How salmon navigates through ocean to return to home river
Washington: A new study may have solved the mystery of how salmon navigate across thousands of miles of open ocean to locate their river of origin before journeying upstream to spawn.
The researchers say salmon may use magnetic field as navigational aid in the ocean.
In the study, scientists examined 56 years of fisheries data documenting the return of sockeye salmon to the Fraser River in British Columbia - and the route they chose around Vancouver Island showed a correlation with changes in the intensity of the geomagnetic field.
"What we think happens is that when salmon leave the river system as juveniles and enter the ocean, they imprint the magnetic field - logging it in as a waypoint," said Nathan Putman, a post-doctoral researcher at Oregon State University and lead author on the study.
"It serves as a proxy for geographic location when they return as adults. It gets them close to their river system and then other, finer cues may take over," he added.
Earth has a predictable, consistent geomagnetic field that weakens as you move from the poles toward the equator. The magnetic North Pole has an intensity gradient of roughly 58 microtesla, while the equator is about 24 microtesla.
Salmon originating from Oregon that have spent two to four years in the northern Pacific Ocean off Canada or Alaska would return as adults, the scientists speculate, journeying southward off the coast until they reached a magnetic field intensity similar to that of their youth.
"That should get them to within 50 to 100 kilometers of their own river system and then olfactory cues or some other sense kicks on," said Putman, who conducts research in OSU`s Department of Fisheries and Wildlife.
Vancouver Island provides a natural laboratory for the study of salmon, the researchers pointed out. Salmon returning to the Fraser River must detour around the massive island to reach the mouth of the river, choosing a southern or northern route. In their study, the scientists found that the "drift" of the geomagnetic field correlated with which route the salmon chose.
When the normal intensity level for the Fraser River shifted to the north, the sockeye were more likely to choose a northern route for their return. When the field shifted slightly south, they chose a southern route.
This "field drift" accounted for about 16 percent of the variation in the migration route, Putman said, while variations in sea surface temperatures accounted for 22 percent. The interactive effect between these two variables accounted for an additional 28 percent of the variation in the migration route.
"Salmon are a cold-water fish, and all things being equal, they prefer cold water. But the fact that they also demonstrate geomagnetic fidelity in choosing a route shows that this could be a major instrument in their biological toolbox to guide their way home," said Putman, who earned his Ph.D. in biology from the University of North Carolina at Chapel Hill.
Putman said that his previous studies of the Columbia River have shown that the magnetic intensity shifts less than 30 kilometers in either direction over a period of three years, which is about the length of time many salmon spend in the ocean.
"Salmon have to get it right because they only have one chance to make it back to their home river," Putman said, "so it makes sense that they may have more than one way to get there. The magnetic field is amazingly consistent, so that is a strategy that can withstand the test of time. But they may also use the sun as a compass, track waves breaking on the beach through infrasound, and use smell."
Putman and OSU fisheries biologist David Noakes plan to follow through with experiments on varying the magnetic field for salmon in a laboratory setting, using the Oregon Hatchery Research Center in Oregon`s Alsea River basin.
Results of the study were published this week in the journal Current Biology.
More from India
More from World
More from Sports
More from Entertaiment
- IAF Mirage fighter plane lands on Yamuna Expressway!
- 'Maggi' under regulatory scanner for excess amount of lead, MSG
- Watch: Michelle Obama's 'Gimme Five' fitness video
- When Subramanian Swamy shocked people at a wedding!
- Mumbaikars join hands to save Pakistani teen with rare illness
- Mumbai: Diamond export company denies job to Muslim youth
- Aapke Sitare: Astro prediction for May 21, 2015
- PM Modi speaks at Golden Jubilee celebrations of poet Dinkar’s works
- Mirage 2000 fighter jet landing was part of capability demonstration: IAF
- DNA: IAF Mirage 2000 fighter plane lands successfully on Yamuna expressway
- DNA: Osama documents show 'Indian brother in Madinah' financed al Qaeda
- Coal scam: Naveen Jindal, Madhu Koda and others get bail
- Vadodara: Policemen seen dancing with bar girls
- ISIS executes Syrian fighter using anti-tank rocket launcher
- One year of Modi govt: Arun Jaitley addresses press conference
- CBSE Class 10 Results 2015 to be announced today?
- IAF jet lands on Yamuna expressway
- Check Jharkhand Board jac.nic.in: Class 12th Art Results 2015 declared
- Fawad Khan doesn’t want intimate scenes with Sonam Kapoor?
- Log on to apeamcet.org AP EAMCET Results 2015: Andhra Pradesh EAMCET Marks and AP EAMCET Ranks 2015 declared
- We hire only non-Muslim candidates, diamond export firm tells Muslim youth
- Is MSG in 'Maggi' noodles harmful for you?
- Mumbai firm booked for denying Muslim MBA graduate job on religious grounds, probe ordered
- New IPL rules could see Chennai Super Kings lose MS Dhoni
- Jayalalithaa makes public appearance, meets Governor: As it happened
- `Piku` hits jackpot, does Rs 100 crore business worldwide
- Anurag Kashyap to bid goodbye to India, settle in 'cinema-friendly' France!
- SSLC (tnresults.nic.in) Tenth 10th Results 2015: Tamil Nadu Board Class 10th X Higher Secondary exam results 2015 to be announced shortly
- Geelani's passport application incomplete, cannot be processed: MEA
- IPL 2015, Qualifier 2, Chennai Super Kings vs Royal Challengers Bangalore: Preview