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Whales in waters around Russia could still be captured

Whales in waters around Russia could still be captured

A Russian ‘expert’ working group has concluded that the exploitation of whales and dolphins for...
Mercury Learning plus Humble Bundle equals a $28k donation for WDC!

Mercury Learning plus Humble Bundle equals a $28k donation for WDC!

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Important step forward for WDC’s fight to stop tragic deaths of dolphins and porpoises in nets

Important step forward for WDC’s fight to stop tragic deaths of dolphins and porpoises in nets

Scientific advisors to the European Commission (ICES) have officially announced their agreement with WDC and...

Earthquake disrupts sperm whales’ feeding for a year

Sperm whales have large brains

A new study has revealed how an earthquake affected the ability of a group of ‘dazed and confused’ whales to find food for over a year.

Kaikoura is a coastal town on the South Island of New Zealand known for its abundant marine wildlife including a population of sperm whales.

On November 14th, 2016 a 7.8-magnitude earthquake shook the region triggering widespread mudslides in the underwater canyon off the coastline, altering the undersea landscape.

Scientists had been monitoring over 50 sperm whales in local waters for many years before the tremors hit. After the earthquake it was noticed that the whales spent about 25 per cent more time at the surface than before.

Researchers from the University of Otago had the advantage of all the previous data, so when the earthquake struck they knew where the sperm whales were and also their usual behaviour patterns.

‘With sperm whales, because they feed at deep depth and spend so much time underwater, it's hard to know exactly what is going on but you can use these times at the surface to determine what they are doing,’  says lead researcher, Dr Marta Guerra.

More time on the surface means the whales were probably spending time and effort diving and searching for food because of less prey to feed on or having to "re-familiarise" themselves with underwater areas that may have changed.

The study also found large underwater sounds produced by earthquakes and aftershocks caused hearing damage and behavioural changes.

The whales' behavioural changes lasted for around a year before returning to normal levels.

More fascinating facts about whales and dolphins.

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