Maximum size a mammal could grow to?

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Discussion Overview

The discussion revolves around the maximum size that mammals could potentially grow to, with a focus on the implications of the square-cube law and various biological and ecological factors influencing size. Participants explore theoretical limits, historical examples, and the relationship between size and strength.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants reference the square-cube law to argue that as an animal's size increases, its strength decreases relative to its mass.
  • One participant questions the initial assumption about strength and suggests that the strength-to-mass ratio is more relevant, noting that larger animals like elephants have greater strength than smaller ones like humans.
  • A participant mentions a paper indicating that the maximum speed of organisms is proportional to body length, which may relate to size limits.
  • Another participant proposes examining historical large mammals to understand why they reached certain sizes and did not grow larger, considering ecological factors.
  • One participant humorously suggests that the discussion resembles a game of comparing species, emphasizing the ecological niches that different species occupy.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the square-cube law and the factors that determine maximum size. There is no consensus on the maximum size a mammal could grow to, and multiple competing perspectives remain throughout the discussion.

Contextual Notes

The discussion includes assumptions about strength and mass that are not universally accepted, and there are unresolved questions regarding the ecological and evolutionary factors influencing size limits.

Who May Find This Useful

This discussion may be of interest to those studying biology, ecology, evolutionary theory, and physics, particularly in relation to the physical constraints on animal size.

parshyaa
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I have a presentation on square cube law. But i don't have any numerical data to show.
How could i find the maximum size a animal could go. I know that by using square cube law we could say that greater the size of animal goes lesser its strength becomes. But how could i find the numerical datas for maximum size of humans,elephants,dinosaurs etc.could you help me.
 
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parshyaa said:
I know that by using square cube law we could say that greater the size of animal goes lesser its strength becomes.
I'm not really sure how you come about this.
parshyaa said:
But how could i find the numerical datas for maximum size of humans,elephants,dinosaurs etc.could you help me.
Have you seen this paper? It shows that the maximum speed of organisms is roughly proportional to body length across more than 20 orders of magnitude.
http://aapt.scitation.org/doi/full/10.1119/1.4917310
 
NFuller said:
I'm not really sure how you come about this.
Take two cubes, take 2nd cube exactly doubled in size then cube1(i.e length of cube1= l and that of cube2= 2l)
Now strength for a human/living body is defined as [strength = surface area/volume]
Then strength of cube1 =6/l and
strength of cube2 = 3/l
Therefore
Although the size of cube2 is double of cube1 but its strength is half of cube1
{Ie st.cube1 = 2(str.cube2)}
Therefore greater the size lesser would be the strength.

https://en.m.wikipedia.org/wiki/Square
 
parshyaa said:
But i don't have any numerical data to show.
Have you tried Google?
Blue whales can grow to the size they do because the water supports them.
 
parshyaa said:
Therefore greater the size lesser would be the strength.
I think you mean the greater the size the lesser the strength to mass ratio. The strength of an elephant is obviously greater than that of a human.

The issue is that the ability of an animal to move its own weight seems roughly constant across a broad scale, as shown in the article in post #2. This causes me to question the validity of your initial assumption.

If your just looking for an upper bound on mammal size, then there are more factors to consider than just muscle mass as sophiecentaur has pointed out.
 
One approach to this question might be to take a look at several of history's largest mammals. Ask why they were that large and none or few got any larger. How did they do in their eco-system? Why were they large? Why weren't they larger? How did they fare against smaller mammals or against non-mammals?

Seems you could proceed in any of a number of directions from there.

diogenesNY
 
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This is another game of PF Top Trumps, I think. :smile:
All successful species occupy their own Ecological Niche. Elephants are doing favours for Dung Beetles all the time and vice versa.
 

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