Navigation Links
Iowa State University researcher's work on gender, temperature link in reptiles published in Nature

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
Iowa State University

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:
(Date:11/25/2015)... ... November 25, 2015 , ... ... Complex (TSC), as well as raising public awareness of the disorder while helping ... a third donation of $35,000 to bolster progress at the Tuberous Sclerosis Complex ...
(Date:11/25/2015)... ... ... Students and parents have something to be thankful for this Thanksgiving week ... California Casualty is proud to support the contest designed to utilize peer-to-peer ... the number one killer of young drivers. , Almost 1,000 entries of original ...
(Date:11/24/2015)... ... November 25, 2015 , ... ... Their Care Plan software creates an agreement between the practice owner and ... including financial, scheduling, monitoring, notification, and projections. Click here to ...
(Date:11/24/2015)... ... ... Dr. Todd S. Afferica, a noted general dentist in Norcross, GA , ... now uses the BIOLASE WaterLase iPlus 2.0™ in many of his dental procedures. This ... cutting tools, such as the scalpel and high-speed drill, which can both cause patients ...
(Date:11/24/2015)... ... ... Young patients with a wide variety of dental needs can now receive ... who are pediatric dentists in Tucson, AZ . Unlike traditional treatment options that ... minimal discomfort and bleeding to the patient during treatment and the following recovery period. ...
Breaking Medicine News(10 mins):
(Date:11/24/2015)... HILL, N.C. , Nov. 24, 2015  In ... research projects in an effort to quickly uncover new ... position. --> --> ... launch a market research project and ensure that all ... company and industry standards. Another major barrier to efficiently ...
(Date:11/24/2015)... Nueva York , 24 de noviembre ... fabricante del Avery Breathing Pacemaker System, se complace ... MD; Ph.D. como consultor clínico. ... --> Foto -   ... doctor Jonzon es un fisiólogo y consultor en ...
(Date:11/24/2015)... Nov. 24, 2015  DILON Diagnostics and GE Healthcare ... agreement for DILON to distribute GE,s Discovery NM750b Molecular ... signing of this distribution agreement will provide Dilon,s experienced ... Imaging system and is considered an initial step in ... solutions for clinicians and their patients. ...
Breaking Medicine Technology: