Offshore wind farms create 'reef effect' perfect for marine wildlife - especially seals
Fish and crustaceans tend to cluster on the structures
Monday 21 July 2014
Wind farms and wildlife do not always go together: the giant turbines have been accused of luring species to their death, and the noise they generate can drive away certain marine mammals.
But wind farms have an unexpected benefit if you happen to be a harbour seal hunting for food in British waters, according to a new study. They are a magnet for hungry seals eager to take advantage of the fact that fish and crustaceans tend to cluster on the structures – which become artificial reefs for marine life over time.
Offshore wind farms can be fertile feeding grounds for seals who choose to seek them out – concludes the study, by an international team of researchers from Britain, Holland and the US, published yesterday in Current Biology Journal.
This is because the presence of a hard structure beneath the waves attracts barnacles and other crustaceans, and, in turn, fish. Dr Deborah Russell, a research fellow at the Scottish Oceans Institute at the University of St Andrews, explained how the “reef effect” attracts seals. “Things like barnacles and mussels will settle on hard structures and then that in turn will attract other marine species and it builds up over time.”
Dr Russell, the lead researcher on the study, told The Independent: “The seals will be eating fish that are attracted to the artificial reef; we are not actually sure what species they are eating but I think it might be species like cod and whiting.” The turbines attract mussels and barnacles at their bases – which in turn attract predators
Researchers analysed data from GPS tags used to track the movements of harbour and grey seals in the North Sea since 2008. 11 harbour seals were found to have visited two wind farms in the North Sea - Alpha Ventus, off the German coast, and Sheringham Shoal, off the British coast. Several became regular visitors to wind farms and “showed striking grid-like patterns of movements as they concentrated their activity at individual turbines,” states the study. “The data strongly suggest that these structures were used for foraging and the directed movements show that animals could effectively navigate to and between structures.”
In one particular case, a seal repeatedly returned to a wind farm off the coast of North Norfolk. “I was shocked when I first saw the stunning grid pattern of a seal track around Sheringham Shoal,” said Dr Russell. “You could see that the seal appeared to travel in straight lines between turbines, as if he was checking them out for potential prey and then stopping to forage at certain ones.”
The study, part funded by the Department of Energy and Climate Change, “is the first to show that marine mammals are preferentially going to a structure to forage at that structure itself,” she added.
But although it may be good news for hungry harbour seals, it could turn out to be a “mixed blessing,” she said, as it is not yet known whether wind farms could become “ecological traps” for prey species.
Dr Russell cautioned that the research does not rule out the possibility of adverse impacts of the development or presence of manmade structures on marine wildlife. “The study only considered the effect on marine mammals during the operational stage of wind farms. It is during the construction phase that wind farms are predicted to have the most dramatic negative effect on marine mammals.”
Cow 'emissions' more damaging to planet than CO2 from cars
Zoo keeping for beginners: Mucking out with the man who inspired a Hollywood film
The ugliest animals on earth: Blobfish, axolotl and proboscis monkey battle it out to be named least attractive beast
Have we reached 'peak food'? Shortages loom as global production rates slow
At long last, Australia is able to halt the relentless advance of the cane toad
- 1 Raif Badawi, the Saudi Arabian blogger sentenced to 1,000 lashes, may now face death penalty
- 2 PornHub turns masturbation into energy in bid to save the planet
- 3 Robert Mugabe eats a zoo for 'obscene' 91st birthday party
- 4 The remarkable archaeological underwater discovery that could open up a new chapter in the study of European and British prehistory
- 5 The jihadi girls who went to Syria weren't just radicalised by Isis — they were groomed
New theory could prove how life began and disprove God
This is what it's like to be dead, according to a guy who died for a bit
'Jihadi John': CAGE representative storms off Sky News accusing Kay Burley of Islamophobia
Ukip would cut billions from Scottish budget to fund English tax cuts
Russia's roadmap for annexing eastern Ukraine 'leaked from Vladimir Putin's office'
Ukraine crisis: Top Chinese diplomat backs Putin and says West should 'abandon zero-sum mentality'
£9 per hour: Recruitment Genius: This role is based within a small family run ...
£28000 - £32000 per annum: Recruitment Genius: This Design and marketing agenc...
£46000 per annum: Recruitment Genius: This property investment firm are lookin...
£18000 - £35000 per annum: Recruitment Genius: This company specialises provid...