In this new study, published today (10 February) in the journal Behavioral Ecology, scientists were able to gauge that fallow bucks listen to the sound quality of rival males' calls and evaluate how exhausted the caller is and whether they should fight or keep their distance.
Male fallow deer are sensitive to changes in the groans that rivals make during mating season when competing for the attention of female deer and can assess the level of threat other males pose simply from vocal cues, according to new research from Queen Mary University of London.
Credit: Queen Mary University of London
"Fallow bucks are among the most impressive vocal athletes of all deer and invest a large amount of time and energy in calling," explained Dr Benjamin Pitcher from Queen Mary's School of Biological and Chemical Sciences.
During the mating season, fallow bucks produce a call or groan, both to attract mates, and repel competing males. Groans contain numerous clues about each animal, such as their size and status in the herd. The researchers set up a series of playback experiments to investigate how the bucks responded to changes in calling rates and vocal fatigue in the groans of their rivals.
The deer were more responsive to fast rate groans than to slow rate groans indicating that bucks signal their motivation or aggressiveness in how quickly they call. The bucks also recognised groans from early in the rut, recorded before callers became tired, as more threatening than groans recorded later in the rut. This shows that bucks can detect when rivals are becoming fatigued and that exhausted males pose less of a threat.
Dr Pitcher added: "We know from this recent study that by detecting changes in calls, bucks are able to judge which rival is most vulnerable to be challenged and when to fight."
It's known that male deer largely stop feeding and lose more than a quarter* of their body weight while they focus on finding mates, so vocal fatigue seems to be an important indicator as to which male deer have become worn out over the course of the breeding season.
"These results help us to understand how vocalisations and behaviours associated with mating have evolved," said Dr McElligott.
"The findings demonstrate how sexual selection has shaped the vocal behaviour and communication system of fallow deer. We see this trend with other mammals that have similar vocal systems, such as sea lions. The study helps to develop an understanding of how competing for, and attracting mates, has influenced the evolution of communication systems, including human speech."
The work was done in collaboration with the University of Zurich and ETH Zurich, and funded by The Fyssen Foundation.
*Male fallow deer lose approximately 26 per cent of their body weight during the height of the mating season.
The research also involved Dr Elodie Briefer who is now based at ETH Zurich and Dr Elisabetta Vannoni at University of Zurich.
'Fallow bucks attend to vocal cues of motivation and fatigue' is published in the journal Behavioral Ecology on Monday 10 February 2014.
For more information or to arrange interviews with the authors, please contact:Neha Okhandiar
A member of the Russell Group, it is amongst the largest of the colleges of the University of London. Queen Mary's 4,000staff deliver world class degree programmes and research across 21 academic departments and institutes, within three Faculties: Science and Engineering; Humanities and Social Sciences; and the School of Medicine and Dentistry.
Queen Mary is ranked 11th in the UK according to the Guardian analysis of the 2008 Research Assessment Exercise, and has been described as 'the biggest star among the research-intensive institutions' by the Times Higher Education.
The College has a strong international reputation, with around 20 per cent of students coming from over 100 countries. Queen Mary has an annual turnover of £300m, research income worth £90m, and generates employment and output worth £600m to the UK economy each year.
The College is unique amongst London's universities in being able to offer a completely integrated residential campus, with a 2,000-bed award-winning Student Village on its Mile End campus.
Neha Okhandiar | EurekAlert!
Safeguarding sustainability through forest certification mapping
27.06.2017 | International Institute for Applied Systems Analysis (IIASA)
Dune ecosystem modelling
26.06.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
21.07.2017 | Earth Sciences
21.07.2017 | Power and Electrical Engineering
21.07.2017 | Physics and Astronomy