According to the data, the average life span of salamanders in captivity is 5 to 6 years, but the life span of some salamanders is as long as 17 years? "KDSPs" wild salamander lives in the lake and canal of XoCimelCo on the southern edge of Mexico City. Ak salter once lived in another of the five lakes in Mexico City-Lake Garlake, where Aztecs settled in ancient Greece. But according to NBC News, all these lakes except Xochimilco were drained in 1970s to prevent flooding and allow urban expansion. The carnivorous food of Axis dragons historically put them at the top of the food chain. They can catch anything: mollusks, fish and arthropods such as insects and spiders. They even ate each other. However, according to an article in JSTOR Daily, in 1970s and 1980s, the Food and Agriculture Organization of the United Nations introduced tilapia and carp into salamander habitats to provide more protein for local residents. These fish wolfed down their young axons, which was an invasive threat to salamanders.
Axon mating dance Axon reproduction begins with dance-literally. According to the animal diversity website of the University of Michigan, these salamanders will waltz after a male and a female nudge and touch each other's urogenital opening (called cloaca). Then, the male wags his tail like a hula dancer to lure the female to follow him. When two couples come together, the male will drop a small white capsule filled with * * *, which is called a * * * ball. When the female is dragged behind, the male moves forward until the female bypasses the ball and picks it up with the cloaca.
Axon jellyfish go through a courtship process once a year, usually from March to June. With the courtship dance behind her, the female axon animal will attach 100-300 eggs coated with jelly to aquatic plants or rocks alone. After about 10 to 14 days, the eggs hatch and the young live independently. Axonal maturation takes about one year.
Unlike most amphibians, axons will never become land adults who breathe with their lungs. Stephen Jay Gould, an American evolutionary biologist, described salamanders as "sexually mature tadpoles" because they always retain the characteristics of childhood: a completely aquatic lifestyle, flippers and pleated gills. This evolutionary phenomenon of "staying young forever" is called pedophilia or rebirth. Scientists can force axonal bacteria in the laboratory to deform by injecting thyroid hormone, but the metamorphosis of salamanders rarely occurs in the wild. KDSP, KDSP and some salamanders left by KDSP in the wild live in the swamp area around Mexico City. (Source: Suttstanwill) Is the salamander on the verge of extinction? "The International Union for Conservation of Nature and Natural Resources believes that the axial-flow dragons are on the verge of extinction, and their numbers are decreasing. 1998 and 2008 surveys found that the population density has dropped from about 6,000 people per square kilometer to 0/00 people per square kilometer. 20 15 a recent survey found that there are about 35 people per square kilometer.
Pollution is especially harmful to this species. In Mexico City, waste regulations and the development of tourism mean that garbage, plastics, heavy metals and high concentrations of ammonia overflow from garbage treatment plants, blocking the canal where salamanders live. "KDSP" and "KDSP" are a large number of captive populations, which exist in research laboratories all over the world and have thousands of people. But these salamanders originated from 33 people transported to Paris from Hodge, mirko and Mexico, so their populations are highly inbreeding. They will not stop the regeneration of their body parts. Various organs, including eyes, can be transplanted between axons without being rejected by the recipient's immune system. In 1968, the researchers found that they could even transplant the head of one axon to another, and the axon functioned normally. The combination of these abilities makes axonal bacteria an attractive model organism for scientists.
In 20 18, researchers discovered another strange thing about axonal bacteria: their genomes are very large. Among about 32 billion pairs of DNA nucleotides, the axon genome dwarfs the human genome, which is about 10 times that of the human genome and is the largest animal genome sequenced so far. Researchers are exploring the regenerative ability of axonal bacteria through the genome, The Secret Behind.
Other resources:
Read more key facts about axonal bacteria from National Geographic magazine. Learn more about the regenerative ability of axonal bacteria in the video of Institute of Molecular Pathology. Learn what will happen if wild axonal bacteria disappear forever from this article by NOVA.