Navigation Links
For monogamous sparrows, it doesn't pay to stray (but they do it anyway)
Date:5/22/2012

It's quite common for a female song sparrow to stray from her breeding partner and mate with the male next door, but a new study shows that sleeping around can be costly.

The 20-year study, which is reported in The American Naturalist, found that offspring conceived outside sparrows' social pairs go on to have lower reproductive success than within-pair offspring. The findings throw a monkey wrench into theories about why ostensibly monogamous animals might be inclined to cheat.

Most bird species display some form of monogamy. Bonded pairs stay together for a breeding season, a few seasons, or sometimes for life. But beneath this veneer of monogamy, there's plenty of hanky-panky in most species. Why promiscuity exists in monogamous species is "one of the biggest remaining enigmas in evolutionary ecology," said Jane Reid, a research fellow at the University of Aberdeen and one of the study's authors.

One hypothesis for this is that when a female strays she makes it count by mating with a male of higher genetic quality than her social mate. The result is higher-quality offspring that have a better chance of carrying a female's genes into future generations. This study, however, turns that explanation on its head.

The researchers studied a population of song sparrows in Mandarte Island in British Columbia, Canada. Each year starting in 1993 the team drew small blood samples from nearly every hatchling in the population and used genetic markers to see who fathered each bird. They found that 28 percent of all chicks were fathered by males other than a female's socially paired mate. Thirty-three percent of broods had chicks that were fathered by multiple males.

The researchers tracked both within- and extra-pair offspring throughout their lives. They found that extra-pair offspring had 40 percent fewer offspring of their own, and 30 percent fewer grandoffspring, compared to within-pair offspring.

"These results are remarkable because they are completely opposite to expectation," Reid said. "They show that females suffer a cost of promiscuity because they produce worse offspring through extra pair mating. Rather than answering the question of why females should mate promiscuously, [these results] have blown the question wide open."


'/>"/>

Contact: Kevin Stacey
kstacey@press.uchicago.edu
401-284-3878
University of Chicago Press Journals
Source:Eurekalert

Related medicine news :

1. Young couples cant agree on whether they have agreed to be monogamous
2. Lymph Node Test Doesnt Improve Breast Cancer Care, Study Finds
3. Rabid Stray Dog Spurs Shots for Shelter Workers: Report
4. Stray Breast Tumor Cells in Early Chemo Could Be Bad Sign
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... ... Apple Rehab Shelton Lakes , which specializes in the delivery of ... part of a disaster drill on October 3rd. , Apple Rehab participated with the ... as well as the Connecticut Long Term Care Mutual Aid Plan (LTC-MAP). The ...
(Date:10/13/2017)... Abilene, Texas (PRWEB) , ... October 13, 2017 , ... ... publication this week that explains one of the most popular and least understood books ... seems like cryptic and puzzling descriptions that have baffled scholars for centuries. Many have ...
(Date:10/12/2017)... WILMINGTON, Del. (PRWEB) , ... October 12, 2017 ... ... technology and advisory services for healthcare compliance program management, will showcase a range ... and National Association for Assisted Living (NCAL) Convention and Expo to be held ...
(Date:10/12/2017)... ... 12, 2017 , ... The American College of Medical Informatics (ACMI) will present ... the Opening Session of AMIA’s Annual Symposium in Washington, D.C. AMIA’s Annual Symposium ... Collen, a pioneer in the field of medical informatics, this prestigious award is presented ...
(Date:10/12/2017)... ... ... Leading pediatric oncology experts at Children’s National Health System will join ... International Society of Paediatric Oncology (SIOP) Oct. 12-15. Chaired by Jeffrey Dome, ... at Children’s National, and Stephen P. Hunger, M.D., Chief of the Division of ...
Breaking Medicine News(10 mins):
(Date:9/22/2017)... Sept. 22, 2017 AVACEN Medical (AVACEN) announced ... now successfully helping those with the widespread pain associated ... diagnosed Amanda in Essex, England ... my hair, experiencing no sleep at all, tremendous pain, ... I cannot recommend [the AVACEN 100] enough, how this ...
(Date:9/18/2017)... , Sept. 18, 2017 ... fields of bioinformatics and immune engineering, today ... protective avian influenza A (H7N9) vaccine. ... related to seasonal influenza and presents a ... on prior exposure to be effective. Using ...
(Date:9/12/2017)... Sept. 12, 2017  ValGenesis Inc., the global ... is pleased to announce the appointment of Dr. ... its Board of Directors and Chairman of Advisory ... life science companies to manage their entire validation ... paper in this process. Furthermore, ValGenesis VLMS enables ...
Breaking Medicine Technology: