Abstract
The retreat of summer ice in the Arctic during the past 5 years has been accompanied by a surge of alarm about iconic ice‐associated marine mammal species: polar bears, walrus, ringed seals, and others. Changes for subarctic species of mammals, fishes, and planktonic organisms have not received as much attention, but will also need to be monitored. The paucity of data about Arctic marine mammals is now more than ever a serious impediment to good decision making. One of the greatest sources of hope is the tremendous advance in marine bioacoustic sensing technology that has occurred within the past decade. Passive and active acoustic technologies offer new means of obtaining biological data in a summer Arctic Ocean where ice is less available as a platform for animals and scientists, and in a winter Arctic Ocean that will continue to be one of the most difficult research environments in the world.
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