Showing posts with label jelly. Show all posts
Showing posts with label jelly. Show all posts

Jellyfish are Complex Creatures

Though jellyfish have no brain, intelligence is built into their bodies. They appear to act on instinct to changes in the environment. Whether they have consciousness is not known.
They swim better than any other creature. Swimming against the tide is their forte. Detecting the direction of currents was thought to be impossible without sight, yet jellyfish do it.

Rhythmically moving their heads and forcing water out from their bodies, they are a jet-propelled swimming machine. Most believe that jellyfish just drift. This is not the case, They head straight for their destination, for example, usually in groups.

Somehow they know that there are others of their kind with them, though they do not have eyes. Perhaps the animal uses the Earth's magnetic field as well as ocean currents to know where they are. Some scientists have suggested they use infrasound.
Science by Ty Buchanan
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New Research on Box Jellyfish

There has been a breakthrough in the research on box jellyfish. They have thousands of stinging cells on their ten-foot long tentacles. New discoveries have been made into their evolution. This will help in finding antivenom and new treatment for stings to humans.

Some species of jelly fish have good sight: they have 24 eyes, can sense light and form images of their surroundings. Little is known, however, about what they actually see. They don't need to see to mate. Females and males just get together and fertilize eggs in a mass spawning, though some species do appear to mate one-on-one.

The most dangerous jelly fish, in Australia, is the Box Jellyfish (sea wasp or stinger). Some can immobilize while others can kill. The Portuguese man of war is held to be very dangerous, but despite its name it cannot kill humans. Chironex flecken, an Australian box jellyfish, can be lethal. A similar type, Chironex yamaguchii, has killed people in Japan.

Evolution of jellyfish has been pinned down by DNA extracted from tissue samples. It is now known how species are related. It was found that several types cause Irukandji Syndrome which leaves sufferers with body pain, severe depression and feelings of impending doom. If you are stung by members of this group then these symptoms can be expected. Some types have been isolated from others for a long period of time. Sea level changes from tectonic plate movements apparently create new species.
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