Re: Is there any reason for the evolution to be one way
- From: "Perplexed in Peoria" <jimmenegay@xxxxxxxxxxxxx>
- Date: Tue, 27 Mar 2007 12:24:43 -0500 (EST)
"Shaktyai" <Fabrice.Allais@xxxxxxxxx> wrote in message news:eua8et$42g$1@xxxxxxxxxxxxxxxxxxxxxx
On Mar 26, 7:17 am, drosen0...@xxxxxxxxx wrote:
Concerning the number of species evolving from the ground to the
oceans. It is still ridiculously small compared to the one who did it
from the oceans to the continents. I do not know why and I am just
wondering if anyone has ever thought about it.
The reason is simple. Life started in the oceans. The continents
were empty. Early in the evolution of life, the only direction to go
was to the continents. The evolution of forms that could live on
continents was high because there was no competition. Mutations that
would have been immediately eaten in the ocean could live on land with
no threat of being eaten. A mutation that enabled the animal to breath
air was almost certain to be successful, because he could run away to
where no one could find him.
After the first land-lubbers evolved, there was competition in the
oceans and on the continents. The direction could go both ways, but
the backwards direction was blocked by competition. A mutation that
enabled the creature to live in the ocean would not ensure survival. A
mutation that enabled an animal to breath under water would not help
since if he gets back to the water, a fish would eat him. Evolution
going the other way slowed down because of competition.
That is probably the reason indeed. Do you know by any chance a good
paper working on the coupled dynamics of a gene pool and a predator-
prey system ?
The subject is far too large to be covered in a paper. See the book
by Josef Hofbauer and Karl Sigmund for an introduction.
.
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