HOME >> BIOLOGY >> NEWS
How do marine turtles return to the same beach to lay their eggs?

benefit? The study has shown that the marine turtles navigation system allows them to maintain their course towards the egg-laying site wherever they find themselves. It is almost as if they were equipped with a compass pointing towards the beach in question. So they can correct any deflection they are subject to: transport by boat, ocean currents But, unlike human navigators, they are not able to correct for ocean drift in plotting their course. So the movements recorded by the satellite are a combination of deliberate action by the turtles and the effect of currents. So it appears that the turtles navigation system is relatively simple and may cause them to be wander at sea for long periods during adverse ocean conditions. One turtle released 250 km from its egg-laying site on Europa traveled more than 3 500 km in two months before returning there!

In the second experiment, the researchers have studied the effect of the earths magnetic field on the turtles navigation system. They have shown, for the first time in natura, that marine turtles use the magnetic field of the earth to orientate themselves. When this field is disturbed by placing a powerful magnet on their heads, turtle navigation is not as good. But the fact that they can still return to their original egg-laying site shows that the geomagnetic field is not the only information source that they use. Researchers think the turtles may also use their sense of smell like certain sea birds or homing pigeons. This hypothesis remains to be proven

This work should improve conservation strategies for marine turtles, an endangered, officially protected species, by providing a better understanding of how they manage these long migrations between egg-laying and feeding areas.


'"/>

Contact: Monica McCarthy
monica.mccarthy@cnrs-dir.fr
0033-196-445-191
CNRS
26-Feb-2007


Page: 1 2

Related biology news :

1. MIT team building robotic fin for submarines
2. New tool for marine conservation
3. Bigelow Laboratory Scientists develop new approach to study marine microbes
4. Study warns deep-sea mining may pose serious threat to fragile marine ecosystems
5. Study shows marine omega-3 fatty acids have positive effect on muscle mass
6. US conservation efforts bring more marine turtles to UK
7. US conservation efforts bring more marine turtles to UK
8. Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply
9. Darwins famous finches and Venters marine microbes
10. Smithsonian scientists discover new marine species in eastern Pacific
11. Regardless of global warming, rising CO2 levels threaten marine life

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: How marine turtles return the same beach lay their eggs

(Date:1/22/2015)... 22, 2015 Research and Markets ( http://www.researchandmarkets.com/research/4trb7t/biometrics_a ) ... Global Market Overview" report to their offering. , ... ensure that an individual is who she/he is claiming to ... of a person,s unique physical characteristics, such as fingerprint, hand ...
(Date:1/22/2015)... FindBiometrics, the leading source of biometrics industry news, interviews and ... "When we launched FindBiometrics 12 years ago the ... founder and CEO of FindBiometrics. "Now it,s maturing very quickly. ... players on a very broad scale.  We are known for ...
(Date:1/22/2015)... Showcase, Hall E -   EyeLock Inc. , a market ... showcase its EyeLock ID technology integrated in a 3D printed ... Oak Ridge National Laboratory (ORNL) at the 2015 ... technology is being used to validate the driver and authorize ...
Breaking Biology News(10 mins):Biometrics - A Global Market Overview 2Biometrics - A Global Market Overview 3Identity Industry Leading Publication Debuts New Look As Biometrics Hit Mainstream 2EyeLock Debuts First Iris Authentication Technology Embedded in 3D Printed Automobile 2EyeLock Debuts First Iris Authentication Technology Embedded in 3D Printed Automobile 3
(Date:3/4/2015)... PDL BioPharma, Inc. (PDL) (NASDAQ: PDLI ... , 3.75% Convertible Senior Notes due May 1, ... per $1,000 principal amount or approximately $5.72 per share, effective ... note is adjusted in connection with the regular quarterly dividend ... stockholders who own shares of PDL on March 5, 2015, the ...
(Date:3/4/2015)... --Research and Markets ( http://www.researchandmarkets.com/research/nqxxt3/biomarkers ) ... report "Biomarkers - Technologies, Markets and Companies" ... report follows the broad definition of a biomarker ... and evaluated as an indicator of normal biological ... to a therapeutic intervention. Tests based on biomarkers ...
(Date:3/4/2015)... , March 4, 2015 AcelRx ... specialty pharmaceutical company focused on the development and ... acute and breakthrough pain, today announced that it ... results after market close on Monday, March 9th, ... call at 4:30 p.m. Eastern Time (1:30 p.m. ...
(Date:3/4/2015)... 4, 2015 Lancée ... Paris en décembre 2011, l,étude collaborative ... », qui compare   l es microsphères ... sorafénib dans le carcinome hépatocellulaire avancé, a recruté ... foie avancé   ; les résultats sont attendus ...
Breaking Biology Technology:PDL BioPharma Announces Conversion Rate Adjustment for Convertible Note 2Global Biomarkers Report 2014-2024 - Technologies, Markets and Companies 2Global Biomarkers Report 2014-2024 - Technologies, Markets and Companies 3AcelRx Pharmaceuticals to Hold Annual 2014 Financial Results Conference Call and Webcast on Monday, March 9th, 2015 2AcelRx Pharmaceuticals to Hold Annual 2014 Financial Results Conference Call and Webcast on Monday, March 9th, 2015 3Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 2Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 3Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 4Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 5Traitement du cancer primitif du foie : Recrutement terminé pour l'étude SARAH et résultats attendus fin 2016 6
Cached News: