Blue whales have been dropping pitch incrementally over several decades, but the cause has remained a mystery. A new study finds a seasonal variation in the whales’ pitch correlated with breaking sea ice in the southern Indian Ocean. The new research also extends the mysterious long-term falling pitch to related baleen whales and rules out noise pollution as the cause of the global long-term trend, according to the study’s authors.
Original Title: Whale songs' changing pitch may be response to population, climate changes
Full Text of the Original Article: https://www.sciencedaily.com/releases/2018/11/181128182153.htm