Sounding the alarm.

The sound of the blue whale’s singing has decreased off the coast of California, frightening scientists who believe it is an indication of greater ecosystem danger.

Scientists tracked the auditory songs of three whale species – blue, fin and humpback – in the North Pacific Ocean in the California Current Ecosystem (CCE) over six years. 5

The research, using a hydrophone on the ocean floor, analyzed the frequency of the structured sequences of sounds, commonly referred to as song, emitted by the large baleen whales, to define the prevalence in this foraging habitat and its potential use in behavioral ecology research.

The study, published in Public Library of Science in February, found a decrease in song detection for both blue and fin whales across two of thr

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