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:12/2/2016)... ... ... Lori G. Cohen and Sara K. Thompson , shareholders in ... Conference Institute’s 21st Drug & Medical Device Litigation Conference , taking place in New ... Cohen, who chairs the firm’s Pharmaceutical, Medical Device & Health Care Litigation Practice and ...
(Date:12/2/2016)... (PRWEB) , ... December 02, 2016 , ... ... across the Dothan-Wiregrass Area in Alabama are expected to attend the UNCF Dothan-Wiregrass ... will help provide scholarship funds for area students and operating support to UNCF-member ...
(Date:12/2/2016)... ... 2016 , ... The annual time frame to change Medicare health and prescription ... December 7th. Currently-enrolled Medicare beneficiaries who are looking to switch from their current plan ... to make changes during this period order for their new policy to go into ...
(Date:12/2/2016)... , ... December 02, 2016 , ... ... Beverly Hills, California, will be included in the 2016 “Guide to America’s Top ... professionals based on the amalgamation of their education, experience, and professional associations. ...
(Date:12/2/2016)... ... December 02, 2016 , ... The PAINWeekEnd Regional Conference will ... Spa in Honolulu, offering local frontline clinicians the opportunity to extend their certified ... demand for supplemental training related to pain management has surged dramatically in recent ...
Breaking Medicine News(10 mins):
(Date:12/2/2016)... YORK , December 2, 2016 ... the trading session in red, while the Dow Jones Industrial ... at the close of US markets, which prompted Stock-callers this ... stocks: NuVasive Inc. (NASDAQ: NUVA ), Smith & ... (NASDAQ: NXTM ), and Cesca Therapeutics Inc. (NASDAQ: ...
(Date:12/2/2016)... -- Research and Markets has announced the addition ... Technologies, Markets and Companies" to their offering. ... , , ... The market value of drug delivery technologies and the anticancer ... given according to organs involved and the types of cancer as ...
(Date:12/2/2016)... , Dec. 1, 2016  Today, Simpson Healthcare Executives, ... honor of being selected as winners of multiple awards ... Executives Website at the PLATINUM level, Blue Zones Menu ... at the GOLD Level, and our proprietary 3ConneX Platform ... Simpson Healthcare Executives, we are excited to showcase our ...
Breaking Medicine Technology: