Navigation Links
Mute swan population helps explain longstanding evolutionary question

In an important new study forthcoming from The American Naturalist, biologists from the University of Oxford tracked a colony of mute swans for more than two decades to explore a longstanding evolutionary question: whether the number of eggs laid by a female bird ?known as "clutch size" ?changes in accordance with natural selection.

"Extensive debate in the literature…was first focused on the question: Why does a population's average clutch size differ from the most productive clutch size?" said researcher Ann Charmantier. "Gradually the debate switched to an evolutionary point of view with a second, related question: Why is clutch size not evolving despite significant heritability and directional selection?"

Many long-term studies of avian clutch size have looked for--but not seen-- an increase in the number of eggs laid. However, this 25-year study of the selection, inheritance, and evolution in the mute swan population of Abbotsbury, England, yielded data on clutch size consistent with the direction predicted by evolutionary theory.

"In this study population, clutch size shows a clear response to selection, providing us with a clear illustration of microevolutionary process on a small timescale," explain the researchers.

The researchers hypothesize that a recent relaxation of food constraints and an increase in protection from predators may have helped enable the swans to evolve towards a new, larger clutch size.


'"/>

Source:University of Chicago Press Journals


Page: 1

Related biology news :

1. Measuring the impact of post-genomics on Mediterranean populations
2. A new study examines how shared pathogens affect host populations
3. Are rice and wheat behind Chinas population boom?
4. Ocean climate predicts elk population in Canadian Rockies
5. Environmental lessons from tsunami as worlds coastal population doubles
6. Updated data on novel HPV vaccine confirms efficacy in large population
7. New discovery: Molecular variation in one gene affects the growth of natural populations
8. Treating populations infected with HIV and latent TB could speed the emergence of drug-resistant TB
9. Escapee farmed salmon infiltrate fitter wild populations
10. Efficiency, not more doctors, is the prescription for aging population
11. Alaska seal pup diet may hold key to decline of population
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/14/2016)... , Allemagne, March 14, 2016 ... ) - --> - Renvoi : image ... --> --> ... biométriques, fournit de nouveaux lecteurs d,empreintes digitales pour ... de DERMALOG sera utilisé pour produire des cartes ...
(Date:3/10/2016)... , March 10, 2016 ... market research report "Identity and Access Management Market by ... Compliance, and Governance), by Organization Size, by Deployment, by ... published by MarketsandMarkets, The market is estimated to grow ... Billion by 2020, at a Compound Annual Growth Rate ...
(Date:3/9/2016)... HAMBURG, Germany , March 9, 2016 ... African country,s government identified that more than 23,000 public ... name or had been receiving their salary unlawfully.    ... West African country,s government identified that more than 23,000 ... recorded name or had been receiving their salary unlawfully. ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... ... features a variety of fracture-specific plating options designed to address fractures of the ... fracture fixation solutions. , The Acumed Ankle Plating System 3 is composed of ...
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... Lady had ... she tore her cruciate ligament in her left knee. Lady’s owner Hannah sought the ... central Florida board-certified veterinary surgeon, to repair her cruciate ligament and help with the ...
(Date:5/24/2016)... ... May 24, 2016 , ... ... identity. The new Media Cybernetics corporate branding reflects a results-driven revitalization for a ... image analysis. The re-branding components include a crisp, refreshed logo and a new ...
(Date:5/23/2016)... and LONDON , May 23, 2016 ... Frontage Boost Efficiency by 40% - Frontage Implement a ... Frontage Enforce Quality, Compliance and Traceability Within the Bioanalytical lab ... in the United States and ... be deployed across its laboratory facilities. In addition to serving as ...
Breaking Biology Technology: