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:2/12/2016)... ... ... The law firm of Morrow, Morrow, Ryan & Bassett is offering scholarships ... is to encourage applicants to pursue a degree in their field of study and ... , “We have available jobs in St. Landry and Evangeline Parishes that can be ...
(Date:2/12/2016)... ... ... Each year, the American Physical Therapy Association (APTA) offers a Combined Sections Meeting. ... Almost 10,000 physical therapists across the country are expected to attend this annual convention ... field and network with their colleagues. As in years past, HydroWorx is proud ...
(Date:2/12/2016)... ... February 12, 2016 , ... Itopia, a leader in cloud ... Clarity Intelligence Platform (CIP) into Cielo®, a discovery, migration and cloud orchestration engine. ... their small and medium business (SMB) clients. , In recent years, ...
(Date:2/12/2016)... ... ... Vail knee specialist Robert LaPrade, MD, PhD was named one ... consists of physicians establishing, leading and partnering with ambulatory surgery centers across the United ... Center, also known as an ASC, is a modern health care facility focused on ...
(Date:2/12/2016)... ... ... For Coast Dental dentist Everet Lake, DDS, the smiles began at dawn. He ... 7 a.m. to volunteer at Friday’s Dentistry from the Heart event in New Port ... hundreds of uninsured and underinsured people receive much-needed dental care. , This was ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... Feb. 11, 2016  NOIT™ Research LLC, a private, ... of Change" campaign to assist needy families in obtaining ... unit sold between February 10, 2016 and March 31, ... needy family. The NOIT is an auditory stimulus that ... develop language skills. Beth Shier , ...
(Date:2/11/2016)... , Feb. 11, 2016 AAIPharma ... provider of custom manufacturing and development services for ... sterile fill-finish capabilities and capacity in its ... in demand has driven several recent investments. ... it had one filling line with small-scale lyophilization. ...
(Date:2/11/2016)... PORTLAND, Ore. , Feb. 11, 2016 ... to announce the acquisition of SolutionsRx, a full-service 340B ... hospitals. Along with providing traditional contract pharmacy services, SolutionsRx ... assist clients in navigating the complex 340B regulatory environment. ... Wellpartner. --> James R. Love , CEO ...
Breaking Medicine Technology: