Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Bizarre bird behavior predicted by game theory

26.02.2009
A team of scientists, led by the University of Exeter, has used game theory to explain the bizarre behaviour of a group of ravens. Juvenile birds from a roost in North Wales have been observed adopting the unusual strategy of foraging for food in 'gangs'.

New research, published in the journal PLoS One (on Wednesday 25 February 2009), explains how this curious behaviour can be predicted by adapting models more commonly used by economists to analyse financial trends.

This is the first time game theory has been used to successfully predict novel animal behaviour in the real world. The researchers believe this analysis could also shed light on the variation in feeding strategies in different populations in other species.

Ravens feed on the carcasses of large animals. Most populations live in temperate forests, where individuals search for carcasses and finds are then defended by a pair of territorial adults. Unpaired younger birds, on the other hand, gather at communal roosts from which they search individually for carcasses on adult territories and recruit each other to overwhelm adult protectionism. However, at one raven roost on Anglesey, things work differently: juveniles forage in gangs. This level of coordination had not been seen before in a raven population.

The researchers built a mathematical model to understand how this behaviour evolved and why it might occur in some roosts and not others. The model designed for this study was based on techniques used in other game theory models, which identify the most profitable behaviours of individuals in different situations to predict what would be favoured by evolution.

The study revealed two strategies as being most profitable for ravens to find food. One is for birds to search independently for food and recruit each other. The other is for the birds to forage in gangs.

The findings showed that gang foraging should occur when searching for food individually is no more efficient than foraging in groups. This is likely to be the case if the roost covers landscape that can be thoroughly explored by a gang over the course of a day. The deforested Welsh countryside offers just such conditions.

The study also identifies the availability of food as a key factor. The roost in Anglesey is situated in an agricultural area, which means that the carcasses of farm animals are often available so food is more plentiful than in wild locations. When food is abundant, the opportunity for social advancement becomes more important. These ravens seem to be using foraging behaviour, not only to find food, but also to gain social status, which could help in other aspects of their lives, including finding a mate.

Lead author Dr Sasha Dall of the University of Exeter said: "This is a rare example of how game theory has been used to predict behaviour in animals in the real world. Our study shows the potential for game theory to help biologists understand how different social structures and behaviours evolve in different environments and in response to human activities."

This study, entitled Rich pickings near large communal roosts favour 'gang' foraging by juvenile common ravens, Corvus corax, was carried out by a team from the University of Exeter's Cornwall Campus and the Institute of Biology, NTNU, Trondheim, Norway.

Sarah Hoyle | EurekAlert!
Further information:
http://www.exeter.ac.uk

More articles from Life Sciences:

nachricht Cancer diagnosis: no more needles?
25.05.2018 | Christian-Albrechts-Universität zu Kiel

nachricht Less is more? Gene switch for healthy aging found
25.05.2018 | Leibniz-Institut für Alternsforschung - Fritz-Lipmann-Institut e.V. (FLI)

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Powerful IT security for the car of the future – research alliance develops new approaches

The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.

Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

In focus: Climate adapted plants

25.05.2018 | Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

 
Latest News

In focus: Climate adapted plants

25.05.2018 | Event News

Flow probes from the 3D printer

25.05.2018 | Machine Engineering

Less is more? Gene switch for healthy aging found

25.05.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>