HOME >> BIOLOGY >> NEWS
High Testosterone Level May Lead Male Junco To Stray From Mate

COLUMBUS, Ohio -- What makes a normally monogamous male bird stray from his mate to copulate with neighboring females?

High levels of testosterone may be part of the answer, according to a new study. Researchers found that male dark-eyed juncos that were given extra testosterone during the breeding season were more likely than normal males to fertilize females other than their mates.

The junco’s family at the home nest paid the price for these sexual encounters. Results showed that high-testosterone male juncos spent less time providing care for young in their own nests. Researchers suspect this is why high-testosterone males, when compared to normal males, produced fewer offspring with their own mates but more offspring with the mates of their neighbors.

The study was conducted by Samrrah Raouf, a graduate student, and biologists Ellen Ketterson and Val Nolan, the project’s directors, all of Indiana University. They collaborated with Patricia Parker, associate professor of zoology at Ohio State University, who is an expert in mating systems of birds and in determining parentage; and Charles Ziegenfus of James Madison University, who has studied juncos for many years. Their findings were published in a recent issue of the Proceedings of the Royal Society of London Series B - Biological Sciences.

“Researchers all over the world are using new genetic tools like DNA fingerprinting to understand animal mating behavior,” Parker said.

“In many cases, the results reveal that clandestine matings are taking place, but we often know little about the conditions under which they take place, or the costs and benefits of different mating tactics,” Parker explained.

“This study suggests testosterone plays an important role in determining how often males wander from their home nests to fertilize other females,
'"/>

Contact: Patricia Parker
Parker.3@osu.edu
(614) 292-0378
Ohio State University
10-Feb-1998


Page: 1 2 3 4

Related biology news :

1. Testosterone levels and marriage: High is not all bad
2. Testosterone gel (AndroGel) study demonstrates safety and efficacy up to 42 months
3. Testosterone dose-repsonse relationships in healthy young men
4. Testosterone, stress may not suppress immune system after all
5. Plant-Based Fat May Reduce Risk Of Prostate Cancer By Altering Testosterone Metabolism, UB Study Shows
6. Stress Lowers Sperm Count By Overwhelming Cells That Make Testosterone
7. Testosterone And Working Memory; Epilepsy And Schizophrenia; Toxins And Neuron Death; Oregon Researchers Present Findings At Society For Neuroscience
8. The Reason The French Have Low Levels Of Heart Disease
9. Marine Life In South Pacific Region Found To Be Impervious To Oceans Highest Arsenic Levels
10. Breast Milk Of Women Who Eat Lake Ontario Fish Contains High Levels Of PCBs, UB Study Finds
11. For First Time In 40 Years National Jewish Researchers Report Chronic Beryllium Disease Caused By Extremely Low Levels Of Exposure

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: High Testosterone Level May Lead Male Junco Stray From Mate

(Date:10/17/2014)... Copenhagen have shown for the first time how bacteria ... patients, giving them the opportunity to get tremendous insights ... The study also discovered the bacterial growth in chronic ... or slowed down by the immune cells. The researchers ... helped "suffocate" the bacteria, forcing the bacteria to switch ...
(Date:10/16/2014)... conventional thinking on how the bowel lining develops and, ... bowel cancer starts. , The researchers produced evidence that ... ,crypts, that are a feature of the bowel lining, ... cancer development, a controversial finding as scientists are still ... imaging technologies, Dr Chin Wee Tan and Professor Tony ...
(Date:10/15/2014)... N.Y. , Oct. 15, 2014 ... solutions for home and community-based care, today announced ... of implementing Sandata,s Santrax® Electronic Visit Verification™ Solution ... Services is a home health company founded in ... Texas . The study ...
Breaking Biology News(10 mins):Scientists opens black box on bacterial growth in cystic fibrosis lung infection 2Cryptic clues drive new theory of bowel cancer development 2Sandata Announces Case Study with Quality Care Services, Inc. 2
(Date:10/25/2014)... , October 24, 2014 ... Markets ( http://www.researchandmarkets.com/research/t5t5pd/the_global_market ) has announced the addition ... Nanotubes, Graphene And Other 2-D Nanomaterials " ... (Logo: http://photos.prnewswire.com/prnh/20130307/600769) , ,CNTs and graphene are ... known to man, with a performance-per-weight greater ...
(Date:10/22/2014)... 21, 2014 The North American crystal ... North America with analysis and forecast of revenue. This ... is expected to reach $623.6 million by 2018, at ... Browse through the TOC of the North American crystal ... in-depth analysis provided. This also provides a glimpse of ...
(Date:10/22/2014)... Khaimah, UAE (PRWEB) October 22, 2014 ... life science and healthcare projects, announces the addition of ... DRCOG DCH to its advisory team. Dr. Siddiqui will ... team. , A graduate of University College ... was subsequently degreed in medicine in 2001. With further ...
(Date:10/22/2014)... 22, 2014 Nuvilex, Inc. (OTCQB: NVLX) – ... people worldwide are living with diabetes, with  that number ... The global market for diabetes treatments is approximately $500 ... worldwide died from pancreatic cancer.  Pancreatic cancer is the ... in the United States , and ...
Breaking Biology Technology:The Global Market for Carbon Nanotubes, Graphene and Other 2-D Nanomaterials 2The Global Market for Carbon Nanotubes, Graphene and Other 2-D Nanomaterials 3The Global Market for Carbon Nanotubes, Graphene and Other 2-D Nanomaterials 4The North American crystal oscillator market is expected to reach $623.6 million by 2018 - New Report by MicroMarket Monitor 2The North American crystal oscillator market is expected to reach $623.6 million by 2018 - New Report by MicroMarket Monitor 3The North American crystal oscillator market is expected to reach $623.6 million by 2018 - New Report by MicroMarket Monitor 4Dr. Yousef Siddiqui joins the Grace Century Advisory Team 2Nuvilex Brief Analyst Report: Thinking Outside the Box by BrokerBank Securities, Inc. 2
Cached News: