“The beam projections have different frequencies and can be sent in different directions. The advantage is probably that the dolphin can locate the object more precisely”, says Josefin Starkhammar, a newly examined doctor in Electrical Measurements at Lund University, who also holds a Master’s degree in Engineering Physics.
The study, which was carried out together with scientists from San Diego, was published in the latest issue of the journal Biology Letters. The co-authors of the article were Patrick W. Moore, Lois Talmadge and Dorian S. Houser, who work at the National Marine Mammal Foundation in the USA.
“The findings add fuel to an already fierce debate in the research community on how the echolocation sound is produced”, says Josefin Starkhammar.
Dr Starkhammar’s own guess is that the two sound projections come from the two different sound-producing organs, the existence of which is well known, but it was believed that only one was active during echolocation. She stresses that more research is needed. For example, the two projections could also be explained by complicated reflections in the head of the dolphin, where the sound is formed.
“It is also somewhat remarkable that this has only been discovered now. Research has been carried out on dolphins and echolocation since the 1960s”, says Josefin Starkhammar.One explanation as to why the discovery has taken so long is that this research requires recently developed and quite advanced measuring equipment and signal processing techniques. In addition, until now it has mostly been biologists who have conducted research on dolphins, and their expertise is often not in this specific area of technology. Furthermore, the research requires dolphins trained to answer scientific questions! The combination of marine biologists and engineers is ideal, in Josefin Starkhammar’s view.
To help her she has developed a device with 47 hydrophones (microphones for use in water).
“It is currently one of the best devices in the world for capturing dolphins’ ultrasound in water”, says Josefin Starkhammar, who has spent a lot of time testing and developing the equipment, including at Kolmården Wildlife Park, where one of her supervisors works. There she has also conducted other studies on dolphins and their echolocation.
Bats also use echolocation and there are a few species of shrew and some cave-dwelling birds which use a simpler form of the method. Even humans have developed devices that use echolocation and ultrasound technology.
“However, dolphins’ echolocation is in many ways much more sophisticated. Evolution has had the possibility to hone it over millions of years. Therefore, we humans have a lot to learn from dolphins. What is more, the knowledge could be important in finding ways to protect dolphins, for example from noise disturbance”, says Josefin Starkhammar.
For more information, please contact Josefin Starkhammar on firstname.lastname@example.org or +46 706 171215.
Megan Grindlay | idw
Cancer diagnosis: no more needles?
25.05.2018 | Christian-Albrechts-Universität zu Kiel
Less is more? Gene switch for healthy aging found
25.05.2018 | Leibniz-Institut für Alternsforschung - Fritz-Lipmann-Institut e.V. (FLI)
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences