The discovery of environmental DNA from fish species that have strayed far from their normal range is an ominous reminder of warming, changing seas.
In the Fram Strait off Greenland’s west coast, Véronique Merten encountered the foot soldiers of an invasion.
It is difficult to estimate an animal’s abundance based solely on the amount of its DNA in the water. Yet Because of the oceans’ global circulation patterns, water routinely flows from the Atlantic into the Arctic. This exchange mostly occurs in deeper water, with currents carrying warm and relatively salty Atlantic water north. This warm Atlantic water, however, doesn’t mix well with the Arctic’s surface water, which is relatively cool and fresh.
Merten’s discovery of abundant capelin in the Fram Strait—as well as the DNA she found from other Atlantic species, like tuna and cock-eyed squid, far outside their typical range—is further proof of just how quickly Atlantification is playing out. And its consequences could be enormous.presents a grim picture of how Atlantification can disrupt Arctic ecosystems.
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