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Re: New Tyrannosaurus Study

Check out the taxon list, seriously check it out (just the herbivore list here):

Parksosaurus warreni Hypsilophodontidae 55 75 (49.3%)
Prenocephale edmontonensis Pachycephalosauridae 85
Ornithomimus velox Ornithomimosauridae 155 216 (36.8%)
Struthiomimus sp. Ornithomimosauridae 175
Thescelosaurus garbanii Hypsilophodontidae 250
Thescelosaurus neglectus Hypsilophodontidae 250
Leptoceratops gracilis Leptoceratopsidae 250
Montanoceratops sp. Leptoceratopsidae 550 700 (6.0%)
Pachycephalosaurus wyomingensis Pachycephalosauridae 850
Edmontosaurus annectens Hadrosauridae 2500 2500 (6.7%)
Edmontosaurus regalis Hadrosauridae 2500
Edmontosaurus saskatchewanensis Hadrosauridae 2500
Lambeosaurus sp. Hadrosauridae 2500
Parasaurolophus walkeri Hadrosauridae 2500
Edmontonia rugosidens Nodosauridae 2500
Ankylosaurus magniventris Ankylosauridae 5500 5000 (0.6%)
Triceratops horridus Ceratopsidae 8500 8500 (0.4%)
Alamosaurus sanjuanensis Saltasauridae 25 000 25 000 (0.2%)

"our species list is treated as representing a consistent sympatric faunal unit 
across this region for the purposes of analysis"

Triceratops alongside Parasaurolophus & Lambeosaurus (but no Hypacrosaurus)? 
Where is T. prorsus? E rigosidens, but no Denversaurus? Why some taxa from the 
DPFm but not all? who knows?

How does stuff like this get past review?

Denver Fowler

----- Original Message ----
From: Terry Davis Jr <tyrannosaurtj@gmail.com>
To: dinosaur@usc.edu
Sent: Wed, 26 January, 2011 8:44:50
Subject: New Tyrannosaurus Study

Carbone, C., Turvey, S., & Bielby, J. (2011). Intra-guild competition and
its implications for one of the biggest terrestrial predators, Tyrannosaurus
rex Proceedings of the Royal Society B: Biological Sciences

Abstract: Identifying tradeoffs between hunting and scavenging in an
ecological context is important for understanding predatory guilds. In the
past century, the feeding strategy of one of the largest

terrestrial carnivores, Tyrannosaurus rex, has been the subject of much
debate: was it an active predator or an obligate scavenger? Here we look at
the feasibility of an adult T. rex being an obligate scavenger in the
environmental conditions of Late Cretaceous North America, given the size
distributions of sympatric herbivorous dinosaurs and likely competition with
more abundant small-bodied theropods. We predict that nearly 50 per cent of
herbivores would have been within a 55-85 kg range, and calculate based on
expected encounter rates that carcasses from these individuals would have
been quickly consumed by smaller theropods. Larger carcasses would have been
very rare and heavily competed for, making them an unreliable food source.
The potential carcass search rates of smaller theropods are predicted to be
14-60 times that of an adult T. rex. Our results suggest that T. rex and
other extremely large carnivorous dinosaurs would have been unable to
compete as obligate scavengers and would have primarily hunted large
vertebrate prey, similar to many large mammalian carnivores in modern-day

And link to free PDF:

Enjoy! :D

Terry "Tyrannosaur" Davis Jr
Jurassic Park Legacy Owner/Founder
1332 24th St NW
Canton, OH 44709
Mobile: 330-949-7343