enough food, do a good job of neutering, and don't let the cat and dog run around. Pets are similar, and won't cause too much burden on the ecology." Chen Xin has really considered this issue seriously, as cats and dogs are one of the animals closest to human beings, there must be many people who want to keep cats and dogs.

When a disaster strikes, it is not easy to guarantee people's survival. Pets such as cats and dogs are not considered at all. Therefore, in addition to private shelters that may keep some pets or animals, official shelters are No one brings pets in.

Now that the situation is gradually improving and the supplies are guaranteed, there will definitely be people like Mo Qingyan who want to keep pets to accompany them.

In Chen Xin's view, this is not a big deal. Although some people will say that people can't eat enough to feed their pets, but in Chen Xin's view, as long as people who want to keep pets are willing to pay more The labor, the remuneration obtained can afford the consumption of raising a pet, this is not something that cannot be done.

But after hearing his answer, Mo Qingyan had some more thoughts, so she asked him: "Then what happens if the pet runs out and becomes a stray cat or dog?"

"If this is the case, we can only hunt and kill them." Chen Xin's words showed a hint of cruelty, but he still explained patiently: "Stray cats and dogs are very serious in destroying the ecology. Dogs are a little bit better. Strong desire to hunt.

But for cats, they are animals full of hunting impulses in their bones, and they are also rare animals in the animal kingdom that hunt for fun. Even if a cat is sterilized and will not reproduce, its existence will It poses 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 hunted. After all, the ecology of the dome city is much more fragile than the natural ecology in the original urban environment. Once it is destroyed, it may bring The collapse of the entire ecological environment. "

"Well, I can understand that stray cats and dogs are a very harmful problem." Regarding Chen Xin's attitude on this issue, Mo Qingyan showed an understanding attitude, but her emotion was obviously still the same. Looks a little depressed.

Stray cats and dogs do have great damage and impact on the ecological environment, especially stray cats. Without sterilization, a litter of cats can easily destroy the ecology of an area.

So try not to feed stray cats as much as possible, but provide assistance to them, or adopt them, and don’t raise cats yourself on impulse, just drive them out if you don’t want them.