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Dangerous Migration: Whales on the Move

Dangerous Migration: Whales on the Move

Humpback whales make some of the longest migrations on Earth. Scientists tracked one whale that traveled 11,770 miles over 265 days from its summer foraging area near the Antarctic Peninsula up to its winter breeding area off Colombia and back again to the Antarctic Peninsula. Throughout the Southern Hemisphere, humpbacks make seasonal migrations like this between the tropics and polar waters, moving along the coasts through the waters of 28 countries and the open ocean that lies beyond the jurisdiction of any nation.

But the growing dangers whales face worldwide along these epic journeys are signs of an ocean in peril and reveal how these waters connect us all.

Whales are essential to a healthy ocean and planet

Along their migrations, whales fertilize the marine ecosystems they move through and support the marine life inhabiting them. Their fecal plumes boost phytoplankton production, which captures about 40% of all carbon dioxide produced and generates over half of the atmosphere’s oxygen. When they die, whales sink to the seabed, taking massive amounts of carbon out of the atmosphere for centuries. Altogether, one whale captures the same amount of carbon over its lifetime as thousands of trees.

This means that by restoring whale populations, we can help restore ocean ecosystems and mitigate and build resilience to climate change. It’s helping nature help itself—and all of us who depend on it.

Northern right whale mother & calf (Eubalaena glacialis) off the Atlantic coast of Florida.

© Brian J. Skerry / National Geographic Stock / WWF

Growing threats to ocean migrations

Despite the vital role they play in the health of our planet and our own lives, whales are facing a barrage of new and growing threats from humans.

As many as 300,000 whales, dolphins and porpoises are killed every year from entanglement in fishing gear. Ever-expanding shipping traffic is leading to more collisions between whales and ships and is more than doubling underwater noise pollution each decade. Climate change is shifting their prey populations, especially in the polar regions, making it harder for them to find food. Eight million tons of plastic enter the sea every year—about one full garbage truck every minute. New research shows whales near large cities ingest around three million microplastics per day.

The crisis unfolding in our ocean is impacting the recovery and health of whale populations in different ways around the globe. While the moratorium on commercial whaling allowed some populations to recover from the brink of extinction, some have not. Six out of the 13 great whale species are now classified as endangered or vulnerable. North Atlantic right whales are at their lowest point in about 20 years, numbering only 366 individuals—a decline of 30% over the past 10 years.

Southern Humpback Whale heat run, Kingdom of Tonga.

© Darren Jew / WWF

Mapping whale superhighways

For the first time, Protecting Blue Corridors—a new report by WWF and our science partners from Oregon State University, University of California Santa Cruz, University of Southampton and many others—visualizes the satellite tracks of more than 1,000 migratory whales worldwide. Importantly, it helps identify where migratory routes and key habitat areas overlap with a range of emerging and cumulative threats from human activities, helping inform how we can better protect and manage their ocean habitats worldwide.

Time for action: Protecting blue corridors for whales, our ocean, and ourselves

As our understanding of whales’ migratory routes and the threats that they face evolve, our approach to conserving and restoring whale populations across their entire range must also evolve. We’re calling for collaboration among researchers, local communities, national and international policymakers, governments and industry to protect blue corridors by:

  1. Securing critical ocean habitats for whales
    • We need to implement a comprehensive network of marine protected areas overlapping national and international waters to protect 30% of our ocean by 2030. This will help protect and conserve whales and many other species while strengthening the ocean’s resilience to climate change.
  2. Safeguarding populations through cooperative efforts
    • Work to achieve ‘zero bycatch’ in fisheries in national and international waters
    • Eliminate and clean up ‘ghost gear’—abandoned, lost or otherwise discarded fishing gear
    • Establish an ambitious UN global treaty to stop the leakage of plastics into our ocean by 2030
    • Move ships away from critical whale habitats where possible
    • Set ship slow-down rules and other measures to reduce underwater noise and risks of ship strikes
  3. Investing in whales for a thriving ocean
    • Integrate the vital ecological role of whales into global and national climate and biodiversity policies
    • Support large-scale collaborative science to inform policy recommendations as part of the UN Decade of Ocean Science

Together, we can protect our ocean giants and make their epic journeys safer for years to come. Learn more about the WWF Protecting Whales & Dolphins Initiative.

By Chris Johnson, Global Lead, WWF Protecting Whales & Dolphins Initiative

About The Author

WWF

The world’s leading conservation organization, WWF works in 100 countries and is supported by 1.3 million members in the United States and close to 5 million globally.

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