[OANNES Foro] Seabirds track energy in tidal currents

[Mario Cabrejos]

'Drifters of opportunity': Seabirds track energy in tidal currents

by  <https://news.mongabay.com/by/ongabay-com/> Mongabay.com 

3 December 2018

https://news.mongabay.com/2018/12/drifters-of-opportunity-seabirds-track-ene
rgy-in-tidal-currents/?utm_source=Mongabay+Email+Alerts&utm_campaign=af3751d
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Data from GPS-tagged seabirds, as they were swept along in the strong
currents of the Irish Sea, could help researchers move a step closer to
harnessing the energy in those shifting tides.

Four years of tracking razorbills (Alca torda) helped Matt Cooper and his
colleagues from Bangor University and the Royal Society for the Protection
of Birds in the U.K. understand more about the
<https://commons.wikimedia.org/w/index.php?title=File%3ARazorbill_(Alca_tord
a)_(W1CDR0001424_BD7).ogg> squawking black-and-white bird's behavior. They
learned, for example, that razorbills sit for long stretches at night on the
water's surface, when they're pretty much tossed around by the energy of the
sea. That gave the team an idea, Cooper said.

"We saw this as an opportunity to re-use the data and test if the birds
might be drifting with the tidal current," Cooper, an oceanographer and
former graduate student at Wales's Bangor University, said in a
<https://www.egu.eu/news/450/what-seabirds-can-tell-us-about-the-tide/>
statement. "We took data that was discarded from the original study and
applied it to test a hypothesis in a different area of research."

Typically, researchers use a combination of high-tech buoys and radar
systems to better their understanding of moving currents. But these can also
be pricey. Seabirds like razorbills, on the other hand, already spend much
of their time on the water, and the ones that provided these insights were
the subject of the team's behavioral study between 2011 and 2014 off the
coast of northern Wales. The biologists had attached GPS tracking tags that
noted each bird's location every 100 seconds for up to five days at a time.
This research used recordings from 49 tagged razorbills from a colony on
Puffin Island.

Once they'd come up with this hypothesis that seabirds could provide this
information, the team sifted through the data, stripping out times when the
birds were flying. The current in this part of the Irish Sea can move at 1
meter or more per second (3.3 feet per second) - faster than razorbills can
swim - so the researchers could determine when the current was carrying the
birds along.

"[Their] changing position would reflect the movement of water at the
ocean's surface," Cooper said in the statement.

When Cooper and his colleagues compared the collected data and compared it
with a mathematical model of currents in this part of the Irish Sea, they
discovered that rafts of these birds provided solid information on the
direction and speed of the flow of water on the surface. The study,
published Nov. 29 in the journal  <https://www.ocean-sci.net/14/1483/2018/>
Ocean Science, is the first the authors know of that uses birds to track
currents, they wrote.

https://imgs.mongabay.com/wp-content/uploads/sites/20/2018/12/03061943/pictu
re1_alt.jpg

A map shows the drifting of razorbills on currents in the Irish Sea. Image
courtesy of  <https://www.ocean-sci.net/14/1483/2018/> Cooper et al., 2018.

It's not a perfect solution, the authors caution, because the birds won't
stay put the way human-made buoys might.

"We must remember that these birds are behaving naturally and we cannot
determine where they go," Cooper said.

Still, he and his colleagues hope that "drifters of opportunity" - that is,
razorbills and other seabirds that biologists study, sometimes in far-flung
corners of the world - might pinpoint viable places where we could harvest
renewable, tidal energy in the future.

Citation 

Cooper, M., Bishop, C., Lewis, M., Bowers, D., Bolton, M., Owen, E., & Dodd,
S. (2018). What can seabirds tell us about the tide? Ocean Science, 14(6),
1483-1490. https://doi.org/10.5194/os-14-1483-2018

 



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