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)... ... October 13, 2017 , ... The ... to promote standards of excellence for the field of eating disorders, announces the ... – 25, 2018 in Orlando, Florida at the Omni Resort at ChampionsGate. ...
(Date:10/13/2017)... ... October 13, 2017 , ... Many families have long-term insurance that covers ... companies have a waiver for care if the client has a cognitive impairment diagnosis. ... pays for care, is often waived, so the benefits from their insurance start immediately,” ...
(Date:10/13/2017)... ... October 13, 2017 , ... ... giving viewers the lowdown on sciatica in a new episode of "Success Files," ... on current events and innovation and investigates each subject in-depth with passion and ...
(Date:10/12/2017)... CA (PRWEB) , ... October 12, 2017 , ... ... Cheng, are now treating sleep apnea using cutting-edge Oventus O2Vent technology. ... a serious sleep disorder characterized by frequent cessation in breathing. Oral appliances can ...
(Date:10/12/2017)... ... October 12, 2017 , ... Asante, a nationally recognized ... have expanded their existing home health joint venture through an agreement, effective October ... a joint venture home health company with Asante, delivering clinically integrated care, for ...
Breaking Medicine News(10 mins):
(Date:10/2/2017)... Halo Labs announces the European launch of their new ... at MIBio 2017 in Cambridge, U.K on ... in biopharmaceutical samples with unprecedented speed and sensitivity while using far ... Membrane Imaging. ... particle analysis system ...
(Date:9/28/2017)... Cohen Veterans Bioscience and Early Signal Foundation announce a ... sensors for real-time monitoring of patients with trauma-related and ... focused on disruptive health solutions for rare disorders and ... record and integrate behavioral, cognitive, physiological and contextual data. ... ...
(Date:9/25/2017)... , Sept. 25, 2017   Montrium ... Master File solutions, today—from the IQPC Trial Master ... , NL)—announced that EastHORN Clinical Services has ... clinical programs and TMF management. EastHORN, a leading ... eTMF platform to increase transparency to enable greater ...
Breaking Medicine Technology: