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 re
'/>"/>

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

Page: 1 2

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:8/30/2014)... Atlanta, GA (PRWEB) August 30, 2014 ... US Open Challenge and K.Warrior Search on November 8th, ... Over 20 years, these events have introduced many notorious ... such as Strike-Force, IWF and the UFC. , ... seen numerous fighters leave its doors armed with the ...
(Date:8/30/2014)... 30 August 2014: The first multidisciplinary recommendations on ... coronary syndromes (ACS) are published today in ... written jointly by the European Heart Rhythm Association ... the European Association of Percutaneous Cardiovascular Interventions (EAPCI), ... Gorenek (Turkey), chairperson of the task force, said: ...
(Date:8/30/2014)... Saturday 30 August 2014: The first recommendations on ... pulmonary embolism are published today in new ESC ... by Professor Stavros V. Konstantinides (Germany/Greece) and Professor ... on the diagnosis and management of acute pulmonary ... Journal (1) and on the ESC Website. , ...
(Date:8/29/2014)... Daily Gossip writes in its review that this is ... This method promises to teach readers how to eliminate the ... alternative sources for the production of energy. , Some ... solar power. , The Home Made Energy review indicates ... So, this is an online guide that will teach its ...
(Date:8/29/2014)... (PRWEB) August 30, 2014 Cancer ... loved ones and caretakers. Author Eddie M. Leung knows the ... cholangiocarcinoma or bile duct cancer, a very rare and ... That Changed My Life” (published by Xlibris), he shares a ... importantly, he imparts a survivor’s testimony that this disease can ...
Breaking Medicine News(10 mins):Health News:KSF Presents US Open Challenge-K. Warrior Search, Seeking Inspirational Warrior Fighters Like Cung Le 2Health News:KSF Presents US Open Challenge-K. Warrior Search, Seeking Inspirational Warrior Fighters Like Cung Le 3Health News:KSF Presents US Open Challenge-K. Warrior Search, Seeking Inspirational Warrior Fighters Like Cung Le 4Health News:First multidisciplinary recommendations on management of arrhythmias in ACS patients 2Health News:First recommendations on all new oral anticoagulants in pulmonary embolism published 2Health News:Home Made Energy Review Exposes Simple Method to Access Alternative Energy Sources 2Health News:Eddie M. Leung Shares His Testimony As a Survivor of Cancer 2Health News:Eddie M. Leung Shares His Testimony As a Survivor of Cancer 3
... may not be at,the top of your list of fun ... makes having any kind of fun a lot harder in ... your fiber intake, while enjoying the,benefits of regularity., Listen ... http://media.medialink.com/WebNR.aspx?story=35262 ., Registered journalists can access video, audio, text, ...
... Ind., June 19 Zimmer Holdings, Inc.,(NYSE: ... that it will partner with AmeriCares,one of ... donations, to support emergency response and ongoing ... at $1 million to,three of AmeriCares, primary ...
... a major international clinical trial coordinated by the Montreal ... England Journal of Medicine . The Atrial Fibrillation and ... project involving patients with heart failure and atrial fibrillation. ... the population and associated atrial fibrillation (a very common ...
... for diarrhea worldwide, study says , , THURSDAY, June 19 (HealthDay ... may help dysentery-causing amoeba evade the immune system. , ... fight dysentery, a form of diarrhea that affects about 500 ... threat in many regions. , "This is the first ...
... June 19 NightHawk,Radiology Holdings, Inc. (Nasdaq: NHWK ... and hospitals throughout the United States,today announced the final ... at 5:00 p.m. Eastern Time on Friday, June 13, ... depositary for the tender offer, an,aggregate of 2,240,883 shares ...
... June 19 Minneapolis-based Courage Center,is pleased to announce ... 2008,Eleven Who Care Agency of Distinction., Over the ... has,recognized the outstanding efforts of 264 (275 including 2008) ... amazing. Since the,awards began, 12 Courage Center volunteers (including ...
Cached Medicine News:Health News:Zimmer Holdings to Partner with AmeriCares for Global Product Donation Program 2Health News:Zimmer Holdings to Partner with AmeriCares for Global Product Donation Program 3Health News:The Montreal Heart Institute presents findings on congestive heart failure and atrial fibrillation 2Health News:The Montreal Heart Institute presents findings on congestive heart failure and atrial fibrillation 3Health News:Scientists ID Enzyme That Allows Dysentery Amoeba to Hide 2Health News:NightHawk Radiology Holdings, Inc. Announces Final Results of Tender Offer; NightHawk Purchases 2,240,883 Shares of Its Common Stock at $8.05 per Share 2Health News:Courage Center Honored With KARE TV's 2008 Eleven Who Care Agency of Distinction 2
(Date:8/29/2014)... 29, 2014 Research and Markets ... Cancer Therapeutics Market & Pipeline Insight 2014" report ... developed to prevent and eradicate the prevalence of cancer ... are confined to low specificity, safety and large number ... for a better solution. It has been discovered that ...
(Date:8/29/2014)... SPRING, Md. , Aug. 29, 2014  United ... that the U.S. District Court for the District of ... its favor in the company,s case against Sandoz, Inc. ... Judge Peter Sheridan ruled that U.S. Patent ... Inc., and enjoined Sandoz from marketing its generic product ...
(Date:8/29/2014)... Aug. 29, 2014 /PRNewswire-iReach/ -- ChemImage will present a ... and New Zealand Forensic Science Society,s 22 nd ... Adelaide, Australia .  Forensic Scientists ... advancements that hyperspectral imaging can bring to examination ... , Director of Product Development at ChemImage, will ...
Breaking Medicine Technology:Global Peptide Cancer Therapeutics Market & Pipeline Insight 2014 2District Court Decision Received In Remodulin Patent Case 2ChemImage to Discuss Hyperspectral Imaging for Forensic Investigation at the ANZFSS 22nd International Symposium on the Forensic Sciences 2ChemImage to Discuss Hyperspectral Imaging for Forensic Investigation at the ANZFSS 22nd International Symposium on the Forensic Sciences 3
... with brass and aluminum body., ... suffix S to model number. Example: ... suffix C to model number. Example: ... Power Take-Off, add PT to model ...
... FM Series Oxygen Flowmeters with Power ... security chain, add suffix S to ... Canadian Color-Code, add suffix C to ... Double Flowmeters with Power Take-Off, add ...
... proficiency testing solutions with outstanding customer service ... is one of the largest proficiency testing ... laboratories enrolled. Here are just some of ... Paperless Proficiency Testing, Free CME/CMLE Credits ...
... a new functional test which exhibits 100% ... C Resistance caused by the Factor V ... commercially available methods, Pefakit APC-R FVL shows ... Lupus Anticoagulants, Elevated FVIII levels, Heparins or ...
Medicine Products: