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:6/17/2015)... JOSE, Calif. , June 17, 2015 /PRNewswire/ ... in human interface solutions, today announced that Xiaomi, ... adopted the Synaptics ® ClearPad ® ... of display driver integrated circuits (DDICs) for its ... Pro. By leveraging ClearPad for full in-cell display ...
(Date:6/16/2015)... NEW YORK , June 16, 2015  With ... the world, security remains a top concern. The recent ... confirms the need for strong authentication within government ... HYPR Token, a biometric one-time password (OTP) authenticator, has ... Processing Standards (FIPS) 140-2 Level 3 validation for tamper ...
(Date:6/15/2015)... DALLAS , June 16, 2015 ... Language Processing Market by Type (Rule-Based, Statistical, and Hybrid), ... Worldwide Forecast to 2020" published by MarketsandMarkets, The Natural ... Billion at a CAGR of 18.4% for the forecast ... Tables and   46 F igures spread   ...
Breaking Biology News(10 mins):Synaptics Touchscreen and Display Driver IC Solutions Power Xiaomi's Latest Flagship Smartphones 2Synaptics Touchscreen and Display Driver IC Solutions Power Xiaomi's Latest Flagship Smartphones 3Government Ready Biometric Security Approaching as HYPR Corp. Files FIPS 140-2 Level 3 Validation for Its Proprietary Biometric Token 2Government Ready Biometric Security Approaching as HYPR Corp. Files FIPS 140-2 Level 3 Validation for Its Proprietary Biometric Token 3Natural Language Processing Market Worth $13.4 Billion by 2020 2Natural Language Processing Market Worth $13.4 Billion by 2020 3Natural Language Processing Market Worth $13.4 Billion by 2020 4Natural Language Processing Market Worth $13.4 Billion by 2020 5
... Cruz Mountains two closely related species of mice share a ... lives. The California mouse ( Peromyscus californicus ) is characterized ... maniculatus ) is sexually promiscuous. Researchers at the University ... behavior impact the bacteria hosted by each species as well ...
... trials can be time-consuming, expensive and intrusive, but they ... Space Institute in Tullahoma have developed an invention that ... the virtual world. Called "digital Eye Bank," the ... eyes for researchers to use when testing their inventions. ...
... federal research effort to evaluate freshwater sustainability across the ... can be done to make the best use of ... the effects of climate change over the next 10 ... of Georgia are also part of the project. ...
Cached Biology News:Monogamy and the immune system 2Monogamy and the immune system 3Monogamy and the immune system 4Monogamy and the immune system 5University of Tennessee Space Institute researchers make clinical trials a virtual reality 2NC State leads national effort to evaluate fresh water sustainability in the southern US 2
(Date:7/1/2015)... ... July 01, 2015 , ... ... pathogen transmission. CTI’ new Medical Joysticks have an impermeable molecular barrier protection ... an operator control device that will increase healthcare worker safety and reduce financial ...
(Date:6/30/2015)... , ... June 30, 2015 , ... ... hosting a webinar to provide advanced scientific research into new classes of Nanoscale ... and energy. Touted as 'the wonder material of the 21st Century' by ...
(Date:6/30/2015)... ... June 30, 2015 , ... With its latest ... selectivity to achieve faster flow rates in comparison to nylon or polyethersulfone (PES). ... space to allow easy liquid flow while trapping particulates as small as 0.2 ...
(Date:6/30/2015)... N.Y. , June 30, 2015  Custom Computer ... announced today that they are silver sponsors of the ... official PCDC sponsor, Custom is lending their support of ... low-income communities. Since its founding in 1993, ... the primary care area.  PCDC has financed over 100 ...
Breaking Biology Technology:Sanitized Medical Joysticks for a Safer and Healthier Work Environment 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 3How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 4New Nanofiber Membrane Provides Fast, Efficient Filtration 2Custom Computer Specialists Announces Sponsorship Of The Primary Care Development Corporation's Corporate Circle 2
... Arbor, MI.-The University of Michigan's Business School may have ... for growing technology firms in Wisconsin and the rest ... Growth Capital Symposium began at the University of Michigan ... from across the country. , ,Allan Dines, Assistant ...
... TriMas Corporation, a growth company ... that its Cequent Transportation Accessories ... a provider of zinc plating ... Schofield, Wis. and has been ...
... by a University of Wisconsin-Madison Engineering professor could help ... devices as laptop computers and provide insights into utilizing ... device will allow researchers to study for the first ... single electron transport in transistors. , ...
Cached Biology Technology:Michigan Growth Capital Symposium includes Wisconsin Tech Companies 2Cool Computers 2Cool Computers 3
... fragment is a proteolytic product ... DNA Polymerase I which retains ... exonuclease activity, but has lost ... retains the polymerization fidelity of ...
... RNase H degrades, as an endoribonuclease, ... DNA hybrids of natural origin, e.g. ... synthetic complexes, e.g. poly(A) x poly(dT). ... and 3-OH termini. Nearly no activity ...
... containing an overproducing clone of T4 DNA Ligase. ... a phosphodiester bond between juxtaposed 5' phosphoryl ... It repairs single-stranded nicks in duplex DNA, RNA ... and cohesive-end fragments of duplex DNA or RNA ...
Goat polyclonal to Haptoglobin ( Abpromise for all tested applications). Antigen: Affinity purified human haptoglobin. Entrez GeneID: 3240 Swiss Protein ID: P00738...
Biology Products: