By using sophisticated GPS tracking to monitor seals' every movement, researchers have shown for the first time that some individuals are repeatedly drawn¹ to（接近） offshore² wind farms and pipelines³. Those man-made structures probably serve as artificial reefs and attractive hunting grounds, according to a study published in the Cell Press journal Current Biology on July 21. "I was shocked when I first saw the stunning⁵ grid⁶ pattern of a seal track around Sheringham Shoal," an offshore wind farm in the United Kingdom, says Deborah Russell of the University of St Andrews. "You could see that the individual appeared to travel in straight lines between turbines, as if he was checking them out for potential prey⁷ and then stopping to forage⁸ at certain ones."

 

Russell and her colleagues tagged harbor and gray seals on the British and Dutch coasts of the North Sea. Their data showed 11 harbor seals within two active wind farms, Alpha Ventus in Germany and Sheringham Shoal in the southeast UK. At both sites, some individual seals regularly entered the wind farms and, in some cases, showed these striking grid-like movement patterns as they appeared to forage at individual turbines.

 

The researchers also observed both gray and harbor seals associating with subsea pipelines. Two seals in the Netherlands encountered a section of pipeline⁴ and followed it on multiple trips for up to 10 days at a time.

 

It's not yet clear what the implications for seals and their prey will ultimately be as the number of active wind farms continues to grow, the researchers say.

 

"Only a small proportion of our study seals utilized⁹ wind farms or pipelines," Russell says. "At present these structures cover a small proportion of the extent of the at-sea distribution of seals. As wind farms become more extensive, many more seals will likely be affected¹⁰."

 

The researchers now hope to continue their research to understand the population consequences of the massive planned developments. For instance, no one knows yet whether wind farms increase the total amount of prey available to seals or simply concentrate prey in a new and man-made location, making the prey particularly vulnerable to predation. The researchers say it will be imperative¹¹ to resolve this uncertainty¹² so that anthropogenic structures can be designed and managed to reduce adverse¹³ and increase any positive effects of these structures.

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