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Re: cause of Gigantism in sauropods
The notion that the measurement of average prey/predator size ratio in
today's world delineates as a matter of scientific principle a null
hypothesis about the behavioral interaction between giant sauropods and
giant theropods is just that -- a notion, otherwise known as an opinion.
The laws of physics directly constrain certain activities (e.g.,
locomotion, bite force), and data from extant animals can indeed form a
null, but this principle does not extend to behavior.
Alligators are tactically capable of eating people, but statistically
rarely do -- taking that data to form a null hypothesis about the
behavior of the similarly capable Nile Crocodile, or even individual
alligators, is unlikely to prove useful.
The data, both extant and fossil, tell us that -- 1) giant theropod jaws
could encompass the necks of even very large sauropods, 2) bite force
was such that one full-on bite to any portion of the neck and head was
likely to be mortal, 3) the mobility of the giant theropods on hard,
flat ground was (barring anomalous and unexpected giant sauropod
locomotive capability) overwhelmingly superior, and 4) the likely
relative nutritional requirements of the respective morphologies meant
that time was very much on the theropod's side in any protracted engagement.
Ignoring tactical capacity on grounds of conjectured behavioral
limitations when evaluating the possible evolutionary paths by which
this coeval morphological couplet came into full flower is neither
useful nor "scientific".