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:8/29/2014)... Researchers at UC Davis have made some surprising ... infection. Studying simian immunodeficiency virus (SIV), the team ... Paneth cells are early responders to viral invasion ... producing a cytokine called interleukin-1 beta (IL-1β). ... IL-1β causes breakdown of the gut epithelium that ...
(Date:8/29/2014)... at the Barshop Institute for Longevity and Aging Studies, ... Health Science Center at San Antonio, have found another ... rodent, the naked mole rat. , They reported ... rats protects and alters the activity of the proteasome, ... The factor also protects proteasome function in human, mouse ...
(Date:8/29/2014)... has been known about what genetic changes transform wild ... one of whom is a University of Montana assistant ... controlling the development of the brain and the nervous ... was published Aug. 28 in Science and ... at http://www.sciencemag.org/ ., The domestication of animals and ...
Breaking Biology News(10 mins):The early cost of HIV 2Factor in naked mole rat's cells enhances protein integrity 2New research reveals how wild rabbits were genetically transformed into tame rabbits 2New research reveals how wild rabbits were genetically transformed into tame rabbits 3
(Date:8/29/2014)... Inc. (NYSE MKT: PFNX), a clinical-stage biotechnology company ... to manufacture proteins including biosimilar therapeutics, today provided ... the second quarter ended June 30, 2014. ... public offering, we have the capital to continue ... our proprietary protein expression platform," stated Bertrand C. ...
(Date:8/29/2014)... electrons, but one of the most promising technologies for ... on light (photons) instead of electrons. First, it is ... single photons and control their direction. Researchers around the ... this control, but now scientists at the Niels Bohr ... photons emitted one at a time and in a ...
(Date:8/29/2014)... 29, 2014 The global companion ... in 2019. It is expected to grow at ... and was valued at $1.8 billion in 2013, ... Market Research. , For more information regarding analysis ... , The research report, titled “Companion Diagnostics Market ...
(Date:8/29/2014)... August 29, 2014 According to a new ... the global orthobiologics market was valued at USD 3,754.6 million ... USD 5,519.9million in 2019at a CAGR of 5.9% from 2013 ... years and above is afflicted by bone and joint disorders, ... year 2020. This has and will continue to increase the ...
Breaking Biology Technology:Pfenex Reports Second Quarter 2014 Results and Provides Business Update 2Pfenex Reports Second Quarter 2014 Results and Provides Business Update 3Pfenex Reports Second Quarter 2014 Results and Provides Business Update 4Pfenex Reports Second Quarter 2014 Results and Provides Business Update 5Pfenex Reports Second Quarter 2014 Results and Provides Business Update 6Pfenex Reports Second Quarter 2014 Results and Provides Business Update 7Pfenex Reports Second Quarter 2014 Results and Provides Business Update 8Breakthrough in light sources for new quantum technology 2Companion Diagnostics Market to Hit $5.6 Billion in 2019: Transparency Market Research 2Companion Diagnostics Market to Hit $5.6 Billion in 2019: Transparency Market Research 3Global Orthobiologics Market to Reach $5,519.9 Million by 2019: Transparency Market Research 2Global Orthobiologics Market to Reach $5,519.9 Million by 2019: Transparency Market Research 3
Cached News: