Navigation Links
No place like home: New theory for how salmon, sea turtles find their birthplace
Date:12/1/2008

t baby turtles use magnetic information to help guide them during their first migration across the Atlantic Ocean. And in 2004 they discovered that sea turtles several years of age possess a more sophisticated "magnetic map" sense that helps them navigate to specific areas rich in food.

Sea turtles and salmon are among nature's most impressive ocean travelers but, no matter how long or far they journey, both seem to remember where home is. Some populations of sea turtles, for example, cross entire oceans and are absent from their home beach for more than a decade before returning to reproduce. Salmon hatch in rivers, then migrate hundreds of miles out into the ocean before returning to their home river several years later to spawn.

Just why marine animals migrate such vast distances to return to their own birthplace, sometimes bypassing other suitable locations along the way, is not known. Scientists speculate that natal homing evolved because individuals that returned to their home areas to reproduce left more offspring than those that tried to reproduce elsewhere.

"For animals that require highly specific environmental conditions to reproduce, assessing the suitability of an unfamiliar area can be difficult and risky," Lohmann said. "In effect, these animals seem to have hit on a strategy that if a natal site was good enough for them, then it will be good enough for their offspring."

The study notes that the Earth's magnetic field changes slightly over time and thus probably only helps animals arrive in the general region of their birthplace. Once an animal is close to the target, other senses, such as vision or smell, may be used to pinpoint specific reproductive sites. Salmon, for example, are known to use smell to locate spawning grounds once they have drawn near.

Lohmann said one problem making it difficult to test the new theory is the low survival rate of sea turtles. Only one out of about 4,000 baby sea turtle
'/>"/>

Contact: Patric Lane
patric_lane@unc.edu
919-962-8596
University of North Carolina at Chapel Hill
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Emphasis on conifer forests places multiple species at risk
2. Opportunity for students displaced by Katrina to assess climate vulnerability of Southeast US
3. IEEE-USA innovation forum will help prepare US tech leaders to prosper in a global marketplace
4. In-vitro fertilization improved with 3-D/4-D-guided embryo transfer and new placement target
5. Single-largest biodiversity survey says primary rainforest is irreplaceable
6. Katherine Freed wins first place at the International ISPE Undergraduate Poster Contest
7. Listen-up ladies: Dont postpone knee-replacement surgery
8. MU researcher links hormone replacement therapy to breast cancer
9. A place in the sun
10. Testosterone replacement theraphy beneficial in men 60 and older
11. Clues to ancestral origin of placenta emerge in Stanford study
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/28/2014)... mobile app called TX Invasives is now available from ... of Texas at Austin for identifying harmful non-native plant, ... species in the United States cause about $137 billion ... agricultural crops, clog waterways, kill native plants and more. ... app for reporting where invasive species occur, we,re more ...
(Date:8/28/2014)... of America (ESA) is pleased to announce the selection ... the Society. Honorary Membership acknowledges those who have served ... in the affairs of the Society that has reached ... by the ESA Governing Board and then voted on ... at the Awards Ceremony at Entomology 2014, ESA,s Annual ...
(Date:8/28/2014)... handful of bacterial culprits that may drive inflammatory bowel ... using patients, own intestinal immune responses as a guide. ... journal Cell . , Trillions of bacteria exist ... role in the development and progression of IBD. Yet ... species affect a person,s susceptibility to IBD and its ...
Breaking Biology News(10 mins):Mobile app makes ID of harmful plants, insects in Texas a snap 2Fred Baxendale selected as Honorary Member of the Entomological Society of America 2Yale study identifies possible bacterial drivers of IBD 2
... Adept at blending in with their surroundings, cuttlefish are ... and can switch between them almost instantaneously. New research ... May 2006 issue of the journal Vision Research, confirms ... based on visual cues, they do so while being ...
... systemic spread of avian influenza virus in cats infected ... by Rimmelzwaan et al., "Influenza A virus (H5N1) infection ... of virus spread within and between hosts," appears in ... and is accompanied by a commentary. , ...
... unblemished skin and slow developing gills appear to be ... group of fish whose adults thrive in icy waters ... Such adaptations are important, researchers at the University of ... least two species of notothenioids that inhabit the Ross ...
Cached Biology News:Cuttlefish masters of disguise despite colorblindness 2Avian influenza virus in mammals spreads beyond the site of infection to other organ systems 2Thin tough skin, slow-growing gills protect larval Antarctic fish 2Thin tough skin, slow-growing gills protect larval Antarctic fish 3
(Date:8/29/2014)... (PRWEB) August 29, 2014 Three ... Energy's 2014 Hydrogen Production R&D Award ... by splitting water using sunlight. , Shared with ... and the University of Nevada, Las Vegas (UNLV), ... developing models of photoelectrochemical solar-hydrogen production and corrosion ...
(Date:8/29/2014)... Due to a misstatement posted by the Family ... Technology Center, LLC ( ASCTC ) was reported as an ... might benefit ALS patients. Because of ASCTC's exclusive focus ... and therapeutic applications, FRC listed ASCTC as one of several ... wish not to support research that requires the death of ...
(Date:8/29/2014)... (PRWEB) August 29, 2014 A major ... the biotech start-up dense realm of Boston-Cambridge, is gaining ... able investors. James Sherley, the Director of Boston’s Adult ... the local and national visibility of his company an ... 2013. , In addition to a social media marketing ...
(Date:8/29/2014)... TX (PRWEB) August 29, 2014 ... ISO 13485:2003 certified, GAMP® 5 compliant imaging core ... an international Phase II clinical trial to assess ... , Throughout this trial, Intrinsic Imaging will provide ... limited to, protocol and charter development, site qualification, ...
Breaking Biology Technology:Livermore Team Awarded for Hydrogen Production Research 2The Adult Stem Cell Technology Center, LLC Declines ALS Ice Bucket Challenge Donors Wishing to Support Ethical Research for New Stem Cell Therapies 2The Adult Stem Cell Technology Center, LLC Declines ALS Ice Bucket Challenge Donors Wishing to Support Ethical Research for New Stem Cell Therapies 3The Adult Stem Cell Technology Center, LLC Participates in Multiple Stem Cell and Regenerative Medicine Conferences Before Year End 2The Adult Stem Cell Technology Center, LLC Participates in Multiple Stem Cell and Regenerative Medicine Conferences Before Year End 3The Adult Stem Cell Technology Center, LLC Participates in Multiple Stem Cell and Regenerative Medicine Conferences Before Year End 4Intrinsic Imaging Awarded Phase II Clinical Trial to Assess New Treatment for Non-Hodgkin’s Lymphoma 2
... , , for amplification of GC-rich targets (up to , ... , , , , , , ... Unique enzyme blend of Taq DNA Polymerase and , Pwo DNA Polymerase[a ... The GC-RICH PCR System also includes: , ...
... , for one-step RT-PCR amplification of up to , ... Cat. No. 2 016 346 250 reactions , , , ... The system contains a unique enzyme blend of , ... Note: C. therm. Polymerase provided by Roche Applied Science is the recombinant , ...
... , Mark R. Kagan 1 , Julian Phillips 2 , , Carrie ... , 2Thermo Finnigan, San Jose, CA; , 3Eisai Research Institute, ... , The data presented here can be acquired using the Thermo Finnigan LCQ Series , ... Introduction , , ...
Cached Biology Technology:GC-RICH PCR System 2C. therm. Polymerase One-Step RT-PCR System 2C. therm. Polymerase One-Step RT-PCR System 3Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 2Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 3Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 4Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 5Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 6Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 7Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 8Analyzing Trace-Level Impurities of a Pharmaceutical Intermediate Using , an LCQ Deca Ion Trap Mass Spectrometer and the Mass Frontier , Software Package 9
HybriWell™ hybridization sealing system, 22 mm x 22 mm chamber, 0.15 mm deep *set of 100*...
HybriWell™ hybridization sealing system, 20 mm diameter chamber, 0.15 mm deep *set of 100*...
Recombinant Feline IL-5...
... Express Cloning Checker Kits provide two highly ... transformation without time-consuming plasmid preparation. By using ... all you need to do is to ... directly from the transformation plates into the ...
Biology Products: