A person’s first thought of a giant squid might be the bloodthirsty behemoth that attacks seafarers in 20,000 Leagues Under the Sea. But the animal’s reputation is a little over-inflated—the giant squid discovered last year might have been just a docile blob.
A New Zealand boat fishing in the Antarctic brought in the 1,000-pound female squid, and scientists have been studying the sea creature over the last year. But looking at its biology, they found that it’s unlikely the animal was a great ocean predator. Rather, the female squid bore quite a mother’s burden; the thousands of eggs she carried caused her to expand into a big blob as she got older, says marine biologist Steve O’Shea.
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Viruses, those strange, quasi-alive chunks of genetic material, are usually bad news for the cells that they invade. A virus uses its host’s genetic machinery to replicate itself, often sickening or destroying the host in the process. But scientists might have found helpful viruses deep in the ocean, in one of the world’s oddest ecosystems.
Eric Wommack from the University of Delaware was studying the hot waters around hydrothermal vents in the Pacific Ocean when he found that viruses there, rather than replicating and destroying their hosts, often just hang around and cause no harm. When its bacterial host finds itself under stress, the virus comes alive. But while going about its business of replicating itself, the virus can interact and exchange DNA with the bacterium.
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Yesterday we wondered whether the U.S. Navy’s plan to intentionally sink some of its old warships, so that they’d become new homes for fish and attractions for recreational divers, would be such a great idea in the long run. Today, a new study looking at a different shipwreck suggests that not only might intentionally sinking old ships be a bad idea, but officials might have to remove shipwrecks from sensitive ecosystems before they cause too much harm.
Back in 1991, a 100-foot-long ship sank in Palmyra Atoll National Wildlife Refuge near Hawaii. Now, 17 years later, scientists studying the area say the coral reef is under attack by an organism called Rhodactis howesii. It is a corallimorph, a relative to anemones and corals that clears out competitors with it stinging tentacles. Rhodactis is an invasive species to the Palmyra Atoll, and it doubled its presence between 2006 and 2007, pushing out the diverse mix of corals that is native there.
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Have you ever seen those aquarium ornaments that look like shipwrecks? Well, the U.S. Navy is applying that idea in real life.
In 2006, the Navy intentionally sank one of its old boats off the coast of Pensacola, Fla. The U.S.S. Oriskany, which had served in the Korean and Vietnam wars and launched the last bombing mission of Sen. John McCain, became an “artificial reef.” The Navy has 59 decommissioned ships sitting around and nothing to do with them—while most will become scraps, some might become reefs. But is sinking more old ships really a good idea?
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It’s been a weird summer in the waters off Great Britain.
First, in June, 26 dolphins washed up on the shores of Cornwall; that produced a number of possible explanations, including the idea that U.K. Navy war games in the area had frightened the marine mammals. Then a British study concluded that most of the dolphins, whales, and porpoises that died in U.K. waters were killed when they got caught in trawler fishing nets. But now, Nature has uncovered a 2007 report by the U.K. military that says sonar can change the behavior of whales in the sea.
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British police are on the lookout for aquatic abductors who stole a female marble catshark from a private aquarium in Hampshire earlier this week.
The two-foot-long shark and its male partner are the only known breeding partners or marble catsharks in Britain. The police think this may have been a targeted burglary, but one that took a plenty of planning. The fish thieves would have needed a net to catch the shark, a bag to put it in, a box to carry it in, and knowledge of the building’s layout—meaning there was either an inside man, or the burglars liked to visit the aquarium.
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According to Peter Rona from Rutgers University, there might be something unusual going on a mile beneath the surface of Lake Baikal—An ocean being born.
To take a peek, Russian scientists have gone all the way to the bottom of Baikal. Anatoly Sagalevich, Artur Chilingarov, and others boarded MIR 1 and MIR 2, submersible vessels that could carry them a mile below the surface. (Director James Cameron used the same vehicles to film the wreckage of the Titanic for his film; last year MIR 1 and 2 carried Russian scientists to the sea floor beneath the North Pole.)
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Hurricane Dolly caused plenty of misfortune, as downpours and flooding forced hundreds of people from their homes in Texas and New Mexico. But if there’s any kind of positive side to a natural disaster, it could be that Dolly might have decreased the size of the Gulf of Mexico’s dead zone.
The dead zone starts near the Mississippi River delta and extends toward the Texas coast. Nutrients like nitrogen and phosphorus wash into the river via runoff and are carried to the gulf, where their decomposition uses up oxygen. Also, the river’s freshwater and the gulf’s saltwater don’t mix well and tend to form layers, which can keep oxygen from getting to the bottom of the gulf. That creates the dead zone—an area of low-oxygen water where most marine creatures can’t live.
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Earlier this month, DISCOVER covered the North Pacific Gyre, a vast dump of plastic and garbage in the middle of the Pacific Ocean, and the researchers who sailed to the middle of the ocean aboard the Alguita to study it. Now, to further publicize this eco-disaster, three scientists are sailing back to the gyre, but this time aboard a slightly less luxurious boat—a raft built of 15,000 plastic bottles, and part of a Cessna.
The JUNK raft set sail from Southern California on June 1, bound for Hawaii, carrying Marcus Eriksen and two colleagues. You can watch their progress here or read about it on their blog. Making a pace of about 50 miles a day, they hope to reach Hawaii by mid-to-late August.
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Perhaps Lonesome George should now be called Curious George.
The giant Galapagos tortoise earned his moniker by keeping to himself for most of his 36 years of captivity at the Charles Darwin Research Station. Now, all of the sudden, George appears to have broken out of his solitude and mated with one of the two females at the station that come from a similar species of Galapagos tortoise.
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