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Re: Function Talks at Ostrom Symposium
In a message dated 2/20/99 1:32:53 AM Eastern Standard Time,
1) > How certain is it that dinosaurs WERE diaphragm breathers? And
2) > why would the transition
> forms (IF dinosaurs were diaphragm breathers) be selected for a
> diaphragmatic hernia?
Hi Dwight, thanks for replying.
1) Dinosaurs as diaphragm breathers is discussed in the 1/22 Science on p.
2) What Ruben et al. meant is since birds are not diaphragm breathers a
diaphragm breathing ancestor for birds would have to rupture its diaphragm to
gradually eliminate it and breath without one. However, you try breathing with
a ruptured diaphragm! Such a debilitating condition would immediately
compromise the entire pulmonary ventilatory apparatus and seems unlikely to
have been of any selective advantage.
Hope that helps,