Navigation Links
Migrating squid drove evolution of sonar in whales and dolphins, researchers argue
Date:9/5/2007

thed whales, the sperm whale, grows up to 60 feet long and dives to 3,000 meters - nearly two miles - in search of squid. Though poorly known because they live entirely in the deep ocean, the many species of the beaked whale dive nearly as deep. Belugas and narwhals descend beyond 1,000 meters, while members of the dolphin family - porpoises, killer whales and pilot whales, for example - all can dive below the 200-meter mark where sunlight is reduced to darkness.

According to Pyenson, who focuses on the evolution of whales, the first whales entered the ocean from land about 45 million years ago, and apparently did not echolocate. Their fossil skeletons do not have the scooped forehead of today's echolocating whales, which cups a fatty melon-shaped ball that is thought to act as a lens to focus clicking noises.

Skulls with the first hints of a concave forehead and potential sound-generating bone structures arose about 32 million years ago, Pyenson said, by which time whales presumably had spread throughout the oceans. Whales had developed underwater hearing by about 40 million years ago.

According to Lindberg, whale biologists had various theories about echolocation, including that whales developed this biosonar soon after entering the water as a way to find food in turbid rivers and estuaries. The evolution of toothed whales, however, indicates otherwise. Whales first occupied the ocean, and only later invaded rivers. Other experts have proposed that development of echolocation coincided with global cooling around 33.5 million years ago, though a mechanism was not specified.

The most convincing explanation, that echolocation allowed whales to more efficiently find food in the darkness of the deep ocean, ignores the question of evolution.

"How did the whales know there was a large supply of food down in the dark"" asked Lindberg, noting that cephalopods are the most abundant and high-energy resource in the ocean, eaten by
'/>"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. New tool reveals secrets of migrating cells
2. E. coli bacteria migrating between humans, chimps in Ugandan park
3. Bats prey on nocturnally migrating songbirds
4. Ancient amphibians evolved a bite before migrating to dry land
5. Squid skin reveals hidden messages
6. Squid-inspired design could mean better handling of underwater vehicles
7. Tracking sperm whales and jumbo squid
8. Ancient global warming drove early primates dispersal
9. Molecular biology fills gaps in knowledge of bat evolution
10. Same mutation aided evolution in many fish species, Stanford study finds
11. Researchers trace evolution to relatively simple genetic changes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/14/2014)... face the decision of whether to get a ... decision can be even more challenging. Now, a ... decisions in families of children with autism and ... parents reported the benefits of dog ownership included ... to learn responsibility. , "Children with autism spectrum ...
(Date:4/14/2014)... plant growth chamber bound for the International Space ... resupply mission may help expand in-orbit food production ... astronauts something they don,t take for granted, fresh ... to study the in-orbit function and performance of ... and its plant "pillows." The investigation will focus ...
(Date:4/14/2014)... sponges sound like creatures from a B-grade horror movie. ... the deep sea. Scientists first discovered that some sponges ... seven carnivorous species have been found in all of ... marine biologist Lonny Lundsten and two Canadian researchers describes ... deep seafloor, from the Pacific Northwest to Baja California. ...
Breaking Biology News(10 mins):Dog ownership benefits families of children with autism, MU researcher finds 2Veggie will expand fresh food production on space station 2Researchers describe 4 new species of 'killer sponges' from the deep sea 2Researchers describe 4 new species of 'killer sponges' from the deep sea 3
... National Science Foundation (NSF), bioengineers from the University of ... to characterize the thousands of control elements critical to ... mix and match these "DNA parts" in synthetic organisms ... a single designer microbe can take years to create ...
... easy as plugging it into your tee shirt or jeans, ... reporting an advance in that direction with an easier way ... e-Textiles that double as a rechargeable battery. Their report ... a monthly journal. "Wearable electronics represent a developing new ...
... applications ranging from medical devices such as MRIs to surveillance ... of 1996, Congress directed the government to sell essentially all ... government for its investment in the helium and its storage. ... from the National Research Council, assesses whether selling off the ...
Cached Biology News:NSF grant to launch world's first open-source genetic parts production facility 2NSF grant to launch world's first open-source genetic parts production facility 3NSF grant to launch world's first open-source genetic parts production facility 4
(Date:1/15/2014)... January 15, 2014 This webinar ... on nonclinical and clinical safety assessment in biosimilars. ... guide a path for biosimilar drug development, however ... of biosimilarity with regards to quality, safety and ... of biosimilar drug development and registration, development strategies ...
(Date:1/15/2014)... NC (PRWEB) January 15, 2014 ... an enhancement to its Online Web Portal for Life ... now have the ability to specify the subject matter ... nearly 50 life science sub-domains. This will help reduce ... and scientific fields, and decrease the likelihood of error. ...
(Date:1/14/2014)... Doylestown, PA (PRWEB) January 14, 2014 ... – 11 p.m. , Location: Warrington Country Club, 1360 ... Hepatitis B Foundation, the only national nonprofit organization solely ... improving the quality of life for those affected worldwide, ... 11 at Warrington Country Club in Warrington, Pa. ...
(Date:1/14/2014)... York, NY (PRWEB) January 14, 2014 ... initiated coverage of Alliqua, Inc. (OTCQB: ALQA). Alliqua ... and marketing proprietary products to serve the wound ... , In late 2012, Alliqua was restructured ... launched the company’s new strategy to become a ...
Breaking Biology Technology:Xtalks Life Sciences Webinar Examines Safety Assessment of Biosimilars 2DTS Improves Efficiency for Life Science Document Translations 2Hepatitis B Foundation to Host Annual Crystal Ball Gala 2EquitiesIQ Initiates Coverage of Alliqua, Inc. 2EquitiesIQ Initiates Coverage of Alliqua, Inc. 3
... cellular biologists have made tremendous scientific advances by ... and pathways. Researchers at the University of Wisconsin-Madison ... understanding by putting the pieces back together, mathematically. ... biological engineering, developed computer models of a relatively ...
... ST. LOUIS, Feb. 6 Stereotaxis, Inc. (Nasdaq:, ... financial results for the,fourth quarter and full year ended ... market opens. The Company will host a conference call ... Eastern Time to discuss,the Company,s fourth quarter results and ...
... by $14 millionSEATTLE, Feb. 6 Cell Therapeutics, Inc. ... has engaged the services of a strategic advisory consulting ... developing strategic options for a partnership, asset divestment or ... the preclinical drug development arm of CTI, in Bresso, ...
Cached Biology Technology:Mathematical models reveal how organisms transcend the sum of their genes 2Stereotaxis Announces Fourth Quarter and Full Year 2008 Earnings Release Date and Conference Call 2CTI Seeks Strategic Alternative for Italian Facility 2CTI Seeks Strategic Alternative for Italian Facility 3
Anti-GOSR2 Monoclonal AntibodyOther Sub-Family: not assigned-Other Applications: Immunocytochemistry, Immunoprecipitation, Western Blot...
Mouse monoclonal [4A2.2] to SLC6A4 ( Abpromise for all tested applications). entrezGeneID: 6532 SwissProtID: P31645...
... The 2/3D Waver Shaker combines shaking and ... with a 330 x 330 mm stainless steel ... top incubator and cold room operation. The platform ... degree for a vigorous with action and rotation ...
Anti-DNA Polymerase a, Human Description: 50 l Research Focus: cancer & cell proliferation Storage: 4C Shipping Temperature: 4C...
Biology Products: