Jellyfish have long been a source of concern for swimmers, fish farmers and any machine with an oceanic intake. But they've more recently become a headache for oceanographers, who must puzzle out why jellyfish blooms are on the rise, and how that rise threatens to upset the balance of life in Earth's oceans -- and that's just among the living [sources: Flannery; Gorman]. Because dead jellyfish apparently pose a problem as well: When large die-offs occur, it appears that their bodies just jelly up the ocean floor, where scavengers seemingly turn up their collective noses at them [sources: Gorman]. Or so we thought.
Thanks to experiments conducted by Andrew Sweetman of the International Research Institute of Stavanger and his colleagues, published in the December 2014 issue of Proceedings of the Royal Society B, we now know that scavengers such as crabs and hagfish actually chow down on jellies with at least as much relish as they do mackerel. This is important, because it means that jellyfish are an integral part of the carbon cycle, and not some kind of carrion cul-de-sac [sources: Gorman; Sweetman et al.].
So why the mix-up? It's possible that previous observations only caught mass die-offs and/or that observations took place in areas that lacked jelly-eating scavengers. In other areas, the rapidity with which jellyfish are eaten (around two hours, in the experiment) might have removed any contrasting cases before they would have been observed [sources: Gorman; Sweetman et al.].
Author's Note: 10 Recent Breakthroughs in Marine Biology
This article was enormously fun. I only wish that I'd had more space to describe the methods used in some of these ingenious studies. I hope you'll have a chance to look some of them up.
As much as I enjoy reading about newly discovered species, I think I get an even bigger thrill from learning some new fact about a familiar creature or, better still, finding out that a long-accepted idea does not hold water after all. In researching this article, I found examples of all three.
More Great Links
- Alon, Shahar et al. "The Majority of Transcripts in the Squid Nervous System Are Extensively Recoded by A-to-I RNA Editing." eLife. Jan. 8, 2015. (April 16, 2015) http://elifesciences.org/content/early/2015/01/08/eLife.05198
- Appeltans, Ward et al. "The Magnitude of Global Marine Species Diversity." Current Biology. Vol. 22, no. 23. Page 2189. Dec. 4, 2012. (April 28, 2015)
- Appeltans, Ward et al. "The Magnitude of Global Marine Species Diversity." Current Biology. Vol. 22, no. 23. Page 2189. Dec. 4, 2012. (April 28, 2015) http://ac.els-cdn.com/S0960982212011384/1-s2.0-S0960982212011384-main.pdf?_tid=8c255d94-edf6-11e4-9ec0-00000aab0f6c&acdnat=1430260569_ee637fa30e8f5a33e07de3ec56e6dd93
- Associated Press. "Gassy German Cows Blamed for Barn Explosion." CBS News. Jan. 28, 2014. (April 17, 2015) http://www.cbsnews.com/news/gassy-german-cows-blamed-for-barn-explosion/
- Australian Broadcasting Corporation. "Great Barrier Reef Coral Trout." Nov. 20, 2014. (April 17, 2015) http://www.abc.net.au/catalyst/stories/4132834.htm
- Baggaley, Kate. "Squids Edit Genetic Directions Extensively." Science News. Jan. 13, 2015. (April 16, 2015) https://www.sciencenews.org/article/squids-edit-genetic-directions-extensively
- BBC. "Cows Blamed After Power Cut to 800 Homes Near Dundee." June 2, 2014. (April 17, 2015) http://www.bbc.com/news/uk-scotland-tayside-central-27665843
- Bos, Kirsten I. et al. "Pre-Columbian Mycobacterial Genomes Reveal Seals as a Source of New World Human Tuberculosis." Nature. Vol. 514. Page 494. Oct. 23, 2014. (April 17, 2015) http://www.nature.com/nature/journal/v514/n7523/full/nature13591.html
- Courage, Katherine H. "Octopuses Reveal First RNA Editing in Response to Environment." Scientific American. Jan. 5, 2012. (April 16, 2015) http://blogs.scientificamerican.com/octopus-chronicles/2012/01/05/octopuses-reveals-first-rna-editing-in-response-to-environment/
- Dallas, Mary Elizabeth. "Contagious Cancer Killing East Coast Clams." CBS News. April 9, 2015. (April 19, 2015) http://www.cbsnews.com/news/contagious-cancer-killing-east-coast-clams/
- Diep, Francie. "Pufferfish Don't Hold Their Breaths to Stay Puffed, Scientists Find." Popular Science. Dec. 3, 2014. (April 16, 2015) http://www.popsci.com/pufferfish-dont-hold-their-breaths-stay-puffed-scientists-find
- Doucleff, Michaeleen. "Sea Lions and Seals Likely Spread Tuberculosis to Ancient Peruvians." NPR. Aug. 21, 2014. (April 17, 2015) http://www.npr.org/blogs/goatsandsoda/2014/08/21/341930621/sea-lions-and-seals-swam-tuberculosis-to-ancient-peruvians
- Fessenden, Marissa. "UV Light Reveals the Colors of Fossil Shells." Smithsonian.com. April 2, 2015. (April 17, 2015) http://www.smithsonianmag.com/smart-news/uv-light-reveals-colors-fossil-shells-180954841/?no-ist
- Flannery, Tim. "They're Taking Over!" The New York Review of Books. Sept. 26, 2013. (April 19, 2015) http://www.nybooks.com/articles/archives/2013/sep/26/jellyfish-theyre-taking-over/
- Garrett, Sandra and Joshua J. C. Rosenthal. "RNA Editing Underlies Temperature Adaptation in K+ Channels from Polar Octopuses." Science. Vol. 335, no. 6070. Page 848. Feb. 17, 2012. (April 16, 2015) http://www.sciencemag.org/content/335/6070/848
- Gorman, James. "A Clam Cancer Outbreak, Spread by One Set of Cells." The New York Times. April 13, 2015. (April 19, 2015) http://www.nytimes.com/2015/04/14/science/a-clam-cancer-outbreak-spread-by-one-set-of-cells.html?rref=collection%2Fcolumn%2Fobservatory&_r=0
- Gorman, James. "A Surprising Appetite for Dead Jellyfish." The New York Times. Nov. 10, 2014. (April 19, 2015) http://www.nytimes.com/2014/11/11/science/dead-jellyfish-are-more-nutrition-than-nuisance.html?ref=topics
- Hendricks, Jonathan R. "Glowing Seashells: Diversity of Fossilized Coloration Patterns on Coral Reef-Associated Cone Snail (Gastropoda: Conidae) Shells from the Neogene of the Dominican Republic." PLoS ONE. Vol. 10, no. 4. April 2015. (April 17, 2015) http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0120924
- Mansfield, Katherine L. et al. "First Satellite Tracks of Neonate Sea Turtles Redefine the 'Lost Years' Oceanic Niche." Proceedings of the Royal Society B. Vol. 281, no. 1781. March 5, 2014. (April 28, 2015) http://rspb.royalsocietypublishing.org/content/281/1781/20133039
- McGee, Georgia E. and Timothy D. Clark. "All Puffed Out: Do Pufferfish Hold Their Breath While Inflated?" Biology Letters. Vol. 10, no.12. December 2014. (April 16, 2015) http://rsbl.royalsocietypublishing.org/content/10/12/20140823
- Metzger, Michael J. et al. "Horizontal Transmission of Clonal Cancer Cells Causes Leukemia in Soft-Shell Clams." Cell. Vol. 161, no. 2. Page 255. April 9, 2015. (April 19, 2015) http://www.cell.com/cell/abstract/S0092-8674%2815%2900243-3
- Milius, Susan. "Baby Fish Are Noisier Than Expected." Science News. Sept. 30, 2014. (April 17, 2015) https://www.sciencenews.org/article/baby-fish-are-noisier-expected
- Putman, Nathan F. and Katherine L. Mansfield. "Direct Evidence of Swimming Demonstrates Active Dispersal in the Sea Turtle 'Lost Years.'" Current Biology. April 9, 2015. (April 15, 2015) http://www.cell.com/current-biology/abstract/S0960-9822(15)00328-0
- Rosen, Julia. "Seals Connect the Dots to Feed in Offshore Wind Farms." Los Angeles Times. July 24, 2014. (April 17, 2015) http://www.latimes.com/science/sciencenow/la-sci-sn-seals-offshore-wind-farms-20140722-story.html
- Russell, Deborah J.F. "Marine Mammals Trace Anthropogenic Structures at Sea." Current Biology. Vol. 24, no. 14. Page R638. July 21, 2014. (April 17, 2015) http://www.cell.com/current-biology/abstract/S0960-9822%2814%2900749-0?_returnURL=http%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982214007490%3Fshowall%3Dtrue
- Saey, Tina Hesman. "Long Before Columbus, Seals Brought Tuberculosis to South America." Science News. Aug. 20, 2014. (April 17, 2015) https://www.sciencenews.org/article/long-columbus-seals-brought-tuberculosis-south-america?mode=magazine&context=189055
- Skwarecki, Beth. "Sea Turtles' 'Lost Years' Transatlantic Journey Mapped for First Time." Scientific American. March 6, 2014. (April 15, 2015) http://www.scientificamerican.com/article/sea-turtles-lost-years-transatlantic-journey-mapped-for-first-time/
- Stromberg, Joseph. "These Carnivorous Plants Glow Under Ultraviolet Light to Attract Prey." Smithsonian.com. Dec. 11, 2013. (April 17, 2015) http://www.smithsonianmag.com/science-nature/these-carnivorous-plants-glow-under-ultraviolet-light-to-attract-prey-180948058/
- Sweetman Andrew K. et al. "Rapid Scavenging of Jellyfish Carcasses Reveals the Importance of Gelatinous Material to Deep-Sea Food Webs." Proceedings of the Royal Society B. Vol. 281. No. 1796. December 2014. http://rspb.royalsocietypublishing.org/content/281/1796/20142210
- Switek, Brian. "A New Use for Blacklights: Finding Dinosaur Feathers." Smithsonian.com. Feb. 24, 2010. (April 17, 2015) http://www.smithsonianmag.com/science-nature/a-new-use-for-blacklights-finding-dinosaur-feathers-64470497/
- Thompson, Helen. "UV Light Reveals Hidden Patterns on Seashell Fossils." Science News. April 3, 2015. (April 17, 2015) https://www.sciencenews.org/blog/science-ticker/uv-light-reveals-hidden-patterns-seashell-fossils
- UNESCO. "Great Barrier Reef." (April 17, 2015) http://whc.unesco.org/en/list/154
- Zielinski, Sarah. "Offshore Wind Farms May Be Seal Feeding Grounds." Science News. July 21, 2014. (April 17, 2015) https://www.sciencenews.org/blog/wild-things/offshore-wind-farms-may-be-seal-feeding-grounds
- Zielinski, Sarah. "That Puffed-Up Pufferfish Isn't Holding Its Breath." Science News. Dec. 8, 2015. (April 16, 2015) https://www.sciencenews.org/blog/wild-things/puffed-pufferfish-isn%E2%80%99t-holding-its-breath
- Zielinski, Sarah. "Tiny Sea Turtles Are Swimmers, Not Drifters." Science News. April 9, 2015. (April 15, 2015) https://www.sciencenews.org/blog/wild-things/tiny-sea-turtles-are-swimmers-not-drifters
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