HOME >> BIOLOGY >> NEWS
Math and fossils resolve a debate on dinosaur metabolism

Of the many mysteries surrounding the life history of dinosaurs, one of the more enduring is how such gigantic organisms--some reaching 42 feet tall and weighing 90 tons--regulated their body temperature. In a new study published in PLoS Biology, James Gillooly, Andrew Allen, and Eric Charnov revisit--and resolve--this debate.

Some scientists had assumed that dinosaurs, which evolved from reptiles, were cold blooded (ectotherms), whereas others thought that dinosaurs, like mammals and birds, might have been warm blooded (endotherms). Still others argued that while most dinosaurs had a metabolism similar to contemporary reptiles, the large dinosaurs managed a higher, more-constant body temperature through thermal inertia, which is how modern alligators, Galapagos tortoises, and Komodo dragons retain heat. Thermal inertia allows the body to approach homeothermy, or constant body temperature, when the ratio of body mass to surface area is high enough. If this "inertial homeothermy" hypothesis is correct, dinosaur body temperature should increase with body size.

The researchers used a model that provided estimates of dinosaur body temperature based on developmental growth trajectories inferred from juvenile and adult fossil bones of the same species. The model predicts that dinosaur body temperature did increase with body mass, and that large dinosaurs had body temperatures similar to those of modern birds and mammals, while smaller dinosaurs' temperatures were more like contemporary reptiles. These results suggest that the largest dinosaurs (but not the smaller ones) had relatively constant body temperatures maintained through thermal inertia. Gillooly et al. then compiled data from eight dinosaur species from the early Jurassic and late Cretaceous periods that ranged in size from 30 pounds to 28 tons. The growth trajectories, taken from the published research papers, were determined by using bone histology (microscopic study) and body s
'"/>

Contact: Natalie Bouaravong
press@plos.org
415-568-3445
Public Library of Science
10-Jul-2006


Page: 1 2

Related biology news :

1. Agonized death throes probable cause of open-mouthed, head-back pose of many dino fossils
2. An ancient bathtub ring of mammoth fossils
3. Microfossils unravel climate history of tropical Africa
4. Paleontologists to discuss gap fossils that link fish and land animals
5. Oldest animal fossils may have been bacteria
6. Oldest complex organic molecules found in ancient fossils
7. Embryo fossils reveal animal complexity 10 million years before Cambrian Explosion
8. Possible evidence of cell division, differentiation found in oldest known embryo fossils
9. Case Western Reserve University paleontologist discovers South American mammal fossils
10. Research into salt, oil, ice and fossils
11. Hominid fossils from Ethiopia link ape-men to more distant human ancestors

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Math and fossils resolve debate dinosaur metabolism

(Date:1/22/2015)... NXT-ID, Inc. (NASDAQ: NXTD and NXTDW) a biometric authentication ... success of the Wocket™ smart wallet at CES 2015 in ... as one of the "11 Hot Products at CES" in a review ... So Far" by Newseveryday.com and "The top 10 gadgets from CES 2015" ...
(Date:1/22/2015)... 22, 2015 Research and Markets ( ... "Global Wearable Technologies Market and Applications, Opportunities, ... and Forecast 2014-2020" report to their offering. ... devices that can be worn on the user,s ...
(Date:12/22/2014)... (NASDAQ: NXTD and NXTDW) ("NXT-ID" or the ... commerce market, announces it has retained famous pickpocket, entertainer and ... CES debut of the Wocket™ biometric smart wallet.  ... booth January 6th and 7 th , 2015, demonstrating some ...
Breaking Biology News(10 mins):CES Response for NXT-ID's Wocket Smart Wallet Kicks Off 2015 2CES Response for NXT-ID's Wocket Smart Wallet Kicks Off 2015 3Global Wearable Technologies Market and Applications, Opportunities, Industry Analysis, Segmentation, Size, Growth, Share, Overview, Trends and Forecast 2014-2020 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 3NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 4
(Date:1/22/2015)... , Jan. 22, 2015  Derma Sciences, Inc. (Nasdaq: ... focused on advanced wound care, announces that AMNIOEXCEL® ... have been added to the Premier, Inc. Regenerative ... opportunity for the AMNIOEXCEL® and AMNIOMATRIX® product lines, ...
(Date:12/24/2014)... YORK , Dec. 24, 2014 PlasmaTech Biopharmaceuticals, Inc. ... critical areas, announced the closing of an underwritten public offering ... up to an aggregate 3,500,000 shares of common stock, at ... warrant.  The warrants have a per share exercise price of ...
(Date:12/24/2014)... 2014 “Preparative & Process Chromatography ... Consumables (Columns, Solvents, Buffers, Valves, Guages, Seals), Accessories, ... - Forecasts to 2019” provides a detailed overview ... market trends, and strategies impacting the preparative and ...
(Date:12/24/2014)... SoundConnect’s 2015 next ... edge communication technology, provide continued education and inform ... series demonstrates online communication features and benefits; empowering ... most innovative and powerful tools. , According to ...
Breaking Biology Technology:Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 2Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 3Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 4Derma Sciences Expands Access of its AMNIOTIC TISSUE Product Line with New Premier, Inc. Agreement 5PlasmaTech Biopharmaceuticals, Inc. Announces Closing of Public Offering 2PlasmaTech Biopharmaceuticals, Inc. Announces Closing of Public Offering 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 2Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 4SoundConnect Launches Leading Edge Business Communications Webinar Series 2SoundConnect Launches Leading Edge Business Communications Webinar Series 3
Cached News: