Sujet : Resurrecting the mammoth
De : rokimoto (at) *nospam* cox.net (RonO)
Groupes : talk.originsDate : 10. Mar 2024, 18:45:27
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <uskrjm$32s9g$1@dont-email.me>
User-Agent : Mozilla Thunderbird
https://www.cnn.com/2024/03/09/world/woolly-mammoth-elephant-stem-cells-scn/index.htmlAnother article about bringing back extinct species. The claim is that they can help restore the arctic habitat, but that is nuts. One of the reasons that the megafauna species went extinct was due to the fact that their habitat was greatly reduced in a cycle where the habitat that they liked was around for a hundred thousand years, but they had to survive 20,000 to 30,000 year periods when their habitat was greatly reduced. My guess is that the long cycles did in the megafauna because they needed a lot of territory to produce viable populations, and after adapting to 100,000 years of expanded habitat they were restricted to pockets of alpine and arctic habitat that likely could not sustain viable population numbers for the largest herbivores. The last warm interval it got warmer than it is now, and more ice melted. There was less arctic habitat for mammoths and wolly rhinos. The DNA we have recovered indicates that they had severe population crashes. The last paper that I saw indicated that the rhino population genetics did not recover and still looked like a population bottleneck even though indications were that the population size had recovered very quickly once things cooled down again, but the genetic variation didn't seem to recover, and then they went extinct when things started to warm up again. The Wrangle Island Mammoth were not hunted to extinction. Inbreeding depression seemed to have killed them off.
Whatever they brought back today would just ruin the existing habitat for the species that have made it so far. They need to think about bringing them back when New York is covered by a mile of ice again.
Ron Okimoto