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Why did dinosaurs grow to such a large size ?


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#1    UM-Bot

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Posted 27 October 2013 - 01:12 PM

The key to explaining why some dinosaurs were so big may lie in the structure of their bones and joints.

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Scientists have long pondered over what made it possible for some dinosaurs to grow to immense sizes and why land-based mammals have never been able to do the same. Some sauropod dinosaurs weighed up to 30 tons, far heavier than the largest land mammals.

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#2    John Jensen

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Posted 27 October 2013 - 01:59 PM

How about dealing with the obvious. ALL giant flora and fauna including Dinosaurs and Hominids in the Geological record grew to a size that was biologically feasible for the attenuated gravity of that time. A 'lighter' or 'less dense' gravitational effect ('G' force) would allow all flora and fauna to increase in relative size compared to the 'G' force of today. As ALL larger flora and fauna died out across the mid Holocene, it is logical to assume that gravity increased in 'density' during that same period. The only problem with the above logical statement, means that IF true, then Einstein was the charlatan that Tesla said he was. And that folks, puts an end to theoretical Physics because Gravity is NOT a fixed Law as Newton postulated. It's all a bunch of smoke and mirrors, and when the reality can no longer be ignored, my oh my, what will we do?


#3    aimlesswalk

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Posted 27 October 2013 - 03:03 PM

View PostJohn Jensen, on 27 October 2013 - 01:59 PM, said:

How about dealing with the obvious. ALL giant flora and fauna including Dinosaurs and Hominids in the Geological record grew to a size that was biologically feasible for the attenuated gravity of that time. A 'lighter' or 'less dense' gravitational effect ('G' force) would allow all flora and fauna to increase in relative size compared to the 'G' force of today. As ALL larger flora and fauna died out across the mid Holocene, it is logical to assume that gravity increased in 'density' during that same period. The only problem with the above logical statement, means that IF true, then Einstein was the charlatan that Tesla said he was. And that folks, puts an end to theoretical Physics because Gravity is NOT a fixed Law as Newton postulated. It's all a bunch of smoke and mirrors, and when the reality can no longer be ignored, my oh my, what will we do?

That's a very interesting post and I've often wondered why organisms don't grow to the immense size now as they did in earlier ages I always thought it was something to do with higher oxygen levels but after some reading I've found that there doesn't seem to be a definite consensus about this matter. If humans existed back then could maybe they too have also grown to such sizes which reminds of me of the vague stories I've read about giant footprints being found which go against established theories.

Edited by aimlesswalk, 27 October 2013 - 03:11 PM.


#4    Hawkin

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Posted 27 October 2013 - 03:54 PM

Why do some species grow large and some small?  Maybe several factors come into play. Diet, genetics, enviroment, (etc) Why is an African elephant larger then an Indian elephant?


#5    Euphorbia

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Posted 27 October 2013 - 03:59 PM

I remember reading somewhere years ago that it at least partially had to do with the fact that oxygen levels where as high as 36% during the age of the dinosaurs compared with the 21% level we currently have....

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#6    Aten

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Posted 27 October 2013 - 06:27 PM

Yes, what Euphorbia said ! I read this also, I think it was on new scientist site, but can't be sure.

Edited by Aten, 27 October 2013 - 06:27 PM.


#7    ancient astronaut

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Posted 27 October 2013 - 08:34 PM

Because they ate all their vegetables?


#8    Finity

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Posted 27 October 2013 - 09:17 PM

There were higher levels of both Oxygen and CO2. That caused both plants and animals to grow huge.

The air was a lot different to how it is now. A human (or any modern lifeform) wouldn't be able to breath the air from that era for long. The planet changed a lot after the big one of 65 million years ago :P

Edited by Finity, 27 October 2013 - 09:25 PM.


#9    Fester John

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Posted 27 October 2013 - 11:50 PM

The size difference is because of "ozone". Ozone of that era was 200% greater than it is now. This was because there was an ice shield, or layer surrounding the earth long ago above the atmosphere. Makes you think about the great flood and such...


#10    aquatus1

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Posted 28 October 2013 - 12:04 AM

How curious, the post counts of all the people in agreement here.


#11    badeskov

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Posted 28 October 2013 - 01:19 AM

View PostJohn Jensen, on 27 October 2013 - 01:59 PM, said:

How about dealing with the obvious. ALL giant flora and fauna including Dinosaurs and Hominids in the Geological record grew to a size that was biologically feasible for the attenuated gravity of that time. A 'lighter' or 'less dense' gravitational effect ('G' force) would allow all flora and fauna to increase in relative size compared to the 'G' force of today. As ALL larger flora and fauna died out across the mid Holocene, it is logical to assume that gravity increased in 'density' during that same period. The only problem with the above logical statement, means that IF true, then Einstein was the charlatan that Tesla said he was. And that folks, puts an end to theoretical Physics because Gravity is NOT a fixed Law as Newton postulated. It's all a bunch of smoke and mirrors, and when the reality can no longer be ignored, my oh my, what will we do?

What?

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#12    aquatus1

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Posted 28 October 2013 - 02:27 AM

View PostJohn Jensen, on 27 October 2013 - 01:59 PM, said:

A 'lighter' or 'less dense' gravitational effect ('G' force) would allow all flora and fauna to increase in relative size compared to the 'G' force of today.

Why do you believe gravity would have a significant effect on plant growth?

Incidentally, G force is a metric used to indicate the force a body is subjected to during acceleration.  It has nothing to do with weight or...density.


#13    Imaginarynumber1

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Posted 28 October 2013 - 04:18 AM

WTF is going on in this thread?

I haven't seen this much stupid on UM since the two-legged dogman database thread.

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#14    Frank Merton

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Posted 28 October 2013 - 05:40 AM

My understanding is that except for the sauropods (the ones with the long necks and tails and where we understand the ecological reasons for the size) group that was long extinct before the dinosaurs disappeared most of the larger dinosaurs were on the same order of magnitude as modern mega-fauna (rhinos, hippos and of course elephants).  Some bison get up into those ranges too.

In other words there is no need to go looking for special reasons.  Evolution naturally produces a lot of variation.

It seems that oxygen levels were a good deal higher in eras preceding the dinosaurs, which produced some pretty big bugs, but that has to do with insect respiration.  The way vertebrates breathe allows big size with much less oxygen.


#15    Euphorbia

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Posted 28 October 2013 - 03:27 PM

View PostImaginarynumber1, on 28 October 2013 - 04:18 AM, said:

WTF is going on in this thread?

I haven't seen this much stupid on UM since the two-legged dogman database thread.

So, you read the thread, call people's posts stupid, and then not give an answer or an opinion?

What the hell......it's the equivalent of coming on and saying "you're wrong" and then leaving without responding to the OP....or saying why we're wrong...or even who is wrong.

Edited by Euphorbia, 28 October 2013 - 03:32 PM.

Get three coffins ready.

My mistake, four coffins.

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