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Climate change

"Zombie Worm" Absence Sparks Ecosystem Collapse Worries in Deep-Sea Experiment

Strategic Insights

— 1 min read

Scientists have been left concerned after a 10-year marine experiment off the coast of British Columbia failed to detect a key deep-sea species, the Osedax worm, in whale bones nearly a kilometer below the surface. This "zombie worm" is responsible for decomposing whale remains and supporting deep-sea biodiversity. However, the absence of Osedax worms in the study points to a potential breakdown in this process, which may be triggered by climate change.

Key Takeaways:

  • The 10-year marine experiment, conducted by researchers from the University of Victoria and Ocean Networks Canada (ONC), aimed to monitor the presence of Osedax worms in whale bones nearly 1,000 meters below the surface at Barkley Canyon.
  • Despite using high-resolution underwater cameras, no signs of the Osedax worm were detected in the 10-year study period.
  • The absence of Osedax worms may be attributed to low concentrations of oxygen present at the observation site.
  • The expansion of oxygen minimum zones, driven by climate change, is reducing habitat viability for species like Osedax and Xylophaga bivalves.
  • The potential loss of Osedax species could lead to a decline in deep-sea biodiversity, as they play a critical role in recycling whale remains.
  • Preliminary data suggests the decline may not be limited to one location, with an ongoing whale fall study at Clayoquot Slope indicating a possible decline in Osedax populations.
  • Fabio De Leo, senior staff scientist at ONC, warns that the absence of Osedax worms and other decomposers could signal an ecosystem collapse.

Statistics:

  • 10 years: duration of the marine experiment
  • 1,000 meters: depth at which whale bones were placed in Barkley Canyon
  • No signs detected: Osedax worms in the 10-year study period
  • Low concentrations: oxygen present at the observation site
  • 2025: copyright year of the publication (Abbotsford News)

Sources:

  • Abbotsford News (2025)
  • Ocean Networks Canada (ONC)
  • University of Victoria

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