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Re: Brrr, bone chilling paleopolar summers(Polar dinosaur growth and other new papers)
On Mon, Aug 8th, 2011 at 12:49 PM, Augusto Haro <email@example.com> wrote:
> 2011/8/7 Jaime Headden <firstname.lastname@example.org>:
> > Your inference here, then, is that marine reptiles migrated, which would
> > imply they have a
> similar metabolic constraint and allowance as marine mammals do which also
> You mean, similar metabolic constraint and allowance in what sense?
> Because Dermochelys is very active, yet have a basal metabolic rate
> well below that of a similarly sized mammal, and it has been described
> as migratory (http://www.seaturtle.org/PDF/James_2005_EcolLett.pdf).
Great White sharks are also considered migratory, crossing from Australia to
South Africa and
back again. I can imagine that Mesozoic marine reptiles may have had similar
Great Whites or tuna, allowing for functional homeothermy without the need for
a high metabolism.
The number of juvenile marine reptile fossils found in South Australia suggests
that they may
have used the cold waters of the ancient inland sea as a breeding ground. These
are the same
ocean deposits that glacial drop-stones have been identified from.
Kear, B. P., 2006: Marine reptiles from the Lower Cretaceous of South
Australia: elements of a
high-latitude cold water assemblage. Palaeontology 49, 837-856.
Kear, B. P., Schroeder, N. I., Vickers-Rich, P. & Rich, T. H., 2006: Early
Cretaceous high latitude
marine reptile assemblages from southern Australia. Paludicola 5, 200-205.
Kear, B. P., 2005: Marine reptiles from the Lower Cretaceous (Aptian) deposits
of White Cliffs,
southeastern Australia: implications of a high-latitude cold water assemblage.
Research 26, 769-782.
Spatial Data Analyst Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj