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Contact: Jo Bowler
j.bowler@exeter.ac.uk
University of Exeter

Gathering information about food is not top priority for individuals with high metabolisms

Variation in metabolic rates between individuals can explain dramatic differences in information use when it comes to food

New research has revealed that individuals with the highest metabolic rates within populations should be the least pre-occupied with keeping track of changes in their environments that could lead them to sources of food. Individuals with slower or average metabolisms however should be constantly monitoring their opportunities for higher gain when they are looking for food. The study shows that variation in metabolic rates between individuals can explain dramatic differences in information use when it comes to food.

The researchers, from the University of Exeter and the Max Plank Institute for Ornithology, developed a mathematical model to determine how metabolic rate - of the range present in many animals, including humans - influences the way in which individuals use information when foraging.

Commonly thought to be associated with weight gain, a low metabolic rate refers to the relatively small amount of energy required for an individual's major organs to function compared to an individual with a high metabolic rate.

The model assumed that if energy reserves drop to a critical level then the individual would die from starvation and it required individuals to accrue sufficient reserves to survive overnight.

The results can be used to predict how differences in metabolic rate dictate the way that individuals accumulate energy reserves. The results also show how differences in metabolic rate influence the way that individuals exploit resources that need to be tracked to be efficiently used.

Dr Sasha Dall from the University of Exeter said: "Our model shows that metabolic rate strongly influences an individual's willingness to use information while searching for food. There is a cost associated with gathering information and we have found that individuals with high metabolic rates don't value this information enough to pay the costs of obtaining it - even if it makes them better at finding food. Individuals with lower metabolic rates however value information enough to use it extensively."

Dr Kimberley Mathot from the Max Plank Institute for Ornithology said: "This study suggests that it is not worthwhile for individuals with high metabolic rates, and so high energy requirements, to make the costly errors that would be inevitable if they were to try to learn about the best foraging options. Individuals with low metabolic rates, and lower overall energy requirements, have less to lose and so can explore multiple options that may result in them finding productive sources of food."

The research suggests that individuals with low or moderate metabolic rates, who regularly gather information on acquiring energy reserves, may be in a better position to exploit the best foraging opportunities when they arise compared to those individuals with high metabolic rates who have not invested in information. This makes individuals with low metabolic rates better at dealing with food shortages.

The study highlights how differences in energy use by the body can strongly influence individual behavioural tendencies and decision making. Future work will investigate whether variation in metabolic rates can be used to predict behavioural differences in other contexts.

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The research is published in the American Naturalist and is available online: http://www.jstor.org/stable/10.1086/673300

About the University of Exeter

The Sunday Times University of the Year 2012-13, the University of Exeter is a Russell Group university and in the top one percent of institutions globally. It combines world-class research with very high levels of student satisfaction. Exeter has over 18,000 students and is ranked 8th in The Times and The Sunday Times Good University Guide league table, 10th in The Complete University Guide and 12th in the Guardian University Guide 2014. In the 2008 Research Assessment Exercise (RAE) 90% of the University's research was rated as being at internationally recognised levels and 16 of its 31 subjects are ranked in the top 10, with 27 subjects ranked in the top 20.

The University has four campuses. The Streatham and St Luke's campuses are in Exeter and there are two campuses in Cornwall, Penryn and Truro. In an arrangement that is unique in the UK, the Penryn Campus is owned and jointly managed with Falmouth University. At the campus, University of Exeter students can study programmes in the following areas: Animal Behaviour, Conservation Biology and Ecology, English, Environmental Sciences, Evolutionary Biology, Geography, Geology, History, Human Sciences, Mathematics and the Environment, Mining and Minerals Engineering, Politics and International

Studies, Renewable Energy and Zoology. The University has invested strategically to deliver more than 350 million worth of new facilities across its campuses in the past few years; including landmark new student services centres - the Forum in Exeter and The Exchange at Penryn together with world-class new facilities for Biosciences, the Business School and the Environment and Sustainability Institute. There are plans for another 330 million of investment between now and 2016. http://www.exeter.ac.uk/cornwall

For further information:

Dr Jo Bowler
University of Exeter Press Office
Office: +44 (0)1392 722062
Mobile: +44(0)7827 309 332
Twitter: @UoE_ScienceNews
j.bowler@exeter.ac.uk



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