Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Dolphins Speak With Half-Nose

01.11.2004


Russian researchers have recorded the sounds audible only inside the right part of the dolphin’s nasal passage. Animals produce them during echolocation. This research can shed light on how the cetacea produce ultrasonic signals.



Researchers of the Severtsov Institute of Ecology and Evolution Problems, Russian Academy of Sciences, have obtained the confirmation of the hypothesis that the cetacea, dolphins in particular, produce sounds with the help of some pneumatic mechanism, i.e. by driving air under pressure in the depths of the organism. It is assumed that the animals’ right nasal passage is involved in the production of sounds.

The point is that dolphins turn out to be capable of producing special internal sounds but the sounds can be heard only during echolocation. These sounds are called “internal” as they are not heard on the outside (the researchers have managed to make out the sounds only with the help of special internal sensors). They can be heard only in a single location – in the right part of the dolphin’s nasal passage. According to the researchers, these sounds resemble whistle or meowing. The frequency and other properties of these sounds differ significantly from the so-called communicating whistle with the help of which dolphins communicate with each other.


Apparently, dolphins do not produce these sounds on purpose. There exist two versions of their origin: probably they accompany the process of overblowing the air in the organs responsible for production of ultrasonic signals. Or perhaps, internal sounds “result” from pressure difference in various parts of the nasal passage when the air goes through of them. This version is also confirmed by measuring air pressure in the dolphins’ respiratory system.

Sergey Komarov | EurekAlert!
Further information:
http://www.informnauka.ru

More articles from Life Sciences:

nachricht How brains surrender to sleep
23.06.2017 | IMP - Forschungsinstitut für Molekulare Pathologie GmbH

nachricht A new technique isolates neuronal activity during memory consolidation
22.06.2017 | Spanish National Research Council (CSIC)

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Quantum thermometer or optical refrigerator?

23.06.2017 | Physics and Astronomy

A 100-year-old physics problem has been solved at EPFL

23.06.2017 | Physics and Astronomy

Equipping form with function

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>