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:1/20/2017)... ... 2017 , ... “Code Word: Chocolate Biscuit”: a biographical account following a man who went on ... of published author, Marlyn Ivey, born in Lynn Haven, Florida and at the age of ... 19 years of age, he joined the Navy and got married right out of boot ...
(Date:1/20/2017)... ... 20, 2017 , ... D R Burton Healthcare Products LLC, ... featured in a study indicating superior performance against competitive products in secretion clearance. ... Oscillating Positive Expiratory Pressure Devices During Simulated Breathing“ was published in the winter ...
(Date:1/20/2017)... ... ... enchanting tale that teaches children the true meaning of Christmas. “Journey to Christmas” is the ... devoted woman of faith. , “Becoming a parent changes you. In my case, the ... years, but actually doing it might have been a while in coming if it hadn’t ...
(Date:1/20/2017)... ... , ... “The Land of More and More”: a brilliant story for ... shares the simple and achievable answer. “The Land of More and More” is the ... Church in Angola, Indiana where he works with the children’s ministry department. , ...
(Date:1/19/2017)... ... 2017 , ... Today, the Centers for Medicare & Medicaid Services (CMS) announced ... Models (APMs) in 2017. Clinicians who participate in APMs are paid for the quality ... the Administration’s effort to build a system that delivers better care and one in ...
Breaking Medicine News(10 mins):
(Date:1/20/2017)... Research and Markets has announced the addition of the ... Amplifiers, Diagnostic Instruments), Sales Volume, Company Analysis and Forecast to ... ... Volume, Company Analysis and Forecast to 2022 provides a comprehensive ... The growing prevalence of hearing impairment coupled with an expanding ...
(Date:1/20/2017)... , Jan. 20, 2017  Palladian Health, ... has announced the launch of an opioid management ... guidelines on opioids and helps stem the growing ... often prescribed to treat chronic non-cancer pain (back ... serious risks and lack of evidence regarding long-term ...
(Date:1/19/2017)... 2017 Germany Cataract Surgery ... new report, "Germany Cataract Surgery Devices Market Outlook to ... Surgery Devices market. The report provides value, in millions ... (USD) within market segements - Phacoemulsification Equipment and Ophthalmic ... shares and distribution shares data for each of these ...
Breaking Medicine Technology: