New Revelations of Sea Animals' World

Scientists in California's Monterey Bay turn up two remarkable discoveries. One is a sea squirt that creates a net of mucous hundreds of times its body size to catch food. The second discovery is a new species of jellyfish that uses something extremely rare — a red fluorescent light — to draw and capture fish.

Copyright © 2005 NPR. For personal, noncommercial use only. See Terms of Use. For other uses, prior permission required.

MICHELE NORRIS, host:

Scientists studying the ocean tend to look near the surface or at the sea bottom. What lies in between, the vast midwaters, have barely been explored. That's why scientists keep finding surprises there. NPR's Christopher Joyce tells us about two new discoveries made off the coast of California in Monterey Bay.

CHRISTOPHER JOYCE reporting:

For a long time, the best scientists could do to find out what lived in the deep ocean was to look in fishing nets or along beaches for animal corpses. Anything delicate, like the jellyfish, wasn't likely to make it that far. Then robot submarines came along, and now scientists are awash in bizarre animals, such as siphonophores. These are like jellyfish, but long and skinny. Marine biologist Steven Haddock says you can think of a siphonophore as one animal or a colony.

Mr. STEVEN HADDOCK (Marine Biologist): The siphonophore, itself, is a strange organism. It has sort of like a tube. And hanging down from that tube are a series of stomachs and tentacles and reproductive structures in this repeating series all along the chain, so they grow just by adding those units.

JOYCE: Some species keep adding units until they're over a hundred feet long.

Mr. HADDOCK: You know, it's only the size of a broom handle around, but it just stretches on and on and on, and it just keeps going and going, and they're the ones that have these tentacles maybe hang out for a meter or two down below, and so they form this curtain.

JOYCE: A drifting curtain of six-foot-long deadly tentacles. The species Haddock found was somewhat shorter, only about two feet. But size isn't the point here. It's chemistry. Haddock noticed that attached to some tentacles was a glowing red bulb, something like a lure.

Mr. HADDOCK: It's almost like a Tootsie Pop. There's a stalk. And suspended at the end of the stalk is this lure, and it glows red.

JOYCE: Lots of jellyfish glow with a blue or green light when provoked; it's a form of chemically created luminescence, and usually serves as a warning. But red light is extremely rare in sea creatures. Haddock suspects some fish in the deep sea may be lured by the red light and to the siphonophore's tentacles. Haddock's expedition by the Monterey Bay Aquarium Research Institute is described in the journal Science.

Another recent Science paper appears to solve a long-standing mystery about carbon in the deep sea. It also came about from an expedition by institute scientists. They were looking at larvaceans. They're two-inch-long sea squirts that drift through the deep sea inside a sort of house, each one built out of mucus. Biologist Kim Reisenbichler says the weblike house is a strange sight drifting into the beam of an underwater spotlight.

Mr. KIM REISENBICHLER (Biologist): I guess a sort of almost a transparent hot-air balloon with particles stuck on the side of it: small pieces of marine snow, fecal pellets. Small critters also live on it.

JOYCE: Scientists knew about these animals, but didn't realize how many there were until they started counting the dead ones.

Mr. REISENBICHLER: We'd see them all the way to the bottom, and then going to the bottom, we would see them lying on the bottom, hanging on the canyon walls at densities as high as one per meter.

JOYCE: And here's the mystery part. Microscopic animals on the seafloor depend on carbon. Most comes from marine snow: dead animals and fecal material that rain down from above. But scientists have measured marine snow, and there isn't enough to explain all the carbon on the bottom. So where was the extra coming from? Apparently from innumerable dead sea squirts drifting down to hungry mouths on the seafloor. Christopher Joyce, NPR News.

ROBERT SIEGEL (Host): You're listening to ALL THINGS CONSIDERED from NPR News.

Copyright © 2005 NPR. All rights reserved. No quotes from the materials contained herein may be used in any media without attribution to NPR. This transcript is provided for personal, noncommercial use only, pursuant to our Terms of Use. Any other use requires NPR's prior permission. Visit our permissions page for further information.

NPR transcripts are created on a rush deadline by a contractor for NPR, and accuracy and availability may vary. This text may not be in its final form and may be updated or revised in the future. Please be aware that the authoritative record of NPR's programming is the audio.

Comments

 

Please keep your community civil. All comments must follow the NPR.org Community rules and terms of use, and will be moderated prior to posting. NPR reserves the right to use the comments we receive, in whole or in part, and to use the commenter's name and location, in any medium. See also the Terms of Use, Privacy Policy and Community FAQ.