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Male Reindeer Inflate Their Air Sac To Make Sexually Enticing Hoarse Rutting Calls

Date:
March 12, 2007
Source:
Blackwell Publishing Ltd.
Summary:
A group of European scientists have determined that a male reindeer's air sac, influencing vocal sound and neck contour, may contribute to his sexual prowess and reproductive success. The results of this research have recently been published in Journal of Anatomy.

A group of European scientists have determined that a male reindeer's air sac, influencing vocal sound and neck contour, may contribute to his sexual prowess and reproductive success. The results of this research have recently been published in Journal of Anatomy.

As in other species with harem-like mating systems, the voice organs of reindeer differ according to gender. Adult males have a much larger air sac than females and the young.

In early life, growth of the air sac seems to be comparable in male and female reindeer until they reach the age of two--three years, at which point the female's air sac stops growing, whilst the male's continues to develop.

The authors of the research paper further explain that the rutting calls appear to be understood by rival males as an indicator of the caller's fighting ability.

By contrast to male red deer, who are renowned for roaring with the head elevated, male reindeer emit a hoarse rattling with the head kept low. In this posture the inflated air sac expands the neck region. Both acoustic and optical display serve to deter rival males and thereby prevent fighting, allowing to conserve energy. Simultaneously, the performance serves to attract female mating partners.

Males vocalize almost exclusively during the autumn rutting season whereas females are mostly silent during that period. Instead, vocal communication of females tends to mainly occur with their young, in the first months after the birth in summer. In mother-young communication the air sac individualizes the calls and contributes to individual recognition.


Story Source:

The above story is based on materials provided by Blackwell Publishing Ltd.. Note: Materials may be edited for content and length.


Cite This Page:

Blackwell Publishing Ltd.. "Male Reindeer Inflate Their Air Sac To Make Sexually Enticing Hoarse Rutting Calls." ScienceDaily. ScienceDaily, 12 March 2007. <www.sciencedaily.com/releases/2007/03/070308121827.htm>.
Blackwell Publishing Ltd.. (2007, March 12). Male Reindeer Inflate Their Air Sac To Make Sexually Enticing Hoarse Rutting Calls. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2007/03/070308121827.htm
Blackwell Publishing Ltd.. "Male Reindeer Inflate Their Air Sac To Make Sexually Enticing Hoarse Rutting Calls." ScienceDaily. www.sciencedaily.com/releases/2007/03/070308121827.htm (accessed July 23, 2014).

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