In a study published in Science Advances, researchers equipped six narwhals with satellite transmitters to collect oceanographic data from the Arctic. The narwhals, often called 'unicorns of the sea' for their spiral tusks, dove to depths of up to 1,500 meters, providing unprecedented measurements of water temperature and salinity in regions that are difficult to access, especially during winter.
The data revealed that the Arctic Ocean is warming at an alarming rate, with deep-water temperatures increasing faster than previously estimated. This warming threatens the narwhals' habitat and the entire Arctic ecosystem, which is already experiencing record-low sea ice extent.
Narwhals are uniquely suited for this task because they are deep-diving mammals that inhabit the high Arctic year-round. By attaching sensors to the animals, scientists can gather data from under the ice in winter, a time when traditional research vessels cannot operate. The study highlights the importance of using marine mammals as 'scientists' to monitor climate change in remote and harsh environments.
The findings underscore the urgent need for climate action to protect the Arctic and its inhabitants. As the region warms, narwhals face threats from habitat loss, changing prey availability, and increased human activity. Continued monitoring with animal-borne sensors will be crucial for understanding and mitigating these impacts.
