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Indo-Pacific bottlenose dolphin © Mike Bossley/WDC

Last captive Indo-Pacific bottlenose dolphin to be freed in South Korea

Bibongi, the last Indo-Pacific bottlenose dolphin held in captivity in South Korea, is to be...
Common bottlenose dolphin

100 bottlenose dolphins hunted in Faroe Islands

This morning, (July 29th), 100 bottlenose dolphins were killed in Skálafjörður on the Faroe Islands. The...

Whales left to die in agony as grenade harpoons fail to explode

Evidence has emerged of grenade-tipped harpoons failing to explode when fired into fin whales by...

Elusive whale seen alive for the first time

Using DNA evidence, scientists have been able to officially confirm the first live sightings of...
All policy news
  • All policy news
  • Create healthy seas
  • End captivity
  • Prevent deaths in nets
  • Stop whaling
  • Strandings
Sperm whale © Douglas Hoffman

Featured policy news item

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc magna elit, gravida at lectus vitae,...
sea_world_orlando_rob_lott

Holiday giant Thomas Cook stops selling tickets to Seaworld and Loro Parque

Holiday giant Thomas Cook stops selling tickets to Seaworld and Loro Parque Following a three...

Endangered Southern Resident orca loses newborn calf

In heartbreaking news from the Pacific Northwest, the Center for Whale Research has reported that...
srkw_shoup_2003_text

U.S. Defense Bill weakens protections for whales

24 July 2018, Plymouth, MA: The FY2019 National Defense Authorization Act conference report was released...

Doubts remain after Icelandic Marine Institute claims slaughtered whale was a hybrid not a blue

Experts remain sceptical of initial test results issued by the Icelandic Marine Institute, which indicate...
f0k5103-2

Did Icelandic whalers really kill a blue whale?

*Warning - this blog contains an image that you may find upsetting* They say a...
iron_gate_dam_klamath

One step closer to more salmon for endangered Southern Resident orcas

On June 28, 2018, the Klamath River Renewal Corporation (KRRC) filed “The Definite Plan” for...
monodon_monoceros-wdc3

Narwhals and Bowhead whales threatened by new Arctic shipping routes

A NASA-funded study has warned that marine creatures like whales and dolphins will be exposed...
japanese_whaling_2005_-_minke_whales_credit_jeremy_sutton-hibbert_for_use_until_28.2.17_1

Japan set to resume commercial whaling

Reports from Japan suggest that the government they will formally propose plans to resume commercial...
hvalfjordur_035

Iceland flouts international ban to slaughter first protected fin whale of new hunting season

Icelandic whaling company Hvalur hf has slaughtered an endangered fin whale today in defiance of...
l92_dave_ellifrit_cwr

Southern Resident orca L92 missing as community returns to the Salish Sea

We are very sad to share news announced today by the Center for Whale Research...
whale_alert_flag_san_juan_county

New actions in the Northwest to help Southern Resident orcas and salmon

As the Washington State Task Force starts to examine threats to the endangered Southern Resident...
All news
  • All news
  • About whales & dolphins
  • Corporates
  • Create healthy seas
  • End captivity
  • Green Whale
  • Prevent deaths in nets
  • Scottish Dolphin Centre
  • Stop whaling
  • Stranding
  • Whale watching
Indo-Pacific bottlenose dolphin © Mike Bossley/WDC

Last captive Indo-Pacific bottlenose dolphin to be freed in South Korea

Bibongi, the last Indo-Pacific bottlenose dolphin held in captivity in South Korea, is to be...
Common bottlenose dolphin

100 bottlenose dolphins hunted in Faroe Islands

This morning, (July 29th), 100 bottlenose dolphins were killed in Skálafjörður on the Faroe Islands. The...

Whales left to die in agony as grenade harpoons fail to explode

Evidence has emerged of grenade-tipped harpoons failing to explode when fired into fin whales by...

Elusive whale seen alive for the first time

Using DNA evidence, scientists have been able to officially confirm the first live sightings of...
All policy news
  • All policy news
  • Create healthy seas
  • End captivity
  • Prevent deaths in nets
  • Stop whaling
  • Strandings
Sperm whale © Douglas Hoffman

Featured policy news item

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc magna elit, gravida at lectus vitae,...
sea_world_orlando_rob_lott

Holiday giant Thomas Cook stops selling tickets to Seaworld and Loro Parque

Holiday giant Thomas Cook stops selling tickets to Seaworld and Loro Parque Following a three...

Endangered Southern Resident orca loses newborn calf

In heartbreaking news from the Pacific Northwest, the Center for Whale Research has reported that...
srkw_shoup_2003_text

U.S. Defense Bill weakens protections for whales

24 July 2018, Plymouth, MA: The FY2019 National Defense Authorization Act conference report was released...

Doubts remain after Icelandic Marine Institute claims slaughtered whale was a hybrid not a blue

Experts remain sceptical of initial test results issued by the Icelandic Marine Institute, which indicate...
f0k5103-2

Did Icelandic whalers really kill a blue whale?

*Warning - this blog contains an image that you may find upsetting* They say a...
iron_gate_dam_klamath

One step closer to more salmon for endangered Southern Resident orcas

On June 28, 2018, the Klamath River Renewal Corporation (KRRC) filed “The Definite Plan” for...
monodon_monoceros-wdc3

Narwhals and Bowhead whales threatened by new Arctic shipping routes

A NASA-funded study has warned that marine creatures like whales and dolphins will be exposed...
japanese_whaling_2005_-_minke_whales_credit_jeremy_sutton-hibbert_for_use_until_28.2.17_1

Japan set to resume commercial whaling

Reports from Japan suggest that the government they will formally propose plans to resume commercial...
hvalfjordur_035

Iceland flouts international ban to slaughter first protected fin whale of new hunting season

Icelandic whaling company Hvalur hf has slaughtered an endangered fin whale today in defiance of...
l92_dave_ellifrit_cwr

Southern Resident orca L92 missing as community returns to the Salish Sea

We are very sad to share news announced today by the Center for Whale Research...
whale_alert_flag_san_juan_county

New actions in the Northwest to help Southern Resident orcas and salmon

As the Washington State Task Force starts to examine threats to the endangered Southern Resident...

Early warning signs signalled collapse of whale numbers

Commercial whaling devastated whale populations during the 20th century and as the whalers targeted the largest individuals, so the body size of bluefinsei and sperm whales, dramatically shrank. 

A new scientific study by the University of Zurich in Switzerland shows that in the case of the sperm whale, they were around four metres shorter on average by the 1980s than they had been at the start of the century. It would suggest that the warning signs of what would happen to whales stocks were detectable up to 40 years before they collapsed.

A similar pattern has also been discovered in fish stocks that have been heavily depleted, indicating that recording the size of a species could be used as a method to monitor its population health and implement conservation efforts when warning signs appear.

Full report:
Body size shifts and early warning signals precede the historic collapse of whale stocks
Christopher F. Clements, Julia L. Blanchard, Kirsty L. Nash, Mark A. Hindell, Arpat Ozgul
Nature Ecology & Evolution 1, Article number: 0188 (2017)

About George Berry

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