Navigation Links
Iowa State University researcher's work on gender, temperature link in reptiles published in Nature
Date:1/22/2008

AMES, Iowa An Iowa State University researcher who spent four years in Australia studying reptiles is having his findings published in the journal Nature this week.

Nature is an international, peer-reviewed, interdisciplinary journal of science, and is the most-cited weekly science journal in the world.

Dan Warner, a researcher in the ecology, evolution and organismal biology department, has been working with the jacky dragon, a lizard found in Australia, to discover if egg incubation temperature and gender affects the viability of the lizards.

In mammals, gender is determined by the chromosomes an embryo inherits from the father -- Y dictates the offspring will be male, X means female. The mother always contributes an X chromosome.

In some species of reptiles, the gender of the offspring is determined by the temperature the embryos experience during development.

Warners research explored whether the temperatures at which the lizards were born was the best climate for each of the two genders.

This was a hypothesis that was proposed in 1977, said Warner. But no one had conducted a complete experimental test of the hypothesis until now.

Warner tracked males and females born at different temperatures and measured how well they reproduced. Because some temperatures only produce one gender, Warner had to reverse the sex of some of the embryos using hormones.

In the jacky dragon, males were born at around 77 to 86 degrees, while females were born at temperatures both above and below that range.

Warner found that jacky dragons, both male and female, thrive when they are born at the right temperatures for their gender.

Males reproduce more when they are exposed to the right egg incubation temperatures for them, 25 to 30 degrees Celsius (77-86 F), said Warner. The same is true for females when born at their ideal temperatures.

The studys findings may have grave consequences for the species if temperatures increase in the parts of Australia where the jacky dragons call home.

We may see a sex ratio shift towards one sex, said Warner. And that may threaten population viability.

Warner also notes that species may have a way of adapting.

The lizards may compensate by moving to cooler places, digging nests deeper in the sand or other ways to stay cooler, said Warner.


'/>"/>

Contact: Dan Warner
dwarner@iastate.edu
515-294-1968
Iowa State University
Source:Eurekalert

Related medicine news :

1. Combination therapy improves survival for certain prostate cancer patients
2. Hormone Therapy Only Helps Some Older Men With Prostate Cancer
3. Pros, cons of drug proven to prevent prostate cancer should be considered, researchers recommend
4. Mislabeled Supplement Spurred Prostate Cancer: Report
5. Statehouse Atrium to be Site for Childrens Dental Access Event - Ohio Legislators to Mingle With Children and Dentists for This Free Care Event!
6. Mislabled Supplement Spurred Prostate Cancer: Report
7. Enlarged Prostate Treatment Study Shows Combination of AVODART(R) and Tamsulosin Provides Greater Benefit Than Either Medication Alone
8. Bradley Pharmaceuticals Announces Filing of Definitive Proxy Statement for Special Meeting of Stockholders to Approve Merger With Nycomed
9. Susan G. Komen for the Cure, State Lawmakers, Breast Cancer Survivors, Celebrities and Activists Call on Legislature to Strengthen Breast Cancer Screening Program for Underserved Women
10. States Patient Safety Report a Valuable Tool For Hospitals Quality Improvement Work
11. Just hours apart, 2 brothers undergo robotic prostate cancer surgery
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... October 13, 2017 , ... Lori R. Somekh, founder of ... ElderCounsel, a national organization of elder law and special needs planning attorneys. “Membership in ... It also provides a forum to network with elder law attorneys nationwide,” said Somekh. ...
(Date:10/13/2017)... ... October 13, 2017 , ... The Visiting Nurse Association ... Featuring a collection of specialty vendors and unique items from across the nation, this ... health and wellness services offered by the VNA. The boutique will be open ...
(Date:10/13/2017)... ... October 13, 2017 , ... Yisrayl Hawkins, Pastor and Overseer at The House ... most popular and least understood books in the Holy Scriptures, Revelation. The Book of ... baffled scholars for centuries. Many have tossed it off as mere rubbish, but Yisrayl ...
(Date:10/13/2017)... ... 13, 2017 , ... “The Journey: From the Mountains to the Mission Field”: ... souls in the Philippines. “The Journey: From the Mountains to the Mission Field” is ... Bible. She has taught all ages and currently teaches a class of ladies at ...
(Date:10/12/2017)... (PRWEB) , ... October 12, 2017 , ... ... are now treating sleep apnea using cutting-edge Oventus O2Vent technology. As ... serious sleep disorder characterized by frequent cessation in breathing. Oral appliances can offer ...
Breaking Medicine News(10 mins):
(Date:9/28/2017)... , Sept. 28, 2017 Hill-Rom Holdings, ... 2017 earnings conference call and webcast on Friday, November ... a.m. (EDT) and ending at approximately 8:30 a.m. (CDT) ... discussing the company,s 2017 financial performance and guidance for ... opportunities, initiatives to enhance operational performance, and long-range financial ...
(Date:9/27/2017)... Israel and NEW YORK , Sept. 27, ... with mobile health and big data solutions, today announced that its MyDario ... Please check your local TV listings for when The Dr. Oz Show ... ... season this month. ...
(Date:9/23/2017)... -- Janssen Biotech, Inc. (Janssen) announced today that it ... Food and Drug Administration (FDA) for the Biologics License ... of moderately to severely active rheumatoid arthritis (RA). The ... to further evaluate the safety of sirukumab in the ... "We are disappointed by ...
Breaking Medicine Technology: