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Megafauna Extinction Due to Climate
jvchamary writes "Most biologists believe that Earth is currently undergoing its sixth mass extinction. The cause? Human activity, either directly (e.g. the Dodo) or indirectly (e.g. the Amazon rainforests). The disappearance 30,000-45,000 years ago of the Australian megafauna, large animals such as the marsupial lion, is often attributed to hunting by Aboriginal settlers. However, recent research in Proceedings of the National Academy of Sciences suggests that it was more likely a shift in climate, rather than hunting, that caused the over-sized organisms to die-out (via Nature and the BBC)."
We Win!
That's too bad...I've always liked the idea of my ancestors storming across the land, exterminating entire species of giant animals with spears and rocks.
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~ |rip/\/\aster /\/\onkey
Interesting bit about the mega mammals. There's a diarama at the Chippewa Nature Center, Midland, Michigan, depicting a giant beaver. Stood about 6 feet tall, probably a few hundred pounds. (what kind of trees did this thing gnaw anyway, it'd need lots of them) Always wondered how they would have died off, I can't imagine too many bow-and-arrow or spear wielding humans able to take on something like that.
A feeling of having made the same mistake before: Deja Foobar
I envy early man and his wider variety of animals to eat
However, this is not an excuse for an "anything goes" attitude. We still need to work hard to preserve the earth; it is one of our greatest responsibilities.
Taken From "http://www.exploratorium.edu/sunspots/"
Personally, I've always found it rather arrogant to believe we are the greatest cause of climate change on Earth. Lol, it could be that the Sun is literally causing us to use more energy...but thats taking the butterfly effect a little too literally - maybe.
Hmm. I know a relatively famous (in his field, at least) paleoanthropologist,and was just talking to him about this very thing. I asked him his thoughts about the two competing theories of large animal extinction.
He said that while it was currently fashionable to blame the climate and exonerate aboriginal hunters, he said it makes perfect sense that it was probably a combination of the two.
We modern humans have a definite tendency to underestimate the intelligence, resourcefulness and persistence of our forebears. A good example of this is all the mysticism and voodoo crackpot theories of how Stonehenge, the pyramids, etc. were built. The fact is that ancient people were quite -- sometimes ingeniously -- resourceful at accomplishing what they wanted to do.
Along that same vein, I have no doubt that they became quite expert at killing such things as mammoths, which would feed a whole clan for months (esp. if you dry some of the meat, etc) and provide ivory, bone and fur besides. Mammoth hunting would also have been a great opportunity for clan members to show their skills, bravery and dedication to the tribe -- something of great importance in many aboriginal societies.
Paleoanthropologists are a pretty interesting bunch to talk to.
- Alaska Jack
Well, there are three possible ways to look at this:
1. We're the product of evolution. We're the greatest and most interesting species evolution ever produced. We owe nothing to anyone but ourselves for our success and if we want to wipe out a few other forms of life so be it. We rock! And of course in the grand scheme of things if we did wind up wiping ourselves out, nobody will be around to care.
2. We're the product of intelligent design. If the Christians are right, the whole world is here for us to fill, subdue and use for our benefit. If we need to knock out a few species, its no different than me knocking out a wall in my house to make room for a pool table. We're the pinnacle of creation, We ROCK! And after ragnarok, there will be a whole new creation anyway.
3. We're either created or evolved, but we're adaptable enough that if the need arises we'll find a way to create new species to replace the ones we eliminated. Heck maybe we'll make whole new worlds. In this case, I guess the Mormons would be right. In any case, we're the smartest and most adaptable. We ROCK! In any case, we can always clean up the mess later.
Who am I to suggest I have the right to wipe out whole species? I AM MAN!
Trying to use sarcasm in text-based forums does not work.
In 10 million years, perhaps all primary terrestrial life will be descendents of Homo Sapiens. Perhaps we are just in the process of a morphological gene renormalization.
We will have human-derivitive predators, human-derivative herbavores, human-derivitive sea mammals, etc..
Sound strange? It shouldn't. Every once in a while, a specific set of genes shows so much ability to dominate that it completely overwhelm all others and then slowly specializes in the ecosystem, taking on the familiar roles we see. The first Dinosaurs were all morphologically identical with differentiation only occuring as the other species in the ecosystem were driven to extinction and leaving room for the different ecological niches to be filled through evolved Dinosaur morphology. Same with Mammals.
I suppose this vision could require a collapse of civilization such that humans actually had to fill all the various niches in the ecosystem, but given 10 million years, I'd say that is pretty likely. It would be pretty gruesome in the beginning, with canabilism and whatnot being fairly common, but after a few hundred millenia it should shake out to a variety of different predators and prey subspecies quite readily.
The reason that it can be true that 1+1 > 2 is that very peculiar nonzero value of the + operator