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RE: sauropods: homotherm,heterotherm or gigantotherm?

Very good question.

Dolphins do get their air from a completely different source which requires
regular penetration of the air-sea barrier.


-----Original Message-----
From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu] On Behalf Of
Mike Taylor
Sent: Thursday, September 15, 2005 11:15 AM
To: rmtakata@gmail.com
Cc: david.marjanovic@gmx.at; dinosaur@usc.edu
Subject: Re: sauropods: homotherm,heterotherm or gigantotherm?

> Date: Thu, 15 Sep 2005 11:39:00 -0300
> From: Roberto Takata <rmtakata@gmail.com>
>>> Try swim... It costs more energy than walk or run in air.
>> Reference, please!
> If I'm not wrong:
> Williams, T.M. 1999. The evolution of cost-efficient swimming in 
> marine mammals: Limits to energetic optimization. Phil. Trans. R. Soc.
> Lond. B 354, 193-201.
> (Well actually she says that specialists in different locomotion mode 
> expend more or less the same amount of energy by a given traveled 
> distance - at least between mammals - okay, we are not whale shark...)

That is a very strange paper.  Its figure 3a suggest (in agreement with
Greg's message) that the locomotion of terrestrial mammals is indeed about
five or six times as energetic as that of similarly sized fish; but that
marine mammals are about as efficient as terrestrial mammals.  The bizarre
but inescapable corrolary is that fish locomote at a sixth the energy cost
as same-sized marine mammals.  Can that really be true?  Are dolphins that

 _/|_    ___________________________________________________________________
/o ) \/  Mike Taylor  <mike@miketaylor.org.uk>  http://www.miketaylor.org.uk
)_v__/\  Women ...  They're less trouble than they're worth.