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:10/16/2014)... cultivated efficiently, they are anything but sustainable: environmental ... cultivation is becoming increasingly evident. Despite their disadvantages, ... are regarded as the sole possibility of achieving ... finds Bernhard Schmid, an ecology professor at the ... of agriculture and forestry. After all, a new ...
(Date:10/15/2014)... pandemic risk from strains of influenza virus increases with ... to become complacent that the most substantial threats have ... Influenza pandemics arise when a new virus strain – ... – spreads in the human population. There have been ... worst of which – the 1918 Spanish Flu – ...
(Date:10/15/2014)... 15, 2014 NXT-ID, Inc. (NASDAQ: NXTD ... on the growing mobile commerce market releases photos and video of ... on Monday October 13 th . Gino ... and angel investor Mr. Chad A. Verdi rang ... NXT-ID thanked his investors and employees "for their work and dedication ...
Breaking Biology News(10 mins):Plant communities produce greater yield than monocultures 2Plant communities produce greater yield than monocultures 3Scientists 'must not become complacent' when assessing pandemic threat from flu viruses 2Photo Release: NXT-ID Inc. Rings Opening Bell of the NASDAQ Stock Market October 13th 2Photo Release: NXT-ID Inc. Rings Opening Bell of the NASDAQ Stock Market October 13th 3
... more vulnerable to their environment during embryonic development than ... the University of Glasgow in the UK. Until now, ... unfavorable conditions during the embryonic stage in birds have ... published in Springers journal, Behavioral Ecology and Sociobiology. ...
... gun and storage chest, JERICHO, N.Y., May 6 ... it has added two new products,to its smartTOUCH product ... retailers and online specialty sites., "We are excited ... our,smartTOUCH product line of consumer based finger activated products. ...
... of brain injury, a way to rejuvenate dead nerve ... glaucoma at home, number among this years nine winners ... surprises me every time I walk through this showcase ... many NJIT graduate and undergraduate students, said NJIT Provost ...
Cached Biology News:Seagulls: Are males the weaker sex? 2bioMETRX, Inc. Introduces New Products 2NJIT applauds students for studies on brain injury, glaucoma and more 2
(Date:10/20/2014)... YORK , Oct. 20, 2014 ... their experimental ZMapp™ antibody therapeutic to fight the ... how difficult and time-consuming the production of pharmaceuticals ... market research publisher said that while some may ... of this compound, those with industry knowledge are ...
(Date:10/20/2014)... 20, 2014  GenVec, Inc. (NASDAQ: GNVC ) ... Ph.D., from its board of directors effective on October 24, ... and served as its chairman from June 2006 to November ... and Corporate Governance and Audit Committees of the board.  ... decade of dedicated service to GenVec, and its stockholders," said ...
(Date:10/19/2014)... (PRWEB) October 19, 2014 The Latin ... the market in Latin America with analysis and forecast ... in 2013, and is expected to reach $2,366.8 million ... to 2018. , Browse through the TOC of the ... idea of the in-depth analysis provided. It also provides ...
(Date:10/19/2014)... 2014 The Asia-Pacific Speech Analytics market ... Asia-Pacific with analysis and forecast of revenue. This market ... to $208 million by 2019, at a Compound Annual ... , Browse through the TOC of the Asia-Pacific Speech ... in-depth analysis provided. It also provides a glimpse of ...
Breaking Biology Technology:Kalorama: ZMapp Highlights Need For Faster Biopharmaceutical Production 2Kalorama: ZMapp Highlights Need For Faster Biopharmaceutical Production 3Zola P. Horovitz To Retire From GenVec Board 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 3The Asia-Pacific Speech Analytics market is estimated to reach $208 million by 2019 - New Report by MicroMarket Monitor 2The Asia-Pacific Speech Analytics market is estimated to reach $208 million by 2019 - New Report by MicroMarket Monitor 3The Asia-Pacific Speech Analytics market is estimated to reach $208 million by 2019 - New Report by MicroMarket Monitor 4
... fluorescent proteins in neurons, neuroscientists at Harvard University are imaging ... cells in a riotous spray of colors dubbed a "Brainbow." ... the Nov. 1 issue of the journal Nature by a ... Jeff W. Lichtman. , Brainbow allows researchers to tag neurons ...
... VANCOUVER, Oct. 31 /PRNewswire-FirstCall/ - Dragon Pharmaceutical ... announced that its biotech method,for 7ACA production ... production,line. Management believes this achievement validates the ... manufacturing technology. This,technology would bring immediate benefits ...
... Align,Technology, Inc. (Nasdaq: ALGN ), the ... without wires or brackets, has been named to,Deloitte,s ... a,ranking of the fastest growing technology, media, telecommunications, ... & Touche USA LLP, one of,the nation,s leading ...
Cached Biology Technology:Scientists create colorful 'brainbow' images of the nervous system 2Dragon Announces R&D Achievement in Biotech Manufacturing Process 2Dragon Announces R&D Achievement in Biotech Manufacturing Process 3Align Technology, Inc. Ranked 23rd in Deloitte's Technology Fast 50 Program for Silicon Valley Scientific & Medical Equipment, and Bio-Technology Companies 2Align Technology, Inc. Ranked 23rd in Deloitte's Technology Fast 50 Program for Silicon Valley Scientific & Medical Equipment, and Bio-Technology Companies 3
... 97 Cytological Labeling Kit provides a unique ... of cellular targets, including cell-surface receptors and ... Kit contains the patented ELF 97 phosphatase ... precipitate at the site of enzymatic activity ...
... between the various commercial and lab-prepared glass ... the length and GC content of the ... protocol employed all influence the optimal hybridization ... all the different variables to consider, it ...
... Stain combo offers these benefits: ... Offers a safer and ... Eliminates risks to yourself, the environment and your ... bp to >30 kb. UltraPure Agarose is a standard ...
This is a PYREX replacement Allihn condenser with a 34/45 inner joint on the bottom for the No. CLS3840-S 125mL extractor system. The tubulation O.D. on the condenser is 10mm....
Biology Products: