[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

BIPEDALITY & ENDOTHERMY



Hi listers, just found this..

THE RELATIONSHIP BETWEEN BIPEDALITY AND ENDOTHERMY: IMPLICATIONS FOR
DINOSAURIAN METABOLISM. HETHERINGTON, T.E. Ohio State Univ., Columbus.

Protodinosaurs, primitive dinosaurs, and many derived dinosaurs showed
strong tendencies toward bipedalism. Several factors suggest that
obligatory bipedality requires endothermic metabolism, including: 1)
All extant bipeds are endothermic. 2) All extant and dinosaurian
bipeds show limb and axial skeleton specializations for sustained
locomotory activity, a basic correlate of endothermy. 3) The increased
instability of bipedal locomotion may require a high level of
neuromuscular coordination that can be achieved consistently only by
elevated metabolic rates. Some lizards can run bipedally but not at
suboptimal body temperatures. Obligatory bipedalism may be an
infeasible strategy of locomotion for ectotherms. 4) Relative brain
size in bipedal dinosaurs is generally 2-10 times that of quadrupedal
species and comparable to that of ratite birds. This may correlate
with a lifestyle centred on sustained activity and endothermy. The
bipedal tendencies of the earliest dinosaurs suggests that dinosaurs
were at least originally an endothermic lineage.

This is from _American Zoologist_ 32: 145A (1992).

I also found an abstract by Emily Giffin, but don't seem to have it on
me. Can somebody please post the reference for the Giffin paper that
Greg Paul cited the other day? Thanks.

"Kind of short for a stormtrooper aren't you?"
"There is good in him, I've felt it"

DARREN NAISH
dwn194@soton.ac.uk