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Third orca death in 18 months at theme park

Loro Parque tourist attraction in Tenerife, Spain has announced the death of Kohana, a 20-year-old...

WDC’s Shorewatch work shortlisted for nature award

We are thrilled that our Shorewatch programme has been shortlisted in the Citizen Science category...
Image from one of the WDC Risso's dolphin research catalogues

Local community helps piece together Risso’s dolphin puzzle

Thousands of photographs from members of the public have been published today in two WDC...

Tesco joins new initiative to help protect whales and dolphins

Tesco, the UK's largest retailer has joined WDC, Sustainable Fisheries Partnership (SFP), and the Royal Society...

Mass whale stranding linked to extreme man-made noise for the first time

A detailed investigation into a highly unusual mass stranding in May-June 2008 in which about 100 melon-headed whales washed up around the Loza Lagoon, northwest Madagascar has concluded that the cause was likely to have been high levels of underwater noise from sonar used by an oil exploration company to map the seabed. 

The report says that noise  from a high-power 12kHz multibeam echosounder system operated by a survey vessel contracted by ExxonMobil Exploration and Production (Northern Madagascar) Limited was determined to be the most likely cause of the mass stranding.

While aspects of this tragic event will remain unknown, the Independent Scientific Review Panel systematically excluded or deemed highly unlikely nearly all potential reasons for the animals leaving their typical offshore habitat and entering the Loza Lagoon. Seismic airguns, used in an offshore seismic survey several days after the whales were already in the lagoon system, were ruled out.

The multibeam echosounder system operated intermittently about 65km offshore by a survey vessel the day before the first known stranding. 

Evidence of the widespread impacts of intense noise pollution continues to be felt by an increasing number of whale and dolphin species throughout the worlds’ oceans. Regulators, and marine users that generate intense noise pollution, need to reassess how we manage and mitigate these disruptive and sometimes fatal sources of pollution. Noise-reducing alternatives to noisy sound sources should be advanced wherever possible”.

The full report can be found here: http://iwc.int/2008-mass-stranding-in-madagascar

 

About George Berry

George is a member of WDC's Communications team and website coordinator.