Navigation Links
Migrating sea turtles have magnetic sense for longitude
Date:2/24/2011

ntil they reach the poles, where they are directed straight down into the Earth. The magnetic field also varies in intensity, being generally strongest near the poles and weakest near the equator. Both parameters appear to vary more reliably from north to south than east to west, which had led many researchers to conclude that the magnetic field is useful only for latitudinal information.

"Although it is true that an animal capable of detecting only inclination or only intensity would have a hard time determining longitude, loggerhead sea turtles detect both magnetic parameters," Putman said. "This means that they can extract more information from the Earth's field than is initially apparent."

What had been overlooked before is that inclination and intensity vary in slightly different directions across the Earth's surface, Putman added. As a result of that difference, particular oceanic regions have distinct magnetic signatures consisting of a unique combination of inclination and intensity.

The researchers made the discovery by subjecting hatchlings to magnetic fields replicating those found at two locations, both along the migratory route but at opposite ends of the Atlantic Ocean. Each location had the same latitude but different longitude. The turtles were placed in a circular water-filled arena surrounded by a computerized coil system used to control the magnetic field and tethered to an electronic tracking unit that relayed their swimming direction.

Turtles exposed to a field like one existing on the west side of the Atlantic near Puerto Rico swam to the northeast. Those exposed to a field like that on the east side of the Atlantic near the Cape Verde Islands swam to the southwest.

The findings may have important implications for the turtles, the researchers say.

"This work not only solves a long-standing mystery of animal behavior but may also be useful in sea turtle conservation," Lohmann said. "Underst
'/>"/>

Contact: Elisabeth Lyons
elyons@cell.com
617-386-2121
Cell Press
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Satellite data reveal why migrating birds have a small window to spread bird flu
2. Even small patches of urban woods are valuable for migrating birds
3. Migrating birds chill to fatten up
4. Conservationists seek to identify prime stopover sites for migrating birds
5. Why leatherback turtles linger in South Pacific Gyre, and why it matters
6. Epic journeys of turtles revealed
7. How diving leatherback turtles regulate buoyancy
8. Commercial fishing estimated to kill millions of sea turtles
9. How can accidental captures of loggerhead turtles be reduced?
10. Turtles Christmas journey tracked by scientists
11. National Science Foundation Fellow uses ultrasound to research bog turtles
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/9/2014)... cell divides, it must first make a copy of its ... that occurs billions of times a day in the human ... tools that cells use to replicate DNAthe enzymes that unzip ... a clear picture of how the process works. , Now, ... to decipher what goes on at the "replication fork"the point ...
(Date:7/8/2014)... reefs and the animals that depend on them relies ... sea creature to get fatand to be flexible about ... the first study of its kind, scientists at The ... live symbiotically with algaeare better able to recover from ... keep large energy reservesmostly as fatsocked away in their ...
(Date:7/8/2014)... increased risk of severe perineal tearing during childbirth in women ... a new study published today (9 July) in BJOG: ... This study, investigates among women who have had a third ... subsequent pregnancies and the recurrence of severe perineal tears. ... in some women the tear may be more extensive. A ...
Breaking Biology News(10 mins):Rockefeller scientists first to reconstitute the DNA 'replication fork' 2Rockefeller scientists first to reconstitute the DNA 'replication fork' 3Rockefeller scientists first to reconstitute the DNA 'replication fork' 4For corals adapting to climate change, it's survival of the fattest -- and most flexible 2For corals adapting to climate change, it's survival of the fattest -- and most flexible 3For corals adapting to climate change, it's survival of the fattest -- and most flexible 4Mode of delivery following a perineal tear and recurrence rate in subsequent pregnancies 2
... of corals are likely to succeed at the expense of ... in the Cell Press journal Current Biology that ... "The good news is that, rather than experiencing wholesale ... the mix of coral species as the ocean warms and ...
... genomes, says a new study of poison frogs from ... changes over time, but the rate at which those ... Juan C. Santos of the National Evolutionary Synthesis Center ... trying to explain why some species have faster-changing genomes ...
... ARLINGTON, Va.The deafening roar of supersonic aircraft can cause ... so the Office of Naval Research (ONR) is funding ... announced April 12. "The noise problem falls into ... noise impact on the communities surrounding air bases," said ...
Cached Biology News:Under climate change, winners and losers on the coral reef 2Athletic frogs have faster-changing genomes 2ONR taps research teams to help reduce jet noise 2
(Date:1/15/2014)... device," Nobel laureate Herbert Kroemer famously observed, referring ... the junctures where layers of different materials meet. ... between layers of metal oxides are becoming increasingly ... spintronics, high-temperature superconductors, ferroelectrics and multiferroics. Realizing the ...
(Date:1/15/2014)... Jan. 15, 2014   Niagara Thermal Products is ... Buffalo BioBlower Technologies LLC ("B3") as the critical thermal ... award from the Army Corps of Engineers.  B3 has ... all biological contaminants and destroys VOCs and other chemical ...
(Date:1/15/2014)... SAN JOSE, California , January 15, 2014 ... for cancer, today announced the appointment of Thomas C Reynolds ... over 20 years, development experience gained in the biotechnology industry, ... "I am delighted to welcome Tom at this transformative ...
(Date:1/15/2014)... A study has been launched to test whether ... could help to tackle the problem of obesity.  This unique ... surgery based in Stowmarket) and academics at University Campus Suffolk ... technology, which is inspired by equipment used to collect data ...
Breaking Biology Technology:A deeper look at interfaces 2Niagara Thermal Products LLC Selected as Critical Supplier for Buffalo BioBlower Air Purification Systems 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4
... 2011  Amgen (NASDAQ: AMGN ) announced that its ... for the first quarter of 2012. This represents an approximate 29 ... The dividend will be paid on March 7, 2012 to ... on Feb. 15, 2012.  About Amgen ...
... Inc. (PDL) (NASDAQ: PDLI ) today announced that ... payment of $0.15 per share to all stockholders owning shares ... (Logo: http://photos.prnewswire.com/prnh/20110822/SF55808LOGO )   ... humanization of monoclonal antibodies and, by doing so, enabled the ...
... tune and enhance thermal conductivity a basic property generally ... engineers a new tool for managing thermal effects in smart ... devices. The finding was made by a group of ... at Vanderbilt University, and published online in the journal ...
Cached Biology Technology:Amgen Announces 2012 First Quarter Dividend 2Amgen Announces 2012 First Quarter Dividend 3New method for enhancing thermal conductivity could cool computer chips, lasers and other devices 2New method for enhancing thermal conductivity could cool computer chips, lasers and other devices 3
... The IHC Select Immunophosphatase Secondary Detection System ... IHC Select Prediluted Primary Antibody reagents, which ... qualitative identification of antigens by light microscopy ... Secondary Detection System may also be used ...
... FLISP Assay with SR-101 Labeled Substrates ... • Accurately measure serine protease activation ... • B-Bridge's FLISP Kits utilize cell-permeable, ... (FLISPs) to measure chymotrypsin-like activity in ...
From the company that first brought you the chromatin immunoprecipitation (ChIP) kit, a new and improved kit, EZ-ChIP, is now available to make your experiments easier, quicker, and most importantly,...
The PDS-1000 He Hepta system includes the PDS-1000 He biolistic system and the Hepta adaptor....
Biology Products: