A researcher’s favorite whale from the population of Glacier Bay humpbacks returned after disappearing during a heat wave where water temperatures increased substantially.
A female humpback whale Glacier Bay National Park and Preserve biologists know as #219 breaches in the waters near the park. When a whale breaches, it often leaves behind flakes of skin on the surface of the ocean. Scientists can collect sloughed skin and send it to a laboratory to learn about the genetics or diet of the whale.
Then one late August day in 2017, Gabriele’s colleague Janet Neilson spotted a familiar whale tail in Icy Strait, just southeast of Glacier Bay. It was 219. Even though 219 made it through the warm period — when waters of the northeastern Pacific Ocean were 4 to 10 degrees Fahrenheit above normal from California to the Gulf of Alaska — she looked stressed.
Baleen whales like the humpback have an incredible ability to fast: When migrating in December, January and parts of February, humpbacks can survive on their fat reserves. But they rely on finding plentiful food when they return to Alaska waters in spring.
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