You can't tell from the photo, but this jellyfish is huge. Nomura jellyfish, native to the waters off China and Japan, can grow to be the size of a refrigerator, and weigh up to 400 pounds. And, since the 1990s, there's a lot more of them. Swarms, 500 million jellies strong, have sunk ships, writes Brandon Keim in Wired. It's part of a global increase in jellyfish populations. Right now, nobody's sure whether this is a blip, or a new normal. But everybody would like to know how jellyfish affect ecosystems, and new research offers some sobering analysis.
In what may be the most comprehensive jellyfish study to date, Condon's group spent nearly four years gathering data from Chesapeake Bay on Mnemiopsis leidyi and Chrysaora quinquecirrha, two species that have caused trouble elsewhere and are considered representative of jellyfish habits worldwide.
The researchers counted them at sea, measured the nutrients in surrounding water, and calculated the composition of nearby bacterial communities. In the lab, they observed how bacteria in seawater reacted to jellyfish, and tracked chemicals flowing through their aquariums.
They found that jellyfish, like many other marine species, excrete organic compounds as bodily wastes and as slime that covers their bodies. But whereas the excretions of other species are consumed by bacteria that form important parts of oceanic food webs, jellyfish excretions nourish gammaproteobacteria, a class of microbes that little else in the ocean likes to eat, and that produces little of further biological use.
"Lots of marine creatures make this dissolved organic matter that bacteria use to live. But the point of this paper is that the organic matter produced by jellies doesn't make it back up the food web," said study co-author Deborah Steinberg, also a Virginia Institute of Marine Science biologist. "When jellies are around, they're shunting this energy into a form that's just not very usable. They're just shunting energy away from the rest of the food web."
Nomura jellyfish photo by KENPEI, used via CC
Artists Jeff Louviere and Vanessa Brown explore cymatics, the study of wave phenomena and how they are represented visually. Using black-colored water, a laptop computer, and a modified guitar amp, they captured “portraits” of the 12 notes in the chromatic scale. From my sister-in-law Heather Sparks’s profile of their project in Nautilus: In each (“portrait”), […]
Yesterday’s science-by-press-release announcement that a research team had made a “breakthrough” in treating ALS thanks to funds raised in last year’s viral ice-bucket challenge turns out to be vaporware: the gene identified was already known to be implicated in ALS, but only affects 3% of cases, and the new refinement in the research suggests some […]
New research on trends in adult human height over the last century confirm that, no surprise, humans are getting taller overall due to better nutrition and disease control. However according to the health science group Non-Communicable Diseases Risk Factor Collaboration (NCD-RisC), the gain in adult height varies dramatically by country. From their paper, published in […]
Looks like all of your potential employers are hiring candidates with programming skills (which you don’t have). With all of the languages out there today, it’s tough to know where to start.With the Complete Front-End to Back-End Coding Bundle, you can beef your resume up in all the right places, no confusion necessary. This package of […]
Those of us who love music wish we could listen to it 24/7. But it’s impossible when we’re trying to converse with our friends, or when are swimming in the local pool.That is, until now. The KOAR Bone Conduction Bluetooth Headset, now 48% off, has changed the audio game.Made with lightweight titanium memory metal, this headset boasts patented bone conduction technology to transport sound […]
It’s one thing to enjoy dinner at home and a nice glass of Cabernet Sauvignon with your best friend, Netflix, but it’s another thing entirely to make that meal from scratch and get that wine delivered right to your doorstep.But what if we told you there’s a way to make this possible? To keep your social life, […]