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:1/22/2015)... Washington , January 20, 2015 Investorideas.com, ... tech stocks, releases video from the CES 2015 (Consumer Electronics ... Apollo Robbins . Apollo shows how easily ... smart wallet, a product of NXT-ID, Inc. (NASDAQ: ...
(Date:1/22/2015)... 22, 2015 Research and Markets ( ... "Global Wearable Technologies Market and Applications, Opportunities, ... and Forecast 2014-2020" report to their offering. ... devices that can be worn on the user,s ...
(Date:12/24/2014)... , Dec. 23, 2014  Since its launch in December 2014, the ... eliminate the pain of trying to remember their usernames and ... fused to their smartphones. To assist people who have struggled ... company that created 1U and focuses on redefining identity, announced ...
Breaking Biology News(10 mins):Apollo Robbins Talks about the Illusion of Personal Safety and How Easily Your Wallet is Stolen; If a Wocket Wallet is Stolen the Thief Can't do Anything With it! 2Apollo Robbins Talks about the Illusion of Personal Safety and How Easily Your Wallet is Stolen; If a Wocket Wallet is Stolen the Thief Can't do Anything With it! 3Global Wearable Technologies Market and Applications, Opportunities, Industry Analysis, Segmentation, Size, Growth, Share, Overview, Trends and Forecast 2014-2020 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 3
... of many proteins has been found to constitute one ... nature, researchers have discovered. The engineers and biologists from ... their discovery could lead to a new understanding of ... could provide potent nanoscale "shock absorbers" or "gate-opening springs" ...
... found that the curry spice turmeric holds real ... cancer, particularly when combined with certain vegetables. , ... along with phenethyl isothiocyanate (PEITC), a naturally occurring ... that includes watercress, cabbage, winter cress, broccoli, Brussels ...
... an uncanny ability to skim through text, instantly recognizing ... 6000 years ago--long after humans evolved. Thus, neuroscientists ... called the Visual Word Form Area (VWFA) is truly ... Functional MRI scans have shown that the area specifically ...
Cached Biology News:Protein 'nanosprings' most resilient found in nature 2Protein 'nanosprings' most resilient found in nature 3Protein 'nanosprings' most resilient found in nature 4Curry and cauliflower could halt prostate cancer 2'Word-vision' brain area confirmed 2
(Date:2/27/2015)... , Feb. 27, 2015 Bionomics Limited ... the DisrupTOR-1 trial of BNC105 in patients with metastatic ... Orlando, Florida . The data will ... the City of Hope Comprehensive Cancer Center in ... The new data identifies Ferritin and IL-8 ...
(Date:2/27/2015)... (PRWEB) February 27, 2015 Cytokinetics, Incorporated ... on February 28 with patients and health care advocates ... for Rare Disease Day®. Rare Disease Day is ... calling attention to the special challenges faced by patients ... , “Cytokinetics is proud to stand alongside patients and ...
(Date:2/26/2015)... Feb. 26, 2015 S&P Capital IQ (MHFI) ... Report coverage on MabVax Therapeutics Holdings Inc . ... clinical stage biotechnology company focused on the development of ... in the treatment of cancer. MabVax has discovered a ... protective immune responses generated by patients who have been ...
(Date:2/26/2015)... 2015 /PRNewswire/ - SQI Diagnostics Inc. ("SQI" or the ... that develops and commercializes proprietary technologies and products for ... results for the fiscal first quarter ended December  31, ... Canadian dollars (CAD), unless otherwise stated. ... business from our existing customers and add to our ...
Breaking Biology Technology:New BNC105 Biomarker Data to be Presented at US Cancer Conference 2New BNC105 Biomarker Data to be Presented at US Cancer Conference 3New BNC105 Biomarker Data to be Presented at US Cancer Conference 4New BNC105 Biomarker Data to be Presented at US Cancer Conference 5Cytokinetics Joins Global Movement to Raise Awareness for Rare Diseases 2Cytokinetics Joins Global Movement to Raise Awareness for Rare Diseases 3Cytokinetics Joins Global Movement to Raise Awareness for Rare Diseases 4Cytokinetics Joins Global Movement to Raise Awareness for Rare Diseases 5Cytokinetics Joins Global Movement to Raise Awareness for Rare Diseases 6S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 2S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 3S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 4S&P Capital IQ Initiates Coverage on MabVax Therapeutics Holdings Inc. in S&P Capital IQ Factual Stock Reports 5SQI Diagnostics Reports First Quarter Financial Results 2SQI Diagnostics Reports First Quarter Financial Results 3SQI Diagnostics Reports First Quarter Financial Results 4SQI Diagnostics Reports First Quarter Financial Results 5SQI Diagnostics Reports First Quarter Financial Results 6
... 4 Biotest Pharmaceuticals,Corporation, a leading developer ... new management team as part of the ... Pharmaceuticals (Nasdaq:,NABI) and the creation of Biotest ... Pharmaceuticals Corporation Completes Acquisition,of Nabi Biologics Business ...
... Dec. 4 Biotest Pharmaceuticals,Corporation, a leading ... it has completed the acquisition of the ... unit for $185 million,in cash. Biotest Pharmaceuticals ... announced the acquisition of the Nabi Biologics ...
... Genetics to Provide Testing for Important Cancer and Leukemia Group ... ... Genzyme Genetics,a business unit of Genzyme Corporation (Nasdaq: GENZ ), ... sponsored by,the National Cancer Institute. The multi-center study will include 1,700,newly diagnosed ...
Cached Biology Technology:Biotest Pharmaceuticals Corporation Announces Management Team 2Biotest Pharmaceuticals Corporation Announces Management Team 3Biotest Pharmaceuticals Corporation Completes Acquisition of Nabi Biologics Business Unit 2Biotest Pharmaceuticals Corporation Completes Acquisition of Nabi Biologics Business Unit 3National Cancer Institute Study to Determine the Optimal Time for CLL Patients to Begin Treatment 2National Cancer Institute Study to Determine the Optimal Time for CLL Patients to Begin Treatment 3National Cancer Institute Study to Determine the Optimal Time for CLL Patients to Begin Treatment 4
Anti-Phospho-JKK/SEK1/MKK4 pAb Description: 100 g rabbit polyclonal antibody. Reacts with human/mouse/rat. Tested in WB. Research Focus: signal transduction Storage: -20C Shipping Tem...
...
... Target Retrieval Solution, High pH ... heat-induced target retrievel prior to immunohistochemical staining ... paraffin-embedded tissue sections mounted on glass slides. ... pH, 9.9, is especially effective. It should ...
... A very potent Rnase ... effective over a broad range ... This protein does not inhibit ... polymerase, AMV and M-MLV reverse ...
Biology Products: