Seabed Abysmal: mysteries z35W7z4v9z8w

Spectacular abyssal creatures of the sea .Discover deep ocean creatures.

Showing posts with label mysteries. Show all posts
Showing posts with label mysteries. Show all posts

February 10, 2012

Alien Artifact Found in Chalk at Avebury 2012



Ninety million years ago the chalk downland of Northern Europe was ooze accumulating at the bottom of a great sea. Protozoans such as foraminifera lived on the marine debris that showered down from the upper layers of the ocean.

Their shells were made of calcite extracted from the rich sea-water. As they died a deep layer gradually built up and eventually, through the weight of overlying sediments, became consolidated into rock. Later earth movements related to the formation of the Alps raised these former sea-floor deposits above sea leve

'Supergiant' amphipod discovered in deep sea near New Zealand

There are ordinary amphipods, known to be mostly tiny shrimp-like crustaceans that thrive in aquatic environments around the world, and now there are "supergiant" amphipods, which are 10 times larger and, frankly, quite freakish-looking



British scientists made the remarkable discovery by accident while participating in a joint expedition with New Zealand scientists to probe the depths of the Kermadec Trench, north of New Zealand.

Using a large metal trap outfitted with cameras, they'd hoped to haul up a species of deep-sea snailfish that had not been captured in more than 60 years. Instead they hauled up, from nearly 33,000 feet below, seven milky-white amphipods measuring to about 11 inches, or the size of small lobsters. (Ordinary amphipods barely exceed 1 inch.)

Dr. Alan Jamieson, from the University of Aberdeen's Oceanlab, said on the facility's website, "The moment the traps came on deck we were elated at the sight of the snailfish as we have been after these fish for years.

However, seconds later, I stopped and thought, 'What on earth is that?' It's a bit like finding a foot-long cockroach.

The mysterious find was not totally unprecedented. The term 'supergiant' was used by American scientists who hauled up unusually large amphipods off Hawaii in the 1980s.

Ghostly Yeti Crab Swarms Discovered Near Antarctica

For the first time, scientists have observed and filmed animals, including a fuzzy new species of crab, swarming hot volcanic vents near Antarctica. The ghostlike crabs feed on bacteria that live off minerals spewed from the hydrothermal vents.

Unusual and Weird Deep Sea Creatures 2012

February 6, 2012

The mysterious secret of the Argonauts

                                    

Since ancient biologists have wondered why, among all octopuses, only one, the female Argonaut, is able to generate around a thin spiral shell. So fragile (to the point of being called "paper nautilus"), which serves to protect themselves from predators. And so light that allows the animal to float weightless on the fence.

                      

For centuries, given that female Argonaut put and keep their eggs inside the shell, it was thought that, offering a sort of nest for their offspring, was precisely the main function of the curious structure.

A study by Australian biologists and published in the Journal of the Royal Society discovered the truth: the main function of the shell of the Argonauts is to allow the animal to ascend and descend in the water at will, thanks to "air capsules" ably used to regulate the depth without making any physical effort.

Which puts an end to long speculations on the role of those curious air bags, which many considered responsible for the octopus floating and drifting uncontrollably to be stranded on the beaches half a world. But biologists say the study shows that the air inside the shells of female Argonaut is not only beneficial for them, but essential for survival.

Indeed, thanks to these bags the Argonauts can choose exactly how deep they want to be by the simple method of "adjusting" the amount of air which absorb on the surface. A mechanism that gives them a great advantage over other octopuses, which to scroll up and down need to use a lot of muscle power.

The Argonaut, however, uses a kind of jet to descend effortlessly. As low (up to 750 m depth), increasing water pressure is reduced the volume of air within the shell, reaching an equilibrium in which the animal's weight and it vanishes just remains floating in a state similar to weightlessness.

Researchers believe that this extraordinary ability had remained hidden until now due to the fact that most previous studies have been conducted in aquariums, too shallow to allow the octopus to demonstrate their skills.

Despite its resemblance to the nautilus, another cephalopod with which he is often confused, the Argonaut is a real octopus with eight tentacles equipped with suckers around its central mouth. There are four known species live in temperate and tropical waters and is an important food source for whales, seals, fish and seabirds.

Females can grow to 50 cm and are able to make their shells, calcium carbonate secreting two bodies, similar to those spiders to spin off its cloth, placed in two of its tentacles. Males are much smaller, barely two inches, and can not make shells.

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