N
nerfherder
Guest
Come to Africa and talk to one of the Game Rangers in Kruger National Park in South Africa. I know that 50 years is a short time; I know that this should not have happened. It is not a matter of elephants wishing to evolve in a certain way - we can be sure of that. And sure elephants live for ages - often much longer than fifty years.Being new here, I think the last thing I wanted to do was to drop into a discussion and “snipe” someone else’s post but since no one has apparently picked up on this, I figured I’d bite.
In order to make the claim above, one would have to believe:
I don’t mean to cause a ruckus but I can’t for the life of me understand how this could make sense to anyone.
- that African Elephants, as a species, have come to the realization that they are being poached for their tusks
- that these elephants have consequently decided to grow shorter tusks in order to dissuade the poachers
- that these elephants have been able to bring about these changes somehow
- that all of this has occurred over only 50 years, knowing that the lifespan of an african elephant is about 50-60 years
The important thing is the length of a generation, which is about 10 years. That means over the past 50 years, we have had five generations of elephants in which to effect a change in response to the depletion to the point of extinction of Africa’s elephant herds.
My understanding is that most of the largest tuskers were poached out very early on, by random hunters in the early part of the 19th century, by sport hunters mid-century, by soldiers (Mau Mau in Kenya and Frelimo in Mozambique for example) and by people needing meat to eat and ivory to sell from the 1960s on.
The genes of the big tuskers more or less died out, or at least became dangerously close to extinction, except in isolated herds. (The Kruger National Park Museum at Letaba North has the skulls of five famous tuskers of enormous size.)
If the genes died out, if the great tuskers were no longer there to fertilise the harem, then male elephants with shorter tusks would do the job. And so on through the generations during the past century - to the point that we now have very few great tusks left anywhere in the Southern Africa region. What there is is hardly worth poaching.
I consider, on the basis of observation over forty years, and what I have read, that I have seen evolution happening among elephants.
You can also consider the case of mixomatosis in Australian rabbits: the alien microbe was introduced into rabbits with a view to clearing out the rabbit population which ate grain intended for sheep. The microbe first killed 99% of rabbits; but it and the rabbits reached an amicable balance within 6 generations (3 years, given that a rabbit generation is 6 months). It is hypothesised (Plagues and Peoples) that statis between a microbe and a human being or another mammalian is reached in six generations. And that is an excellent exemplar of evolution - for me at least.
I am hoping that this is what will happen in the case of the HIV prion: governments are sure not getting their acts together with regard to prevention or cure, and I know that because that is my profession. It looks as if we will have to wait out the 6 generations (150 years) before we reach an amicable relationship with the HIV microbe - unless we all die first.