Publicado por: pongpesca | 2016/02/03

Ships’ noise is serious problem for killer whales and dolphins, report finds

1836Low-frequency noise is known to affect baleen whales but high-frequency din from vessels is harming endangered orcas’ ability to communicate and find prey

Noise emanating from passing ships may disturb animals such as killer whales and dolphins far more than previously thought, with new research showing that the animals’ communication and ability to find prey could be hampered by the underwater din.

The low rumble of passing ships has long been connected to the disturbance of large whales. But US researchers have documented persistent noise also occurring at medium and higher frequencies, including at 20,000Hz where killer whales, also known as orcas, hear best.

These noise disturbances could be hindering the ability of killer whales to communicate and echolocate – the process of using sound to bounce off objects such as prey and identify where they are. Dolphins and porpoises, which also operate at higher frequencies, may be suffering the same problems.

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Fonte: The Guardian – 3 de fevereiro de 2016

 

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