Navigation Links
New evidence for warm-blooded dinosaurs
Date:7/18/2013

University of Adelaide research has shown new evidence that dinosaurs were warm-blooded like birds and mammals, not cold-blooded like reptiles as commonly believed.

In a paper published in PLoS ONE, Professor Roger Seymour of the University's School of Earth and Environmental Sciences, argues that cold-blooded dinosaurs would not have had the required muscular power to prey on other animals and dominate over mammals as they did throughout the Mesozoic period.

"Much can be learned about dinosaurs from fossils but the question of whether dinosaurs were warm-blooded or cold-blooded is still hotly debated among scientists," says Professor Seymour.

"Some point out that a large saltwater crocodile can achieve a body temperature above 30C by basking in the sun, and it can maintain the high temperature overnight simply by being large and slow to change temperature.

"They say that large, cold-blooded dinosaurs could have done the same and enjoyed a warm body temperature without the need to generate the heat in their own cells through burning food energy like warm-blooded animals."

In his paper, Professor Seymour asks how much muscular power could be produced by a crocodile-like dinosaur compared to a mammal-like dinosaur of the same size.

Saltwater crocodiles reach over a tonne in weight and, being about 50% muscle, have a reputation for being extremely powerful animals.

But drawing from blood and muscle lactate measurements collected by his collaborators at Monash University, University of California and Wildlife Management International in the Northern Territory, Professor Seymour shows that a 200 kg crocodile can produce only about 14% of the muscular power of a mammal at peak exercise, and this fraction seems to decrease at larger body sizes.

"The results further show that cold-blooded crocodiles lack not only the absolute power for exercise, but also the endurance, that are evident in warm-blooded mammals," says Professor Seymour.

"So, despite the impression that saltwater crocodiles are extremely powerful animals, a crocodile-like dinosaur could not compete well against a mammal-like dinosaur of the same size.

"Dinosaurs dominated over mammals in terrestrial ecosystems throughout the Mesozoic. To do that they must have had more muscular power and greater endurance than a crocodile-like physiology would have allowed."

His latest evidence adds to that of earlier work he did on blood flow to leg bones which concluded that the dinosaurs were possibly even more active than mammals.


'/>"/>

Contact: Roger Seymour
roger.seymour@adelaide.edu.au
61-883-135-596
University of Adelaide
Source:Eurekalert

Related biology news :

1. Evidence suggests Antarctic crabs could be native
2. ACRG and BGI report new evidence for the genetic bases of liver cancer
3. First international collaboration to showcase latest body of evidence of dairy health benefits
4. First evidence that the genome can adapt to temperature changes
5. Evidence of host adaptation of avian-origin influenza A virus
6. New evidence on how fluoride fights tooth decay
7. AACR news: Studies show increasing evidence that androgen drives breast cancer
8. New evidence dinosaurs were strong swimmers
9. New evidence shows PubMed Central undermines journal usage
10. New evidence that comets could have seeded life on Earth
11. Increasing evidence links high glycemic index foods and dairy products to acne
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/19/2016)... 2016 The new GEZE SecuLogic ... web-based "all-in-one" system solution for all door components. It ... the door interface with integration authorization management system, and ... The minimal dimensions of the access control and the ... installations offer considerable freedom of design with regard to ...
(Date:4/14/2016)... BioCatch ™, the global ... the appointment of Eyal Goldwerger as CEO. ... Goldwerger,s leadership appointment comes at a time of significant ... of its platform at several of the world,s largest ... unique cognitive and physiological factors, is a winner of ...
(Date:3/31/2016)... March 31, 2016  Genomics firm Nabsys has completed ... Barrett Bready , M.D., who returned to the ... original technical leadership team, including Chief Technology Officer, ... Development, Steve Nurnberg and Vice President of Software and ... company. Dr. Bready served as CEO of ...
Breaking Biology News(10 mins):
(Date:4/29/2016)... ... , ... Intelligent Implant Systems announced today that the two-level components for the ... United States. These components expand the capabilities of the system and allow Revolution™ ... October of 2015, the company has seen significant sales growth in 1Q 2016, and ...
(Date:4/28/2016)... 28, 2016 Q BioMed ... Company,s CEO  was featured in an article he ... VCs Fear To Tread: http://www.lifescienceleader.com/doc/accelerators-enter-when-vcs-fear-to-tread-0001 ... is an essential business journal for life ... biotechs to Big Pharmas. Their content is designed ...
(Date:4/28/2016)... ... April 28, 2016 , ... As part of an ... experts, and expanding its LATAM network and logistics capabilities. Enhancements have been ... their clinical trial projects. , The expansion will provide unmatched clinical trial logistics ...
(Date:4/27/2016)... ... April 27, 2016 , ... Shimadzu Scientific Instruments (SSI) ... 2016 Marijuana Business Conference and Expo. Shimadzu’s high-performance instruments enable laboratories to test ... Expo attendees can stop by booth 1021 to learn how Shimadzu’s instruments can ...
Breaking Biology Technology: