[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
RE: Taking the temperature of dinosaurs?
I don't know. If this work follows the trend for other studies that have
compared automatic endotherms to bradymetabolic "ectotherms" I suspect the
results are going to show a lot of bleed over.
While Dan's paper may have cited a captive animal there are plenty of other
papers that show ectotherms behaviourally regulating high body temps to within
1-2 degrees C (a lot of work by Seebacher comes to mind).
--- On Wed, 5/26/10, John Scanlon <email@example.com> wrote:
> From: John Scanlon <firstname.lastname@example.org>
> Subject: RE: Taking the temperature of dinosaurs?
> To: email@example.com
> Date: Wednesday, May 26, 2010, 8:11 PM
> Note that the Varanus salvator paper
> Dann linked to concerned a captive
> individual in a thermal gradient, meaning a substrate at
> its preferred body
> temperature was constantly available during the study.
> There are few places
> where this would be the case year-round (or even through
> the growth season)
> in the wild.
> I think it will be very interesting to apply this 13C:18O
> method to known
> ectotherms from a range of places and times, as it'll
> provide a whole
> 'nother dimension to inferences about habitat and behaviour
> within local faunas (proxy for
> diurnal/nocturnal, heliotherm/thigmotherm) as well as
> testing/validating the
> snake-body-size palaeothermometry approach proposed in the
> case of
> Plus one of the coolest things (claimed) in the paper is
> that the method
> allows assumption-free calculation of the environmental
> delta18O, and thus
> takes the average temperature of the habitat as well as
> average for the animal concerned. I won't be surprised if
> it's possible to
> distinguish ectotherms and endotherms in many cases, when
> multiple taxa are
> compared within a fauna.
> Dr John D. Scanlon, FCD
> Riversleigh Fossil Centre, Outback at Isa
> "Get this $%#@* python off me!", said Tom laocoönically.
> -----Original Message-----
> From: Dann Pigdon [mailto:firstname.lastname@example.org]
> Sent: 26 May, 2010 11:38 AM
> To: email@example.com
> Subject: Re: Taking the temperature of dinosaurs?
> On Wed, May 26th, 2010 at 11:19 AM, "Thomas R. Holtz, Jr."
> > It is worth noting that the analysis cannot at present
> > endotherms
> > vs. ectotherms. It is just a thermometer: it is not a
> > with a
> > time component.
> > Too many people in the press about this seem to think
> > warm-blooded
> > animals actually have higher body temperatures than
> > ones.
> Indeed. Some varanids are able to regulate their body
> temperatures to about
> 35 C, with a
> precision of +/- 1 C.
> That's higher than your average monotreme (30-32 C).
> Dann Pigdon
> GIS Specialist
> Australian Dinosaurs
> Melbourne, Australia