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The isolated lakes mentioned in this question that are not connected to other water systems exist in nature, namely Lake Maar, which is located in a special type of extinct volcanic crater. 1) Lake Maar is a closed lake with no rivers flowing in or out. The water level balance is mainly controlled by precipitation and evaporation factors. Relatively speaking, the hydrology and sedimentary system of Lake Maar are relatively simple, and it is easy to interpret paleo-climate and paleo-environmental changes; 2) The steam jet eruption is generally located hundreds of meters underground, and the formed Maar Lake has a large depth and thick sediments, which can provide continuous and stable deposition records for tens of thousands or even millions of years; 3) The “deep water, anaerobic” of Maar Lake “The environment makes sediments less disturbed by waves and benthic organisms, which is conducive to the formation and preservation of annual laminae. The existence of annual laminae can increase the resolution of paleoclimate and paleoenvironmental changes to seasonal-annual Scale; 4) In terms of alternative indicators of paleoclimate change, there is a wealth of diversity, such as diatoms, golden algae, algae, chironomid, ostracods reflecting aquatic habitats, pollen and phytoliths indicating terrestrial vegetation, and Various physical and chemical indicators enable us to understand paleo-climate and paleo-environmental changes from different perspectives, and test the reliability of reconstructed data. Therefore, Maar Lake is an ideal place for the formation and preservation of high-resolution sedimentary records, providing rare materials for the development of multidisciplinary paleoclimate and paleoenvironmental changes. Chu Guoqiang, Liu Jiaqi. 2018. Maar Lake in China and its research significance. Acta Petrologica Sinica, A Maar Lake in Longgang. There are various algae and aquatic arthropods in Maar Lake, but whether it can support fish is not certain, there are indeed some There are no fish in Maar Lake. There is also a man-made environment similar to Lake Maar-the upper reservoir of the pumped storage power station, which is a lake that needs to be built on a mountain. Generally, there is no connection with the natural water system. The only exchange is with the lower reservoir-by pumping water from the lower reservoir to the upper reservoir to store energy, and drain from the upper reservoir to the lower reservoir to generate electricity. I have heard from hydropower experts that there will be filtration when pumping water, and theoretically no fish will be sent from the lower storage. But in fact, fish can appear in the library.


By zhiwo

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7 months ago

From low altitude to the middle of the ionosphere, there are many kinds of single-celled organisms floating in the global atmosphere. There are fungal spores, green algae, and small spiders flying in the wind by hanging strings, which are always airborne on every surface. It is impossible to find a “depression” on the earth’s surface that “has no living things” but can contain “a lake”. Even if you “completely disinfect” the depression first and then pour water, the microorganisms in the air will still fall into the open “lake water”. Before you finish pouring, a bunch of photosynthetic organisms are already running in your water.

7 months ago

In the past, the roads in villages and towns had not hardened, and many of them were dirt roads or paved with stones. If a heavier car has been driven, it will leave a deeper rut. In the spring and summer, if it rains again, a few days later, a group of translucent fish will be found in this puddle. You see, you don’t need a lake of water, you don’t need ten years, just a rain in summer, a miracle of life can be born. In the biosphere, in any non-isolated and non-enclosed environment, various kinds of life will appear for various reasons. There are often seeds, eggs, or spores of various organisms in the soil, and life may be bred on tiny dust and droplets that are invisible to the naked eye in the air. This world is not barren, at least, on the earth, where human beings walk, we can all find life.

7 months ago

If you are lucky, it will be there. Let alone the algae and ferns. Even the eggs of many aquatic organisms can be stored away from water, or even drift away in the wind, especially microorganisms, small snails, and small fish. The so-called magic/space fish eggs sold on Taobao in the past are actually ordinary medaka eggs. I just searched it, and now I’m honest, it’s a medaka, not a magic fish or a space fish. But the soil mixed with fish eggs is still called magic soil. It is said that fish grow in the soil. In addition, it also comes with brine shrimp eggs used as fish food. They are all dry. Throw a little into the water and hatch within a few days. Brine shrimp. In fact, fish farmers know that brine shrimp eggs can be dried and stored for a long time. Therefore, for a slightly larger water hole, as long as the time is longer, there will be microorganisms and fish, and then a food chain cycle will be formed. The premise is that the water body must be large enough that the water quality cannot be damaged before the fish hatch.

7 months ago

Of course there will be. First of all, let alone single-celled organisms and algae, they are everywhere. Let’s talk about multicellular organisms. Many ancients believed that fish and shrimp were changed from soil because they discovered a phenomenon. A new pit appeared, raining water turned into a lake, and some small fishes would appear soon. This makes them puzzled, they can only think that the fish and shrimp are muddy. In fact, they did not find the true source of these fish and shrimps. First, it is the forces of nature, such as wind and rain. The wind and rain rolled up fish eggs and even adults in nearby water bodies and dropped them into new water bodies. So there are fish and shrimps in the new water body. This is why there are many records of a big fish from heaven in history. The second is the existence of underground rivers. There are underground rivers in many places, and these pits are originally places where the soil and rock layers are relatively thin. Once there is water in the pit, the pressure increases, the rock mass is cracked, and the water in the pit is connected to the underground river. Creatures in the underground river can come to the lake through the gap. Finally, it was brought by wild animals such as birds. Some birds migrate between different bodies of water. In this process, the fish eggs will be attached to the body and carried to another body of water. The eggs hatch, and there are fish in the new body of water. Not only water birds, but other wild animals may also bring fish and shrimps inadvertently. In the end, it is human beings, brought consciously and unconsciously. The most common cause is ballast water, which brings aquatic life from one place to another body of water.

7 months ago

Hmm…In a sense you created a poor experimental environment. The depressions are equivalent to petri dishes, and the lake water is the culture medium. Culture medium refers to a nutrient substrate prepared by a combination of different nutrients for the growth and reproduction of microorganisms, plants or animals (or tissues). Petri dish… is a container for culture medium. The emergence of organisms is an inevitable result. Given that your experimental environment is too crude, the types and numbers of organisms born are almost unimaginable… Don’t ask me how I know. In addition, don’t choose a clean laboratory for work-study programs…

7 months ago

There will be, and as long as the time is long enough, the species will be abundant. In the beginning, only mosquitoes and dragonflies waited for insects to lay eggs, and when insects came, birds came slowly. There are many places where birds go, especially water birds. Their claws and feathers will carry the seeds of various algae and aquatic plants, and even fish eggs. Over time, there will be schools of fish. Over time, species will become more and more abundant. You can watch a documentary “The Hidden Paradise”, which tells the story of an abandoned quarry on the Rhine River that turned into a paradise for aquatic animals. There are even jellyfish in it, you can’t think of it. That place is far from the sea…

7 months ago

First of all, it is impossible to find “depressions” “without any living things” on the earth. Any piece of land on the earth, from the Zambezi River to Mississippi, from Siberia to the Amazon rainforest, from the Tibetan Plateau to the Sahara Desert, has traces of life. Of course, life here does not specifically refer to those common plants and animals that are visible to the naked eye, such as cows, sheep, horses, and even carp, crucian, and grass carp. It includes nematodes, insects, earthworms and other small creatures in the soil, including the hyphae and tiny plant seeds of various fungi in the soil, including bryophytes, algae (Note 1), and soil on the surface of the soil. Microorganisms such as more tiny bacteria and actinomycetes. Even in the Qinghai-Tibet Plateau (including the permafrost of the Qinghai-Tibet Plateau), the Sahara Desert and other places where the natural environmental conditions are relatively harsh, there will be a variety of microorganisms on the surface, and there will be cold-resistant bacteria and heat-resistant bacteria that adapt to extreme environments. Microbes survive. Therefore, as long as there is a “depression” on the earth, there will be living things. Next, we will discuss the situation of thoroughly disinfecting and sterilizing the puddle made of man-made materials such as cement. has already introduced the existence of living things in the air in the answer. In this case, as mentioned in the answer of Ling Jie, the microorganisms in the air will fall into the water and grow. Therefore, this will inevitably prevent the entry of organisms in the water. In summary, as long as this puddle is on the earth, it will definitely be mixed with living things. Next, we will discuss the situation where this “depression” is not on the earth. There are eight planets in the solar system, namely Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Among them, Jupiter, Saturn, Uranus, and Neptune are gaseous planets and will not have a solid hard surface, so there will be no “depressions”. Then we only consider Mars, Venus and Mercury. If a lake of water is poured on Mars, because the surface temperature of Mars is very low and the air pressure is also very low, the water will freeze and gradually sublimate. There is water on the surface of Mars, as well as carbon, an element necessary for life, but whether there are microorganisms on Mars has not yet been determined. Whether there are microorganisms on Mars remains to be studied. As for Venus, it is generally believed that there are no living things on Venus, and it is not suitable for living things. The surface temperature of Venus is as high as 400 degrees Celsius, the pressure is very high, and the atmosphere is also full of carbon dioxide and sulfuric acid. If you put a lake of water on Venus, it is estimated that it will evaporate in two days and be filled with sulfuric acid rain. No creatures will appear in this way. The conditions of Mercury are more severe, with higher daytime temperatures and great temperature differences between day and night. The daytime temperature is as high as 400 degrees Celsius, and the night temperature is as low as minus 100 degrees Celsius. Put a lake of water on Mercury, and it will either evaporate or freeze into ice and sublimate, and no living things will appear. The conditions of the planets in the solar system have been discussed above, and there are satellites in the solar system, so I won’t discuss them one by one. In fact, our discussion cannot exhaust all celestial bodies. In view of this, this answer will stop here for now. Note 1: Modern taxonomy generally does not regard algae as plants, but classifies them as protists. The more classical classification is used here, and algae are still classified as plants.

Last edited 7 months ago by greatword
7 months ago

There will be algae, larvae, bacteria, and various prokaryotes, which will be produced in large quantities within half a month. If the water body is big enough and the time is long enough, there will even be fish. It may be a little confusing, but even if people don’t care about it, there will be tornadoes sucking fish from other places and falling here. Waterfowl from other places catch fish and fly here and fall off. There are rice loach from other places. Holes came and so on and so on.

7 months ago

The answer may surprise you. If you dig a pond in a field and fill it with water, within a year, in addition to algae, aquatic plants, microorganisms, and small insects, the most surprising thing is that it may grow. Small fishes and shrimps live in it, which of course was not deliberately put in. However, in this situation, with the current large-scale use of pesticides and fertilizers, the number of small creatures such as insects and frogs in the wild has been reduced a lot, and it is almost impossible to see them.

7 months ago

Not counting the various microorganisms or seeds in the soil and lake water itself, not counting the microorganisms suspended in the air, not counting the amphibious frogs, not counting the spores and plant seeds that can float around in the wind, the bird activity itself is Will bring all kinds of fish eggs and seeds. An important reason why small fish and shrimps appear in artificial water holes is that fish eggs and shrimp eggs will stick to the feathers and feet of birds. For example, birds such as wild geese, wild ducks, egrets, etc. flew over from a nearby stream and lake, and the feathers and feet of the birds may have live fish eggs and shrimp eggs sticking to them. It is also possible that terrestrial animals drank water in a nearby lake, got fish eggs on their feet, and then ran into this new lake. In addition, most birds have relatively short digestive tracts, and the feces can be excreted from the cloaca at any time, and the feces of birds may bring fish eggs. High winds may also bring fish eggs. There are too many sources of plants. For example, birds and terrestrial organisms may have seeds or spores on their feet and feet, and the feces of birds and terrestrial organisms can also bring in various seeds and microorganisms.

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