It worked: The analysis identified biotwangs in sound data from the western North Pacific - and revealed a seasonal pattern in the vocalizations.
Writing in Frontiers in Marine Science, the researchers conclude the whales have a 'complex range most likely linked to changing oceanographic conditions in this region.'
As climate change accelerates, they write, they expect the whales' migration patterns to shift poleward along with ocean currents - causing the whales to travel greater distances and work harder to obtain food.
The majority of biotwangs were detected in waters off the Mariana Archipelago and nearby Wake Island, suggesting the calls are specific to a population of Bryde's whales.
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