Advertisement

Topics

The evolution of the syrinx: An acoustic theory.

07:00 EST 7th February 2019 | BioPortfolio

Summary of "The evolution of the syrinx: An acoustic theory."

The unique avian vocal organ, the syrinx, is located at the caudal end of the trachea. Although a larynx is also present at the opposite end, birds phonate only with the syrinx. Why only birds evolved a novel sound source at this location remains unknown, and hypotheses about its origin are largely untested. Here, we test the hypothesis that the syrinx constitutes a biomechanical advantage for sound production over the larynx with combined theoretical and experimental approaches. We investigated whether the position of a sound source within the respiratory tract affects acoustic features of the vocal output, including fundamental frequency and efficiency of conversion from aerodynamic energy to sound. Theoretical data and measurements in three bird species suggest that sound frequency is influenced by the interaction between sound source and vocal tract. A physical model and a computational simulation also indicate that a sound source in a syringeal position produces sound with greater efficiency. Interestingly, the interactions between sound source and vocal tract differed between species, suggesting that the syringeal sound source is optimized for its position in the respiratory tract. These results provide compelling evidence that strong selective pressures for high vocal efficiency may have been a major driving force in the evolution of the syrinx. The longer trachea of birds compared to other tetrapods made them likely predisposed for the evolution of a syrinx. A long vocal tract downstream from the sound source improves efficiency by facilitating the tuning between fundamental frequency and the first vocal tract resonance.

Affiliation

Journal Details

This article was published in the following journal.

Name: PLoS biology
ISSN: 1545-7885
Pages: e2006507

Links

DeepDyve research library

PubMed Articles [6537 Associated PubMed Articles listed on BioPortfolio]

New perspectives on the origins of the unique vocal tract of birds.

Birds utilize a unique structure, called a syrinx, for the production of their vocalizations. The origins of the syrinx are not well understood. New work, utilizing first principles-based models, sugg...

Neotropical frogs and mating songs: The evolution of advertisement calls in glassfrogs.

Anurans emit advertisement calls with the purpose of attracting mates and repelling conspecific competitors. The evolution of call traits is expected to be associated with the evolution of anatomical ...

Appropriate surgical procedures for Chiari type 1 malformation and associated syrinx based on radiological characteristics of the craniovertebral junction.

Several surgical procedures can be applied for syrinx associated with Chiari type 1 malformation; however, it remains controversial as to which approach is the most effective. Here, we evaluated the i...

Evolution of Sex Chromosome Dosage Compensation in Animals: A Beautiful Theory, Undermined by Facts and Bedeviled by Details.

How do complex animal signals evolve?

Animal signals-involving combinations of acoustic, chemical, visual, and behavioral cues-are among the most diverse traits in nature. Testing hypotheses about signal evolution has been hampered by dif...

Clinical Trials [1326 Associated Clinical Trials listed on BioPortfolio]

Study and Surgical Treatment of Syringomyelia

The goal of this study is to establish the mechanism(s) of progression of primarily spinal syringomyelia (PSS). Our preliminary study of syringomyelia emphasized syringomyelia associated ...

Evaluation of Respiratory Acoustic Monitor in Children After Surgery

The study will evaluate the performance of measuring respiration rate with the Respiratory Acoustic Monitoring (RAM).

Acoustic Neuromodulation (ANM) for Youth With Anxiety Disorders

The acoustic neuromodulation trial (ANM-T) is a two-phase, single-site, pilot randomized clinical trial examining the feasibility of completing a larger scale efficacy study of a novel tre...

Soliton Planar Acoustic Wave Device System for Dermal Clearing Human Trial Protocol

Study of new acoustic wave device as an accessory to laser treatment in tattoo reduction.

Upper Airways in Pregnancy: Evaluation by the Acoustic Reflection Method

It is well known that airway management can be difficult during pregnancy. Increased risks for difficult intubation in pregnant women have been often reported. Thus, pregnancy is regarded ...

Medical and Biotech [MESH] Definitions

The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.

Evolution at the molecular level of DNA sequences and proteins. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)

An interdisciplinary study dealing with the transmission of messages or signals, or the communication of information. Information theory does not directly deal with meaning or content, but with physical representations that have meaning or content. It overlaps considerably with communication theory and CYBERNETICS.

The techniques used to produce molecules exhibiting properties that conform to the demands of the experimenter. These techniques combine methods of generating structural changes with methods of selection. They are also used to examine proposed mechanisms of evolution under in vitro selection conditions.

A psychological theory based on dimensions or categories used by a given person in describing or explaining the personality and behavior of others or of himself. The basic idea is that different people will use consistently different categories. The theory was formulated in the fifties by George Kelly. Two tests devised by him are the role construct repertory test and the repertory grid test. (From Stuart Sutherland, The International Dictionary of Psychology, 1989)

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topic

Respiratory
Asthma COPD Cystic Fibrosis Pneumonia Pulmonary Medicine Respiratory Respiratory tract infections (RTIs) are any infection of the sinuses, throat, airways or lungs.  They're usually caused by viruses, but they can also ...


Searches Linking to this Article