Navigation Links
Dinosaurs Had Teen Pregnancies, Too
Date:1/21/2008

Findings show that, like humans, they reached sexual maturity early to improve odds of survival

MONDAY, Jan. 21 (HealthDay News) -- Dinosaurs experienced rapid growth during adolescence and reached sexual maturity near the end of this growth spurt, before they reached maximum body size, say University of California, Berkeley, scientists.

They noted that humans and other medium-to-large mammals are also able to reproduce before they finish growing. This does not occur in reptiles.

This finding about dinosaurs suggests that they suffered high death rates as adults, which made sexual maturity at an early age necessary for species survival. The study was published online in the journal Proceedings of the National Academy of Sciences.

"This is an exciting finding, because age at sexual maturity is related to so many things. It also shows that you can't use reptiles as a model for dinosaur growth, as many scientists still do," Kevin Padian, a professor of integrative biology and a curator in UC Berkeley's Museum of Paleontology, said in a prepared statement. He was adviser to the students -- Sarah Werning and Andrew H. Lee -- who conducted the study.

Werning and Lee analyzed fossilized bones from adolescent female dinosaurs and identified a layer of calcium-rich bone tissue (medullary bone) that's deposited in the marrow cavity just before egg-laying as a resource for making eggshells. This showed the dinosaurs were sexually mature.

Medullary bone is found in female birds.

"We were lucky to find these female fossils. Medullary bone is only around for three to four weeks in females who are reproductively mature, so you'd have to cut up a lot of dinosaur bones to have a good chance of finding this," Werning said in a prepared statement.

More information

The Dinosaur Institute at the Natural History Museum of Los Angeles County has more about dinosaur reproduction and development.



-- Robert Preidt



SOURCE: University of California, Berkeley, news release, Jan. 14, 2008


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved  

Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Dinosaurs Had Teen Pregnancies, Too
(Date:10/13/2017)... ... ... “America On The Brink”: the Christian history of the United States and the loss ... author, William Nowers. Captain Nowers and his wife, Millie, have six children, ten ... the Navy. Following his career as a naval aviator and carrier pilot, he ...
(Date:10/12/2017)... Orleans, LA (PRWEB) , ... October 12, 2017 , ... ... centers in the U.S., announced today its plans to open a flagship location in ... will occupy the former Rooms To Go store next to Office Depot in the ...
(Date:10/12/2017)... MD (PRWEB) , ... October 12, 2017 , ... The ... of Excellence to Carol Friedman, PhD, FACMI, during the Opening Session of AMIA’s Annual ... – 8. , In honor of Morris F. Collen, a pioneer in the field ...
(Date:10/12/2017)... ... October 12, 2017 , ... Dr. Parsa Mohebi, the ... medical article to the newly revamped Cosmetic Town journal section, featuring ... transplant procedure known as Follicular Unit Extraction (FUE). , Dr. Mohebi ...
(Date:10/12/2017)... ... October 12, 2017 , ... On Saturday, October 21, the Health & ... by Moonlight to raise money for the American Heart Association Heart Walk. Teams of ... will work together to keep their treadmills moving for 5 hours. Treadmills will start ...
Breaking Medicine News(10 mins):
(Date:10/4/2017)... the Centers for Disease Control and Prevention (CDC), influenza vaccination should ... helping communities across Massachusetts , Connecticut ... shots through the end of the month. *Some exclusions apply ... ... is by the end of October, according to the Centers for Disease ...
(Date:10/2/2017)... Fla. , Oct. 2, 2017  AllianceRx Walgreens ... company formed by Walgreens and pharmacy benefit manager Prime ... its new brand, which included the unveiling of new ... , as well as at a few other ... the new brand to patients, some of whom will ...
(Date:9/28/2017)... WASHINGTON , Sept. 28, 2017 Cohen ... to advance the use of wearable and home sensors ... brain disorders. Early Signal Foundation, a nonprofit organization focused ... populations, will provide an affordable analytical system to record ... ...
Breaking Medicine Technology: