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Arctic's 'Unicorns' Track Climate Change
27 May
Summary
- Narwhals are tagged to gather data on Arctic climate shifts.
- Satellite tags record location, temperature, salinity, and dive depths.
- Narwhal data reveals deeper dives and altered migration due to warming.
Narwhals, known for their distinctive spiral tusks, inhabit the Arctic Ocean around Canada, Greenland, and Russia. These whales spend significant time beneath thick sea ice, diving to depths of up to 6,000 feet to feed on fish and squid. Their unique physiology, including the absence of a dorsal fin, allows them to navigate close to the ice surface.
As the Arctic warms, scientists are deploying satellite tags on narwhals to monitor environmental changes. These tags collect data on location, water temperature, salinity, and dive profiles. This information is analyzed by institutions like the Greenland Institute of Natural Resources.
Narwhals serve as critical indicators of climate change because their deep dives are inaccessible to other monitoring methods. The data already indicates that narwhals are diving deeper and traveling further, suggesting rising ocean temperatures. Their migration patterns are also shifting, with earlier arrivals at summer grounds and altered wintering areas.
Furthermore, changes in ocean temperature are affecting the distribution of the narwhals' prey, such as Arctic cod. These fish are moving to cooler, more northerly waters, forcing narwhals to adapt their feeding habits or travel greater distances to find food.
