The average reproductive life of mammals is 1 to 2 million years!

 According to foreign media reports, the huge blue whales have survived in the ocean for about 4.5 million years, but Neanderthals have gone extinct in hundreds of thousands of years. Are these creatures representative of all species? How long can a species usually survive before extinction?


　　 Facts have proved that the answers we have found may be different from expectations. Due to the destruction of biological habitats, climate change and a series of other factors, plants and animals are disappearing from the earth faster than at any other time in history. Some experts claim that humans are currently in the sixth mass extinction event stage, but even during a relatively quiet period in the earth’s history, the answer will vary depending on the type of species you observe. According to an article published in the journal "Human and Earth", the average reproductive life of mammals is 1 to 2 million years.


　　 However, this average does not apply to all geological periods and all mammals. According to a study published in the journal "Comprehensive Zoology" in 2013, the average reproductive lifespan of mammals in the new generation (65 million years ago) was 3.21 million years, and large mammals lived longer than small mammals. . For invertebrates, their continued survival time is even more impressive, with an average reproductive life span between 5 million and 10 million years.


　　 However, these digital records(replica hermes) are somewhat controversial. Experts have not reached a consensus on the average reproduction time of any type of species before extinction. Fossil records the time when a species appears and disappears, but it has a big error, because the conditions for fossil formation must be perfect, and when a species appears and disappears, these conditions do not always exist. And these longevity statistics are not always valid. Stuart Pimm, chief extinction expert and eco-environmental conservationist at Duke University’s Nicholas School of the Environment, said that he prefers to consider the characteristics of species extinction from the perspective of how many species are extinct every day, month or year.


　　 Pim said: "The mortality rate is easy to calculate and statistics, mainly because some species have a longer reproductive life span, while others have a shorter reproductive life span. Therefore, the macro-average data for a biological species is not as accurate as people think."


　　 Species mortality, also known as background extinction rate, is controversial. Pim believes that the historical extinction data-including all periods (but not large-scale extinctions), the annual extinction rate is about one in 1 million. This means that if there are 1 million species on Earth, one species will become extinct every year. In contrast, according to a study in the journal "Public Science Library Biology", there are currently about 8.7 million species of living things on the earth. However, according to a research report published in the journal "Science Advances", other experts estimate that species usually become extinct at a rate of one in ten million per year, and some species are extinct at a rate of two out of 1 million per year. .


　　 Pim pointed out that the current rate of species extinction is higher than any historical rate. It is even more than 1,000 times the background extinction rate he proposed. However, Tierra Curry, a senior scientist at the Oregon Biodiversity Center in the United States, said that not everyone agrees with how the current extinction is accelerating. Some experts estimate that the current species extinction rate is only 100 times faster than the background extinction rate, and in extreme cases, the species extinction rate will be 10,000 times faster than the background extinction rate.


Currie said: "There are currently several factors that can explain why scientists have different estimates of the current rate of species extinction. The extinction rate is based on how many species there are on the planet and the rate at which they are extinct. In fact, no one knows these two issues. Accurate answer. About 90% of the existing species (2021 hermes bags) may not be identified by name. If researchers don’t know that a species ever existed, then they won’t know that it has become extinct. Another complicated question is, It is difficult to judge the exact extinction time of a species. For example, researchers have not seen a certain organism for many years, but this does not mean that they will disappear forever. When the species is extinct in the wild, there are still some survivors in the zoo, so the statistics are accurate The time of species extinction becomes difficult.


　　 Currently, the consensus among experts is that the extinction rate of contemporary species is too high. Pim said: "Species are adapting to their living environment as quickly as possible, but eventually they will run out of luck. They don't adapt fast enough and they will eventually go to extinction."

Comments

Post a Comment

Popular posts from this blog

You Can Buy the New Hermes Evelyne Sellier Bag Online

 By now, you’re very likely informed about the Hermès Evelyne Bag , Even though you can’t see on your own getting into the Hermès tax bracket. It may not be as widely renowned as the Birkin or Kelly, however the Evelyne is actually a typical of a distinct kind: it’s fewer formal compared to brand name’s extra popular bags, that makes it a fantastic relaxed option for occasions wherein the Birkin established may, say, operate some errands or visit brunch. Compared with a lot of Hermès luggage, what would make the Evenlyne distinct isn’t its signature components, but relatively a perforated H over the entrance of your bag. Together with the 2021 Hermès Evelyne Sellier Bag, the brand modifications up that extremely ingredient, amongst other things. The Hermès Evelyne Sellier very first debuted in Slide 2016, but it’s hardly ever prior to been available to purchase on the net, which suggests we’re only now getting a near look at the bag and its specifications. The obvious change is th...
Read more
 While Hermès is known for its challenging-to-obtain handbags, that’s not the entire story on how the brand name interacts with its customers. Indeed, Birkins and Kellys might be tricky to supply (but it surely’s not unachievable), as well as most exotics. In recent years, while, Hermès has designed an at any time-growing variety of its baggage available to order on its Site, whether or not the website itself wasn’t conducive to searching. Now, though, Hermes.com has pulled itself to the 2010s, and the new web-site incorporates various hundred in the brand name’s sought-right after bags. You continue to gained’t come across any 2021 hermes Birkins or Kellys up for grabs in the manufacturer’s on the internet keep, but you can find loads of Bolides, Lindys, Jypsieres, Back garden Get-togethers, Evelynes and over and above, including the occasional unique, similar to a nilo crocodile Lindy that retails for $30100. The overall collection is sort of fantastic, with most baggage offered...
Read more

Space oddity? Monolith in Utah desert mystifies helicopter crew

  By Peter Szekely (Reuters) - They were on a mission to count sheep when they found something they had not counted on. As a Utah helicopter crew buzzed over the southeastern part of the state looking for bighorn sheep last week, sitting beneath them in the middle of the desert was a bright shiny monolith, the stuff of sci-fi sagas. Pilot Bret Hutchings of the state Department of Public Safety recalled someone on board spotting the gleaming metal object firmly implanted in a small clearing set against the redness of the rocks and sand below. “He’s like, whoa, whoa, whoa, turn around, turn around,” Hutchings told KSL-TV in Salt Lake City. “There’s this thing, there’s this thing back there. We’ve got to go look at it.” After Hutchings set their helicopter down in the remote area, which remains undisclosed to discourage a rush of gawkers, they got a closer look, but found "no obvious indication" of how it got there, the public safety department said. Images released by the depar...
Read more