New study shows the importance of jellyfish falls to deep-sea ecosystems

October 14, 2014
Periphylla periphylla being eaten by squat lobsters (Munida tenuimana)

Innovative experiments carried out by scientists at the National Oceanography Centre (NOC) and abroad show that dead jellyfish contribute to the deep-sea food chain, unlike previously thought.

Researchers from the UK, Norway and Hawaii deployed lander systems to look at how scavengers responded to jellyfish and fish baits in the deep sea off Norway. The experiments were carried out in areas with jellyfish blooms near the ocean surface and showed that when the creatures fell to the seabed they were rapidly eaten by scavengers. 
 
Daniel Jones from the National Oceanography Centre, who is one of the authors of the study, explained: “In recent years, anecdotal studies have suggested that when jellyfish blooms die off, massive quantities of the creatures can sink to the ocean floor to form ‘jelly-lakes’, which are not eaten then simply rot, depleting the oxygen on the ocean floor and repelling fish and other sea creatures. However, as our video footage on YouTube indicates, it seems that ‘jelly-lakes’ may be the exception rather than the rule and that jellyfish carcasses are consumed at speed by a host of deep-sea scavengers such as hagfish and crabs.”
 
Globally there are huge numbers of jellyfish in the ocean, and in some parts, jellyfish blooms are increasing, seemingly as a result of nutrient enrichment and a warming climate. This research has also prompted a fresh look at the role of jellyfish in the carbon cycle. It had been thought that when the jellyfish sank to the seafloor they were essentially taken out of the system. However, the new research shows that this is actually not the case and that the carbon is retained in deep-sea food webs. This is considered to be especially important when other food sources in the deep-sea ecosystems may be decreasing as the ocean warms.
 
The new study was led by Andrew K. Sweetman at the International Research Institute of Stavangar in Norway, in conjunction with NOC and Craig R. Smith at the University of Hawaii in Manoa. The findings have just been published in the prestigious journal Proceedings of the Royal Society: Biological Sciences 20142210
 
Additional time-lapse video footage of sea creatures scavenging jellyfish baits on the ocean floor can be seen below and on our YouTube channel
 

Common North Atlantic jellyfish, Periphylla periphylla

Additional Media
Embedded Video: 

Home | Back to top


Information for…

Business

The outputs of research generate new knowledge about the oceans. Transferring scientific knowledge to support business and industry is an important part of our NOC remit.

More

Researchers

Our research is intended to tackle the big environmental issues facing the world. Research priorities will include the oceans' role in climate change, sea level change and the future of the Arctic Ocean.

More

Students

The University of Southampton and the University of Liverpool both offer a range of highly regarded undergraduate and post-graduate degrees in Ocean and Earth Science.

More

Media

For any media or press enquiries to the National Oceanography Centre follow the more link below. Please note the centre's press office is staffed from 0830 to 1730, Monday to Friday.

More

Staff

NOC Staff can access the Intranet and Webmail resources at the following URLS.

Everyone

Follow what we are up to:

Follow NOCnews on Twitter Follow NOCSnews on Youtube Follow NOC on facebook

Subscribe to our email alerts service:
NOCMail logo

Delivery Partners

Delivery Partners helping to provide marine science national capability.

More

Marine Science Community

The creation of a wider association of Universities and research institutions to support wider engagement of the NOC with the marine science community is now underway.

More 

Library

The National Oceanographic Library is a national resource for the UK marine science community.

More 

Principal scientists

All updated information for cruise participants can be found using the Marine Facilities Planning website:

More