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 For Some, Care May Be Withdrawn Too Soon After Cardiac Arrest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:8/22/2017)... ... ... of the past six years, Lightning Labels has sent out a call for users of ... variety and creativity of their designs. Submissions this year were open from May 18 to ... announce the winners of the sixth annual Photo Contest, along with the prizes they've received:, ...
(Date:8/22/2017)... ... ... Star Glass is new to the Texas market, but is proudly managed by widely recognized ... and models, in Grand Prairie, TX, located in the center of the DFW Metroplex, the ... business for the past 40 years with 32 convenient locations in Texas, Nevada and California ...
(Date:8/22/2017)... ... August 22, 2017 , ... “Without Love’s Beauty and ... and the struggles faced while hoping for a better life. “Without Love’s Beauty ... Von Bernewitz, who spent 13 years working with deprived/neglected adolescents and almost 20 ...
(Date:8/22/2017)... ... August 22, 2017 , ... John Stewart ... and Managing Member for t4 Leadership Development & Consulting. He has spent his ... of “success”: physician leadership development, servant leadership, data driven process improvement, and supportive ...
(Date:8/22/2017)... ... 22, 2017 , ... Although Labor Day is not as popular for fireworks ... weekend displays, and numerous households celebrate the unofficial end of summer with backyard fireworks ... pets. , Kris Zambo, owner of Dynamite Fireworks in Hammond, Indiana, ...
Breaking Medicine News(10 mins):
(Date:8/17/2017)... , August 17, 2017 DarioHealth ... Company with mobile health and big data solutions, ... agreements with domestic and non-U.S. investors for the ... and shares of the Company,s newly designated Series ... offerings. The Company expects to conduct a closing ...
(Date:8/15/2017)... , Aug. 15, 2017 Diplomat Pharmacy, ... to Michigan residents. ... Flint retail pharmacy, G-3320 Beecher Road. ... by the Food and Drug Administration, is intended to ... drowsiness, slowed breathing, and loss of consciousness. The medication ...
(Date:8/15/2017)... 15, 2017  AOTI Inc. announced today that its fully owned ... recently opened a New York City Office in Yonkers, ... unique Topical Wound Oxygen (TWO 2 ) homecare therapy. This new ... for Health Care (ACHC) under the company,s DMEPOS accreditation for Home/Durable ... Advanced ...
Breaking Medicine Technology: