Harbor seals in the North Sea got GPS-tagged and tracked for science.
Researchers were blown away when they picked up brand-new organized behavior. Instead of moving randomly as expected, they had picked up some kind of army formation.
While moving through massive, offshore industrial zones, they began traveling in highly organized, straight-line grids.
These predators are rewriting their normal behavior. But what’s drawing them to the turbines in the first place?
How North Sea maps are being reworked by renewable power
Scientists had no idea that this is what they would find when they started following harbor seals with satellites.
Researchers from the University of St. Andrews tagged grey and harbor seals and followed them around the British and Dutch coasts of the North Sea. Their behavior was bizarre, to say the least.
Investigators noted mystery patterns instead of the usual random, meandering paths.
A portion of the seals started swimming in highly organized, straight-lined, grid-like patterns. They were recorded navigating the mazes of turbines like robotic surveyors.
The data showed perfect geometric lines from one pillar to the next.
This striking, grid-like behavior leaves us to question what powerful environmental force could possibly drive these wild marine mammals to abandon their natural hunting grounds for such an artificial routine.
Seals in army formation: A new navigation tactic
The green energy footprint is sparking an evolutionary shift.
As it alters the geography of the North Sea with pipelines and turbines, wildlife behavior responds.
Along with turbines, seals were found tracking undersea pipelines. In some cases, they repeatedly followed it on multiple trips over several days.
The structures offer easy hunting as artificial reefs thrive around turbine bases.
The previously barren ocean floor is transformed into new, thriving ecosystems.
Seals learned quickly to take advantage of the fresh buffets. The wind farms become prime hunting grounds after the initial, disruptive installation phases are over.
But now, fish are concentrated in tight spaces, serving as dangerous traps.
Apex predators like seals don’t have to work as hard, making the fish super vulnerable to overhunting.
Seals’ intelligence sees them exploiting the situation even further, according to the study, “Offshore wind farms become magnets for hungry seals,” published in Science.
Mapping and formations: Animal intelligence at its best
The artificial reef ecosystem starts quickly by attracting pioneering marine life like barnacles, mussels, and anemones. These colonies were established in under a year.
This biological buildup cascades up the food chain.
Atlantic cod populations can be up to one hundred times denser around turbine bases compared to their usual habitats.
This concentrated food source allows harbor seals to reduce foraging trips by hours.
The highly calculating, opportunistic seals have now mapped the industrial grid formations of the pipelines and turbines.
The satellite data shows straight lines as they move directly from one turbine to the next.
Seals have cracked the code of the modern, industrial sea
It became clear that the seals were checking them for potential prey. While doing so, they conserve energy normally spent on finding the prey in the first place.
The seals are covering shorter distances, too.
This evolution in response to the boom in clean energy infrastructure indicates a fascinating, broader trend across our oceans.
Seals and other predators are greedily using our clean-energy infrastructure as their own personal, highly optimized restaurants.
It looks like a win for all stakeholders now. But the situation will need to be super closely monitored over generations of wildlife for the long-term effects to become clear.
As we continue to change ocean landscapes to suit our green energy demands, are we accidentally designing a more resilient ocean ecosystem?
Or are we rewriting the rules of nature in ways we cannot yet predict or understand?