Weird sea creatures discovered in Antarctic

(Livescience.com) 

Scientists doing their first exploring of deep-sea vents in the Antarctic have uncovered a  world unlike anything found around other hydrothermal vents, one populated by new species of anemones, predatory sea stars, and piles of hairy-chested yeti crabs.

It was "almost like a sight from another planet," said expedition leader Alex Rogers, a professor of zoology at Oxford University. 

Even in the eye-popping world of deep-sea vents, the Antarctic discoveries stand out, with the unfamiliar species of crabs found crowded in piles around the warm waters emanating from the seafloor. Many of the animals found at the vents have never been found at hydrothermal vents in other oceans, Rogers said. "To see these animals in such huge densities was just amazing," Rogers told LiveScience.

In the dayless world of deep-sea vents, energy comes not from the sun but from the hydrothermal energy generated in the oceanic crust.

The yeti crabs seem to cultivate "gardens" of bacteria on their chests, which are covered with hairy tendrils. These bacterial mats almost certainly provides the crabs with sustenance, Rogers said. In turn, predatory seven-armed sea stars stalk the periphery of the vents, snacking on unfortunate crabs. [See video and photos from the vents]

"We were absolutely stunned to see the animal communities, because they were so different from the hydrothermal vents seen elsewhere," Rogers told LiveScience. He and his colleagues reported their results Jan. 3 in the journal PLoS Biology.

Discovery in the deep sea

Weird life flourishes at deep-sea vents the world over, but no one had ever found hydrothermal vents in Antarctica, explained Jon Copley, a professor of earth and ocean science at the University of Southampton who also participated in the research. That's largely because it's more difficult to do research in the harsh Southern Ocean than in temperate climes. [Extremophiles: World's Weirdest Life]

"It's only quite recently that we've been able to be bold enough, really, to head to the poles," Copley told LiveScience.

In 1999, Antarctic mapping surveys turned up hints of hydrothermal vent output in the water column over the East Scotia Ridge in the Atlantic section of the Southern Ocean, between Antarctica and South America and eastward. It took 10 years for researchers to get back for a full-blown expedition, during which they lowered cameras to two areas, 8,530 feet (2,600 meters) and 7,874 feet (2,400 m) deep, catching the first glimpses of Antarctic hydrothermal vents. Among them were "black smokers," chimney-like vents that emit dark-hued, superheated water.

Although the background temperature of the Southern Ocean in the area is 32 degrees Fahrenheit (0 degrees Celsius), the black smokers gushed water as hot as 721 degrees F (382 degrees C).

In 2010, the researchers returned with a remote-operated submersible vehicle (ROV) called Isis. The sub took close-up photos of the amazing vent fauna and collected samples of organisms for identification.

New world

Among the new species were the yeti crabs, crowded around the vents up to 600 per square meter.

"They're literally, in places, heaped up upon each other," Rogers said. Crabs normally don't tolerate cold temperatures well, so the vents may be a warm haven for these crabs, Copley said.

Unlike vents in other oceans, the Antarctic vents lack tube worms, mussels and shrimp. Instead they harbor new species of barnacles and anemones, as well as a large brown spiral-shelled snail. The researchers even saw ghost-pale octopuses, which seemed drawn to the lights of the ROV.

"We were completely blown away by what we found," Copley said. "I've worked at vents in the Atlantic, the Pacific and the Indian Ocean, but these are the lushest, richest vents, in terms of life, that I've come across."

The discovery helps fill a gap in researchers' understanding of how deep-sea life disperses around the oceans, Rogers said. They had expected that the Southern Ocean would be a historical gateway for vent species to travel between the Atlantic, Pacific and Indian oceans, and there do seem to be some species, such as the yeti crab, that are related to species found at other vents. Those relationships seem to reach back into geological history, Copley said, when there was a connection between the Antarctic and the eastern Pacific.

But the vast differences between Antarctic vents and vents found elsewhere suggest that the area is not a gateway but a biological region in its own right, Rogers said. The cold Antarctic waters may act as a barrier to species that start their lives as swimming, feeding larvae, he said. On the other hand, larvae that carry their own food supply with them in eggs — known as lecithotrophic larvae — may be able to survive and disperse in the chilly Southern Ocean.

As humans increasingly exploit the deep seas for fish, oil and mining, understanding how species are dispersed is crucial, Copley said.

"Until we understand what governs the patterns of life at deep-sea vents, how interconnected their populations, how well life disperses from vent to vent, we can't make responsible decisions about how to manage these deep-ocean resources."

In Photos: Spooky Deep-Sea Creatures
Extreme Life on Earth: 8 Bizarre Creatures
Dangers in the Deep: 10 Scariest Sea Creatures

[notyrants]

Except for the star fish, it's the garden of Eden for the crab...hungry? just pluck some food from chest your hairs.

[AOCGUY]

From the masthead I thought this was another story about the GOP Primary season.

[flexsf]

Definitely not the GOP. These are intelligent life forms, but the GOP doesn't give a damn about these creatures, and they don't care if they're wiped off of the earth by an oil company. The GOP is only interested in winning elections and obtaining as much wealth as possible.

[Wizstars]

Weird sea creatures? Hairy-chested yeti crabs? are you sure this wasn't where the Bachmann campaign went to die?

[th9876]

We don't need to "manage" it, we need to leave it alone -- but alas, humans just can't seem to stop destroying things.

[TellitTrue]

1) It's too late already to "leave it alone." We don't know that pollution or bacteria off of the submersible itself haven't already altered the colony.

2) What if one of the newly-discovered organisms contains or produces a substance that cures cancer? Should we let people continue to die so we don't disturb the colony?

[ToolMangler1]

by TellitTrue January 4, 2012 4:54 PM EST


(1)(2)........ = ........... Thats life!!!! Nothing but one "what if" after another...
Besides, Maybe it was never meant for them to remain 'static'.... We didn't create them, you know!!!!

[venusvegasvada]

Hmmm, pretty cool.

Offhand, it looks like the Crab to Star ratio is about 99 to 1...

(Sorry, I couldn't resist...)

[ici2i]

"...we can't make responsible decisions about how to manage these deep-ocean resources."

What an odd and somewhat arrogant thing to say! Manage? Explore & understand OK but why do they need to be managed? Protected and studied yes but managing these ecosystems is not for humans to be involved with because exploitation and / or loving to death is our typical management result.

[enlightenu]

management means protection from exploitation

[th9876]

Really enlightened one? Have you ever heard of the term "wildlife management", which is basically hunting. I'm afraid this "new" find is going to be its doom.

[jose_z1]

they look like big white ticks.
.
.

[OmegaWolf747]

I think these creatures must be as weird and wonderful as anything we might find in space. In our zeal to explore other galaxies, let's not forget the inner space of the oceans.