Navigation Links
Fight or flight? Vocal cues help deer decide during mating season

Previous studies have shown that male fallow deer, known as bucks, can call for a mate more than 3000 times per hour during the rut (peak of the mating season), and their efforts in calling, fighting and mating can leave them sounding hoarse.

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.

"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.

"Until recently we have known relatively little about who is listening to their calling, and what information they are hearing," commented Dr Alan McElligott, also from Queen Mary's School of Biological and Chemical Sciences.

The scientists played slow and fast rate groaning sounds, as well as groans from early in the rut, and ones from late in the rut (when bucks are tired), to mature male deer in Petworth Park, West Sussex during the peak of the mating season. The speakers were hidden from view and scientists measured how long it took for the deer to react to the calls, as well as their orientation, posture, and calls they made in response.

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."

Contact: Neha Okhandiar
Queen Mary, University of London

Related biology news :

1. How a shape-shifting DNA-repair machine fights cancer
2. Secrets of potato blight evolution could help farmers fight back
3. Does it pay to be a lover or a fighter? It depends on how you woo females
4. Ph.D. students in India, Ethiopia and Kenya to fight wheat stripe rust
5. Fighting flies
6. New strategy emerges for fighting drug-resistant malaria
7. Research uncovers key difference between our bodies fight against viruses and bacteria
8. Marine bacteria to fight tough infections
9. Tiny acts of microbe justice help reveal how nature fights freeloaders
10. Study explaining parasite gene expression could help fight toxoplasmosis and malaria
11. Plant used in Chinese medicine fights chronic pain
Post Your Comments:
Related Image:
Fight or flight? Vocal cues help deer decide during mating season
(Date:11/17/2015)... Pressure BioSciences, Inc. (OTCQB: PBIO) ("PBI" and ... of broadly enabling, pressure cycling technology ("PCT")-based sample preparation ... it has received gross proceeds of $745,000 from an ... "Offering"), increasing the total amount raised to date in ... are expected in the near future. ...
(Date:11/12/2015)... BOSTON , Nov. 12, 2015  A golden ... for Duchenne muscular dystrophy (DMD) has provided a new ... Boston Children,s Hospital, the Broad Institute of MIT and ... Brazil . Cell, ... some dogs "escape" the disease,s effects. The Boston Children,s ...
(Date:11/12/2015)... 2015   Growing need for low-cost, easy ... been paving the way for use of biochemical ... analytes in clinical, agricultural, environmental, food and defense ... in medical applications, however, their adoption is increasing ... continuous emphasis on improving product quality and growing ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... CA (PRWEB) , ... November 25, 2015 , ... ... genomics company uBiome, were featured on AngelList early in their initial angel funding ... an AngelList syndicate for individuals looking to make early stage investments in the ...
(Date:11/24/2015)... 2015 /CNW/ - iCo Therapeutics ("iCo" or "the Company") ... for the quarter ended September 30, 2015. Amounts, ... and presented under International Financial Reporting Standards ("IFRS"). ... said Andrew Rae , President & CEO ... not only value enriching for this clinical program, ...
(Date:11/24/2015)... -- --> --> ... Market by Product & Services (Primer, Probe, Custom Oligos, ... End-User (Research, Pharmaceutical & Biotech, Diagnostic Labs) - Global ... expected to reach USD 1,918.6 Million by 2020 from ... 10.1% during the forecast period. Browse 183 ...
(Date:11/24/2015)... Ltd. (OTCQB: TIKRF) today announced that its Annual General Meeting of Shareholders ... Israel time, at the law offices of Goldfarb Seligman ... Floor, Tel Aviv, Israel . ... to the Board of Directors; , election of Liat ... an amendment to certain terms of options granted to our Chief Executive ...
Breaking Biology Technology: