Navigation Links
Mammals Grew Big After Dinosaurs Died Off: Analysis
Date:11/25/2010

THURSDAY, Nov. 25 (HealthDay News) -- Mammals began to grow much larger after dinosaurs became extinct 65 million years ago, a new study suggests.

An international team of researchers analyzed the fossils of major groups of land mammals on each continent and found that their size increased from a maximum of about 10 kilograms (22 pounds) when they shared the Earth with dinosaurs to a maximum of 17 tonnes (18.7 U.S. tons) after dinosaurs became extinct.

"Basically, the dinosaurs disappear and all of sudden there is nobody else eating the vegetation. That's an open food source and mammals start going for it, and it's more efficient to be an herbivore when you're big," study co-author Jessica Theodor, an associate professor in the biological sciences department at the University of Calgary, said in a university news release.

The findings also show that the global ecosystem is able to reset itself relatively quickly.

"You lose dinosaurs 65 million years ago, and within 25 million years the system is reset to a new maximum for the animals that are there in terms of body size. That's actually a pretty short time frame, geologically speaking. That's really rapid evolution," Theodor said.

The study is published in the Nov. 25 issue of the journal Science.

More information

The Smithsonian Institution National Museum of Natural History explains how mammals evolved.

-- Robert Preidt

SOURCE: University of Calgary, news release, Nov. 25, 2010


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Page: 1

Related medicine news :

1. Kids ER Visits Down After Cold Medicine Withdrawal
2. Assessment tool predicts blood clot risk after plastic surgery
3. HIV Patients Do Well After Kidney Transplants: Study
4. Higher Plavix Dose Wont Boost Outcomes After Stent Placement: Study
5. Sponges, Surgical Tools Sometimes Left in Kids After Operation
6. Research uncovers extensive natural recovery after spinal cord injury
7. For Some, Care May Be Withdrawn Too Soon After Cardiac Arrest
8. Study suggests physicians wait longer for brain recovery after hypothermia Rx in cardiac arrest
9. Key player in detoxification pathway isolated after decades of searching
10. Louisiana State University Health Sciences Center research shows fish oil component given up to 5 hours after stroke limits brain damage
11. Cooling may benefit children after cardiac arrest
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Mammals Grew Big After Dinosaurs Died Off: Analysis
(Date:2/5/2016)... (PRWEB) , ... February 05, 2016 , ... Steven Tonkinson, ... he has completed every year since it started in 2003. This year, he ran ... attention of fellow runners and NBA team the Miami Heat. , This Sunday, while ...
(Date:2/5/2016)... ... February 05, 2016 , ... Today, the Whole-Food Warrior TV show, ... much-anticipated feature with author Jahnavi Foster, specialist in healthy vegetarian cuisine, will stream on ... week, on his weekly Whole-Food Warrior TV show, Frank Davis highlights Whole-Food Warriors - ...
(Date:2/5/2016)... ... 05, 2016 , ... The Muscular Dystrophy Association and Sailormen ... the 14th annual “Appetite for a Cure” campaign on Feb. 1 to raise ... related diseases that severely limit strength and mobility. , Now through March ...
(Date:2/5/2016)... ... February 05, 2016 , ... ... George H. Van Allen have signed a joint enrollment and degree completion agreement. ... pathway toward associate and baccalaureate degrees at FHU|Dickson. , The agreement allows ...
(Date:2/5/2016)... ... 2016 , ... US Sports Camps , official operators of Nike Yoga ... kids yoga training. ChildLight Yoga Studio is centrally situated in the picturesque New England ... Yoga Studio founder Lisa Flynn expresses her excitement, “We are thrilled to be partnering ...
Breaking Medicine News(10 mins):
(Date:2/4/2016)... Wegener Polyangiitis - Pipeline Review, H2 ... Polyangiitis - Pipeline Review, H2 2015, provides an ... This report provides comprehensive information on the therapeutic ... at various stages, therapeutics assessment by drug target, ... and molecule type, along with latest updates, and ...
(Date:2/4/2016)... Frontier Pharma: Chronic Obstructive Pulmonary Disease ... Chronic Obstructive Pulmonary Disease (COPD) is ... the airways and lungs. Persistent breathing difficulties and ... one of the leading causes of morbidity and ... COPD is linked to cumulative exposure to risk ...
(Date:2/4/2016)... 2016 In response to the opioid abuse epidemic, ... for Medical Products and Tobacco, along with other FDA leaders, ... approach to opioid medications. The plan will focus on policies ... pain access to effective relief. --> ... Re-examine the risk-benefit paradigm for opioids and ensure that the ...
Breaking Medicine Technology: