Navigation Links
Specialization for underwater hearing by the tympanic middle ear of the turtle
Date:3/21/2012

A group of biologists from Denmark and the US led by Jakob Christensen-Dalsgaard, University of Southern Denmark, and Catherine Carr, University of Maryland, have shown that the turtle ear is specialized for underwater hearing. The new discovery is published in Proceedings of the Royal Society B March 21st , Special features of the turtle ear a large, air-filled middle ear and a movable tympanic disk increase its sensitivity for underwater sound. Laser measurements of disk vibrations in response to underwater sound show up to 100-fold larger vibrations of the disk than the surrounding water, most likely because the air volume resonates in an underwater sound field and drives the tympanic disk.

The tympanic middle ear is often seen as an adaptation to hearing in air, but the turtle tympanic ear is an anomaly here, because turtles are generally 100-fold less sensitive than other animals with eardrums, like mammals, birds and reptiles.

However, turtles are amphibious animals, and anatomical and biophysical studies by a group of biologists from Denmark and the US have shown that the ear of the red-eared slider is specialized for underwater rather than airborne sound.

CT scans, laser measurements from the ear under water and auditory evoked responses showed that the turtle ear was more sensitive for underwater than for airborne sound. The sensitivity is caused by the air filled middle ear. Resonance in the air cavity lined by the tympanic disc drives the disc and amplifies its vibrations up to 100 fold under water.

What the turtle is using its sensitive underwater hearing for is unknown. However, the sensitive hearing can be used for prey capture, predator avoidance and navigation under water. An alternative possibility is that turtles communicate by underwater sound. Underwater sound communication is unknown in the red-eared slider, but has recently been described in two other turtle species.


'/>"/>

Contact: Jakob Christensen-Dalsgaard
jcd@biology.sdu.dk
456-550-2448
University of Southern Denmark
Source:Eurekalert

Page: 1

Related biology news :

1. Einstein researchers discover key to cell specialization
2. Study in underwater laboratory may help manage seaweed-eating fish that protect coral
3. UM doctoral student receives the Zale Parry Scholarship from Academy of Underwater Arts and Sciences
4. NOAA, Spain announce cooperative arrangement to preserve maritime underwater heritage
5. Underwater gliders may change how scientists track fish
6. IEEE touts NJIT professor for expertise in underwater acoustic communication
7. MBARI sends underwater robot to study Deepwater Horizon spill
8. Scientists report first remote, underwater detection of harmful algae, toxins
9. Toward cheap underwater sensor nets
10. An underwater drugstore?
11. Little Salt Spring underwater archeological site in Florida receives new funding
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/10/2014)... NXT-ID, Inc., (OTCQB: NXTD) a biometric authentication company focused on ... Pereira was interviewed on July 1 st on ... . Mr. Pereira discusses the company,s next generation smart ... how the Wocket™ aims to replace a traditional wallet with ... Harris tells Gino he has never heard of the ...
(Date:7/10/2014)... Sweden , July 8, 2014 ... has won a new design win (DW). An Asian OEM ... date for mass production start in August 2014.   ... Asian smartphone OEM, which has a planned date for start ... an initial ramp order of SEK 5M, for delivery in ...
(Date:7/10/2014)... An international team ... step of photosynthesis in action for the first time. The ... used the world,s most powerful X-ray flashlight at the US ... molecular complex called photosystem II as it splits water into ... earth,s atmosphere. The researchers report their results in the scientific ...
Breaking Biology News(10 mins):Security and Your Money: Tampa Bay Radio Host Cedric Harris Talks to NXT-ID CEO Mr. Gino Pereira about the Wocket Smart Wallet 2Security and Your Money: Tampa Bay Radio Host Cedric Harris Talks to NXT-ID CEO Mr. Gino Pereira about the Wocket Smart Wallet 3Security and Your Money: Tampa Bay Radio Host Cedric Harris Talks to NXT-ID CEO Mr. Gino Pereira about the Wocket Smart Wallet 4FPC Wins DW and Initial Ramp Order for FPC1021 Touch Sensor for Flagship Smartphone from Asian OEM 2Scientists watch photosynthesis in action 2Scientists watch photosynthesis in action 3
... Calif.) The National Institutes of Health (NIH) has ... chemistry, and biology researchers to develop a highly efficient ... technology provides an entirely new method of discovering and ... of applications, including next-generation disease diagnosis at the point ...
... ongoing destruction of specific neurons within the brain. It affects ... to involuntary movement and loss of muscle co-ordination. New ... Neurodegeneration shows that the RyanR inhibitor Dantrolene is able ... a mouse model of HD. Progressive damage to ...
... the final weeks before delivery is tough for any pregnant ... extreme physical changes that accompany the later stages of pregnancy. ... gait change such as a change in stride length ... Intrigued by the ways that newborn dolphins learn to swim ...
Cached Biology News:Researchers awarded $3.2 million from NIH to pioneer advanced biomolecule discovery technology 2Researchers awarded $3.2 million from NIH to pioneer advanced biomolecule discovery technology 3Pregnancy is a drag for bottlenose dolphins 2
(Date:7/10/2014)... can sit upside down forever. Nanophysics makes sure of that. ... article just published in Physical Review E . Knowledge ... spiders that seem to be able to sit still forever, ... many years. We will soon be able to buy smart ... foot. But the fact is, sooner or later the grip ...
(Date:7/10/2014)... the University of Illinois at Urbana-Champaign provides new ... of spin and heat at the nanoscale, and ... for data storage and information processing. , ... momentum. In a typical charge current, electrons, spin-angular-momentum ... explained David Cahill, a professor of materials science ...
(Date:1/15/2014)... an approach akin to assembling a club sandwich ... Technology (NIST) researchers have succeeded in crafting a ... flammability of foam commonly used in upholstered furniture ... the nanotube-coated polyurethane foam was reduced 35 percent ...
(Date:1/15/2014)... 15, 2014  Bill Jacobs Automotive, a group of car dealerships ... with the Heartland Blood Center and offering free oil change ... takes place Saturday, Jan. 18 at the Bill Jacobs Cadillac ... (Photo: http://photos.prnewswire.com/prnh/20140115/MN46637 )  The Bill ...
Breaking Biology Technology:Even geckos can lose their grip 2University of Illinois study advances limits for ultrafast nano-devices 2Layered security: Carbon nanotubes promise improved flame-resistant coating 2Join the Bill Jacobs Auto blood drive and receive a free oil change 2
... 8, 2011 Quest Diagnostics joined the American Cancer ... the American Cancer Society,s historic Cancer Prevention Study - ... longitudinal study is between November 8 and 19, 2011. ... and genetic factors that influence cancer risk by following ...
... 2011 Accuray Incorporated (Nasdaq: ARAY), the ... results for the first quarter of fiscal 2012 that ... 2011, Accuray completed the acquisition of TomoTherapy. As a ... consolidation of both Accuray and TomoTherapy.  Non-GAAP results are ...
... YORK, Nov. 8, 2011 Reportlinker.com announces ... available in its catalogue: ... Suppliers http://www.reportlinker.com/p0681961/Genomic-Technologies-Market-Insights-for-Life-Science-Suppliers.html#utm_source=prnewswire&utm_medium=pr&utm_campaign=Genomics ... Genomic Technologies: Market Insights for Life Science ...
Cached Biology Technology:Quest Diagnostics Encourages Denver Area Residents to Enroll in Historic American Cancer Society Prevention Study November 8th - 19th 2Quest Diagnostics Encourages Denver Area Residents to Enroll in Historic American Cancer Society Prevention Study November 8th - 19th 3Accuray Announces Results for First Quarter Fiscal 2012 2Accuray Announces Results for First Quarter Fiscal 2012 3Accuray Announces Results for First Quarter Fiscal 2012 4Accuray Announces Results for First Quarter Fiscal 2012 5Accuray Announces Results for First Quarter Fiscal 2012 6Accuray Announces Results for First Quarter Fiscal 2012 7Accuray Announces Results for First Quarter Fiscal 2012 8Accuray Announces Results for First Quarter Fiscal 2012 9Accuray Announces Results for First Quarter Fiscal 2012 10Accuray Announces Results for First Quarter Fiscal 2012 11Genomic Technologies: Market Insights for Life Science Suppliers 2Genomic Technologies: Market Insights for Life Science Suppliers 3
... Throughput Processing of Microarrays Using the New ... multiple slide plate is designed to hold ... multi-well incubation chambers in a microplate footprint ... footprint dimensions meet the standards recommended by ...
fully automated system for the processing of microarrays on microscope slides...
... use spatulas have been designed to save ... for those interested in eliminating the recycling ... spatula is individually packaged, RNase/DNase free, non-pyrogenic ... a new product number, created to easily ...
... use spatulas have been designed to save ... for those interested in eliminating the recycling ... spatula is individually packaged, RNase/DNase free, non-pyrogenic ... a new product number, created to easily ...
Biology Products: