September 27, 2024 — A mysterious sound heard booming from deep under the ocean waves has finally been traced to a fascinating source.
First recorded in 2014 in the west Pacific, the “biotwang” is actually the call of the Bryde’s whale (Balaenoptera brydei) traveling long distances in the open ocean. What’s more, the techniques used to identify the sound have led to the development of a new tool for understanding whale populations and how they move about in and inhabit Earth’s enigmatic seas.
“Bryde’s whales occur worldwide in tropical and warm temperate waters, but their population structure and movements are not well understood,” writes a team led by biological oceanographer Ann Allen of NOAA Pacific Islands Fisheries Science Center in Hawaii.
“Our results provide evidence for a pelagic western North Pacific population of Bryde’s whales with broad distribution, but with seasonal and inter-annual variation in occurrence that imply a complex range most likely linked to changing oceanographic conditions in this region.”