Navy efforts to protect whales have limited effect

Naval efforts to protect endangered whales by gradually increasing the noise levels of soner have limited benefit, researchers at the University of St Andrews have found.  The process of slowly raising the noise level of sonar, known as 'ramp up' was adopted by several European navies, and geophysical explorers who use airguns to search for oil and gas reserves, as a method to reduce the harmful impact of very loud sounds produced by humans in the sea.

Paul J. Wensveen et al. Lack of behavioural responses of humpback whales (Megaptera novaeangliae) indicate limited effectiveness of sonar mitigation, The Journal of Experimental Biology (2017).  DOI: 10.1242/jeb.161232

https://phys.org/news/2017-11-navy-efforts-whales-limited-effect.html