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Re: Dinosaur long bone blood flow



Here is the abstract:

The cross-sectional area of a nutrient foramen of a long bone is
related to blood flow requirements of the
internal bone cells that are essential for dynamic bone remodelling.
Foramen area increases with body size
in parallel among living mammals and non-varanid reptiles, but is
significantly larger in mammals.
An index of blood flow rate through the foramina is about 10 times
higher in mammals than in reptiles,
and even higher if differences in blood pressure are considered. The
scaling of foramen size correlates well
with maximum whole-body metabolic rate during exercise in mammals and
reptiles, but less well with
resting metabolic rate. This relates to the role of blood flow
associated with bone remodelling during
and following activity. Mammals and varanid lizards have much higher
aerobic metabolic rates and exer-
cise-induced bone remodelling than non-varanid reptiles. Foramen areas
of 10 species of dinosaur from
five taxonomic groups are generally larger than from mammals,
indicating a routinely highly active and
aerobic lifestyle. The simple measurement holds possibilities offers
the possibility of assessing other
groups of extinct and living vertebrates in relation to body size,
behaviour and habitat.

-- Mike.


On 6 July 2011 17:11, bh480@scn.org <bh480@scn.org> wrote:
> From: Ben Creisler
> bh480@scn.org
>
> From: Ben Creisler
> bh480@scn.org
>
> New online article:
>
> Roger S. Seymour, Sarah L. Smith, Craig R. White, Donald M. Henderson, and
> Daniela Schwarz-Wings (2011)
> Blood flow to long bones indicates activity metabolism in mammals, reptiles
> and dinosaurs.
> Proceeding of the Royal Society B (advance online publication)
> DOI:10.1098/rspb.2011.0968
> http://rspb.royalsocietypublishing.org/content/early/2011/06/29/rspb.2011.09
> 68.abstract
>
> Unfortunately, the abstract link currently goes to a blank page. Don't know
> what the problem is.
> Main link:
> http://rspb.royalsocietypublishing.org/content/firstcite
>
> Supp. is free:
> http://rspb.royalsocietypublishing.org/content/early/2011/06/29/rspb.2011.09
> 68/suppl/DC1
>
> Lacking the abstract, here is an online discussions of the article:
>
> Bone holes suggest active dinosaurs
> http://blogs.discovermagazine.com/notrocketscience/2011/07/05/bone-holes-sug
> gest-active-dinosaurs/
>
>
>
>
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