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PostPosted: Sat Aug 28, 2010 8:14 pm
 


ShepherdsDog ShepherdsDog:
OK...Garter snakes and Grass snakes don't live in swamps yet they give live birth. Pythons and Boas inhabit similar climates and terrain, yet the former lays eggs and the latter doesn't. You better bail out as you're still burning up.


Animals evolve different rates as well and there would be more to it than just climate and terrain. You also missed the main point of the news topic as well, we are watching a species change from eggs to live birth for the first time.


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PostPosted: Sat Aug 28, 2010 8:17 pm
 


It should be determined if this is a natural progression or if there has been some other environmental influence, such as pesticides.


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PostPosted: Sat Aug 28, 2010 8:19 pm
 


ShepherdsDog ShepherdsDog:
It should be determined if this is a natural progression or if there has been some other environmental influence, such as pesticides.

Who grows crops in mountains?


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PostPosted: Sat Aug 28, 2010 8:23 pm
 


ever been to that part of Australia? It could also be some other toxin.


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PostPosted: Sat Aug 28, 2010 9:43 pm
 


ShepherdsDog ShepherdsDog:
It should be determined if this is a natural progression or if there has been some other environmental influence, such as pesticides.

Or changes to temperature...
$1:
Some skinks, they argue, simply retain the egg in the uterus for a longer period of time to protect it from colder external temperatures. The longer the egg is kept in the uterus, the thinner the shell becomes. When a skink is born live, all that remains of the shell is a thin membrane, which the mother helps the baby break open.

The cold explanation cites a 1996 study and explains why the mountainous skinks are making the leap to live-birth faster than their lowland counterparts.

The young may be born "live" but there is still a membrane remaining, just not a hard shell, like with an actual egg. I see it more as an adaptation to the external environment the lizard lives in. I am uncertain as to the changes this region may have experienced temperature-wise over the years. Perhaps this would offer an explanation.


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PostPosted: Sat Aug 28, 2010 9:59 pm
 


jeff744 jeff744:
ShepherdsDog ShepherdsDog:
It's not a major step forward is what I'm saying. There a few ovoviviparous reptiles, so it's not anything big, like finding one that has an endothermic metabolism. Also fish which are lower on the evolutionary scale than reptiles give live birth, like the sharks I mentioned, and the shark is one of the most primitive of fish. We still have egg laying mammals.

So if monkeys suddenly start to speak English fluently that is not a major step?


Ya, I'd decide to start speaking French tomorrow.


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PostPosted: Sat Aug 28, 2010 10:42 pm
 


Strutz Strutz:
ShepherdsDog ShepherdsDog:
It should be determined if this is a natural progression or if there has been some other environmental influence, such as pesticides.

Or changes to temperature...
$1:
Some skinks, they argue, simply retain the egg in the uterus for a longer period of time to protect it from colder external temperatures. The longer the egg is kept in the uterus, the thinner the shell becomes. When a skink is born live, all that remains of the shell is a thin membrane, which the mother helps the baby break open.

The cold explanation cites a 1996 study and explains why the mountainous skinks are making the leap to live-birth faster than their lowland counterparts.

The young may be born "live" but there is still a membrane remaining, just not a hard shell, like with an actual egg. I see it more as an adaptation to the external environment the lizard lives in. I am uncertain as to the changes this region may have experienced temperature-wise over the years. Perhaps this would offer an explanation.


That is exactly what evolution is - a response to a change in environment. Otherwise there's not point in evolving, if you're already adapted to what's there. The environment can be anything, including other species.


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PostPosted: Sun Aug 29, 2010 5:44 am
 


It may not be an evolutionary leap after all.
Maybe they already had that trait/capability and it's just kicking in because of changes in their environnement.
Remove whatever made it kick in, and they might go back to laying eggs.


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PostPosted: Sun Aug 29, 2010 6:14 am
 


I for one bow to our new reptilian overlords.


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PostPosted: Sun Aug 29, 2010 6:25 am
 


I wonder when they'll do a study of this type on humans.... :?

I know damn well that some people on this forum were hatched from an egg....Hmmmmm....could be a change in environment making us revert back... PDT_Armataz_01_08 ...but it probably has more to due with the advent of and the evolution of politics... :twisted:

From what I gather from the article, the low land population is also going to live berthing, just at a slower rate than their mountain cousins. Seems to me that all are evolving but due to their environmental conditions, the mountain population is evolving and adapting simultaneously. The mountain population is taking advantage of the new evolutionary trait far quicker is all. They also commented that once a species changes from egg laying to live berth, they don't go back.


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PostPosted: Sun Aug 29, 2010 7:13 am
 


jeff744 jeff744:
ShepherdsDog ShepherdsDog:
It should be determined if this is a natural progression or if there has been some other environmental influence, such as pesticides.


Who grows crops in mountains?


Look up terrace farming...

It's common in lots of places - Japan, China, Peru, etc.


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