Navigation Links
Mothers give interloper's offspring a head start in life
Date:5/14/2009

ays, with the order of hatching closely reflecting the order of laying," said Dr Magrath.

"Consequently, extra-pair chicks ended up hatched almost 10 hours before their within-pair half-siblings, on average, allowing them to gain an initial size advantage because parents start feeding chicks as soon as they hatch."

Because of this early advantage, extra-pair chicks were more likely to survive and were also larger than their within-pair half-siblings by the time they left the nest. However, after correcting for variation in hatching time, the researchers found that all differences between extra-pair and within-pair chicks were reduced or absent, indicating that this non-genetic, laying order effect largely accounted for the observed superiority of the extra-pair offspring.

The next challenge for the team is to understand why there is a connection between paternity and the laying order of eggs in the first place.

"Genetic testing now allows us to determine the paternity of individual chicks in mixed broods, but we still don't understand why extra-pair offspring are laid earlier or even why females choose to mate with extra-pair males," said Dr Magrath.

One explanation could be in the timing of copulations. Females may engage in extra-pair matings to guard against the possibility that their social partner is infertile.

"Because females can often store sperm for several weeks, they may typically only copulate with extra-pair males before the start of laying as this may be adequate to fertilise all eggs in the clutch in the event of pair male infertility. However, in the vast majority of cases the pair male is fertile and this scenario could explain why extra-pair offspring become less likely among later laid eggs."

Even if females obtain a mix of sperm before laying, it is possible that the sperm from extra-pair males is more successful in fertilizing eggs if it is of higher quality (e.g. swims faster),
'/>"/>

Contact: Nerissa Hannink
nhannink@unimelb.edu.au
61-383-448-151
University of Melbourne
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Safer, more accurate radiation therapy for expecting mothers
2. Hungry mothers risk addiction in their adult children
3. Negligent, attentive mouse mothers show biological differences
4. Too much or too little weight gain poses risks to pregnant mothers, babies
5. Mice mothers devote energies to offspring when life is threatened
6. Vitamin D deficiency in infants and nursing mothers carries long-term disease risks
7. Mothers pass on disease clues to offspring
8. Facebook flack regarding breastfeeding mothers
9. Older killer whales make the best mothers
10. Mothers of multiple births at increased odds of postpartum depression
11. Species still have more viable offspring if they can choose their best mate
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... Researchers from Salk Institute for Biological Studies, BGI, ... the safety and reliability of the existing targeted ... method, TALEN-HDAdV, which could significantly increased gene-correction efficiency ... study published online in Cell Stell Cell ... cell-based gene therapy. , The combination of stem ...
(Date:7/11/2014)... 11, 2014 The increased risk of kidney injury ... resuscitation fluids reflects the mass of HES molecules, according ... official journal of the International Anesthesia Research Society (IARS). ... harmful effect of HES on cultured human renal proximal ... Christian Wunder and colleagues of University Hospital Wrzburg, Austria. ...
(Date:7/11/2014)... , July 11, 2014 Research ... "International Biometrics Technology Market - Industry Analysis Size ... to their offering. http://photos.prnewswire.com/prnh/20130307/600769 ... and crimes has created a need for high level ... used for personnel authentication such as username and passwords, ...
Breaking Biology News(10 mins):A new genome editing method brings the possibility of gene therapies closer to reality 2In lab studies, hydroxyethyl starch has direct harmful effects on kidney cells 2International Biometrics Technology Market - Industry Analysis Size Share Growth Trends and Forecast to 2019 2
... When students using the Ask a Biologist Web site ask ... actually accessing the combined knowledge of more than 150 volunteer ... "That,s why Dr. Biology is so amazing," says Charles Kazilek, ... on the planet." Kazilek,s site, which attracts 3,000-4,000 visitors ...
... for the Advancement of Science has chosen Arizona State ... science education, to receive the Science Prize ... The prize, established to "encourage innovation and excellence in ... resources by students, teachers, and the public," recognizes the ...
... fish species in the ocean, but the majestic gliding ... astonishing feat of mathematics and energy conservation. In new ... Functional Ecology marine scientists reveal how these ... buoyancy and stay afloat. For most animals movement ...
Cached Biology News:Science selects 'Ask a Biologist' website to win SPORE award 2Science selects 'Ask a Biologist' website to win SPORE award 3Science selects 'Ask a Biologist' website to win SPORE award 4ASU’s Ask A Biologist website wins prestigious SPORE prize 2ASU’s Ask A Biologist website wins prestigious SPORE prize 3Whale sharks do the math to avoid that sinking feeling 2
(Date:7/10/2014)... PETERSBURG, Russia , July 10, 2014 ... Russian Federation Dmitry Medvedev , presented ... biopharmaceutical company BIOCAD . The Company is developing ... scope of MabNext project BIOCAD develops a number of ... cancer and autoimmune diseases. The ceremony took place at ...
(Date:7/10/2014)... 2014   Ceres, Inc . (Nasdaq: ... today financial results for the three months ended May ... Ceres reported that the company and its ... growing season in Brazil, which concluded in June, despite ... evaluation areas for part of the growing season. Yields ...
(Date:7/10/2014)... the journal PNAS (Proceedings of the National Academy ... and sleep deprivation have a significant effect on our ... the best time of day to test for diseases ... medicines effectively. , Researchers from the University of Surrey ... links between sleep deprivation, body clock disruption and metabolism, ...
(Date:7/10/2014)... forever. Nanophysics makes sure of that. Mechanics researchers at Linkping ... Physical Review E . Knowledge that can be of ... be able to sit still forever, and walk around upside ... soon be able to buy smart new fasteners that hold ... is, sooner or later the grip is lost, no matter ...
Breaking Biology Technology:Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2Ceres Announces Fiscal Third Quarter 2014 Financial Results 2Ceres Announces Fiscal Third Quarter 2014 Financial Results 3Ceres Announces Fiscal Third Quarter 2014 Financial Results 4Ceres Announces Fiscal Third Quarter 2014 Financial Results 5Ceres Announces Fiscal Third Quarter 2014 Financial Results 6Ceres Announces Fiscal Third Quarter 2014 Financial Results 7Ceres Announces Fiscal Third Quarter 2014 Financial Results 8Ceres Announces Fiscal Third Quarter 2014 Financial Results 9Time of day crucial to accurately test for diseases, new research finds 2Even geckos can lose their grip 2
... drug discovery and development company eMetagen Corp . ... Marquette University Golden Angels Network , the angel investors ... Golden Angels investment, along with two grants received last ... the National Institutes of Health and a $150,000 Technology ...
... in any foreign land now requires a quick custom check. ... true nationality? What's this nation doing on the global scene ... Do I really like this nation? , ,It's no secret ... savvy than they were a decade ago. They clearly support ...
... - Ann Stunden, director of the Division of ... received a 2005 award for information technology leadership from ... honored Stunden for "strong and ground-breaking leadership in the ... 37 years ago." , ,A co-founder and executive ...
Cached Biology Technology:eMetagen gets $535,000 from MU angel investors 2Why are brands culturally profiled? 2Why are brands culturally profiled? 3
... (bluish-purple), DNA (blue), proteins (red) and acid polysaccharides ... traces: Ca ≤ 10 mg/kg Cd ≤ 5 mg/kg ... ≤ 5 mg/kg Fe ≤ 5 mg/kg K ≤ ... mg/kg Na ≤ 50 mg/kg Ni ≤ 5 mg/kg ...
... performance on minimum space. Thanks to a ... and cooling rates have been achieved that, ... maximum capacity of 48 x 0.2ml tubes, ... much more expensive 96 well instruments. Alternatively, ...
... available in a ready-to-use format. This ... dewaxing paraffin-embedded tissue sections prior to ... other analytical methods. The conventional method ... the slides in a series of ...
EZ-DeWax is a one-step solution that simultanously removes paraffin from and rehydrates formalin-fixed, paraffin embedded tissue...
Biology Products: