Starfish can see in the dark (and not only)

Date:

2018-02-20 22:00:06

Views:

3255

Rating:

1Like 0Dislike

Share:

Starfish can see in the dark (and not only) Source:

If you're lucky and once you are on the ocean, you will see sea stars. They come in all sizes and colors, but have you ever wondered how it megalopae or multi-armed creature manages to live in the oceans, remaining so different from other animals? In PRSB, a study was published that not only highlighted that starfish have eyes, but found that she could see in the dark. Starfish may seem quite inanimate, like a clam sitting on the bottom of the ocean and absorbing nutrients from the water. But in reality it is not.

the

to See and glow in the dark

Most starfish have a rough eye on the tip of each arrow. These compound eyes contain multiple lenses (ommatidia), each of which generates one pixel of the image, which sees the creature. Tropical sea stars are able to see rough images that allow the animals to stay closer to home.

Scientists have found that some species of deep sea of stars, discovered at a depth of 1 km below the surface, where no sunlight penetrates, can see, despite the darkness. Most of the species that can see in the dark depths of the ocean, have more sensitive eyes, but I see more rude images. These starfish seem to distinguish objects more clearly than their tropical counterparts living in the bright shallows.

Scientists offer different explanations for this. Some species, apparently, can see clearly in the horizontal direction, but less distinctly in the vertical, which is absolutely true for the body, which lies on the seabed. In other species, apparently less able to detect changes that they see over time.

These Two species is also bioluminescent, that is capable of producing short flashes of light on the surface of your body. The combination of these light flashes and the ability to see clearly allows these deep-sea the stars to communicate with potential partners.

the

Regeneration

Hungry predators, crabs or fish can bite off the starfish arrows. If you go to fight, some species of starfish voluntarily lose their limbs to the rest of the body could escape. Moreover, they can regenerate a whole limb. If you find a sea star that has one arrow less than others, it is likely that this is the new limb.

the

sea water

Of the starfish is not the usual set of muscles. Instead, they move with the help of sea water, which is under pressure in the vascular system of their bodies. They draw sea water through the pores, it then passes through internal channels in the limbs, and those already set into motion thousands of the tubular "legs".

Muscles and valves inside each of the tube squeeze the water that allows them to stretch and to get involved, creating a movement as while walking feet, but multiplied hundreds of times. At the end of each tubular leg is a tiny suction Cup which can stick to surfaces and helps the stars to accelerate.

the

the Release of stomach

Sea stars – extremely efficient predators of the sea bottom, feeding on a wide range of products – mussels, clams, oysters. They sneak up on their prey and use the legs to simultaneously capture prey and press it to the bottom of the sea.

If the prey is small enough, the sea star will swallow the whole animal, blowing your stomach, located in the center. Hold position for a deadly grip, starfish will gradually dissolve the edible soft tissues using enzymes inside the stomach and then throw away the inedible hard parts of the shell.

But if the sacrifice is too great to place her in the stomach, the sea star will try first to open the sash shell, and then push your stomach in, so he can destroy the soft tissue in the victim and digest it right in her house, as if sucked through a straw.

The Sea star is amazing!

Recommended

Can genes create the perfect diet for you?

Can genes create the perfect diet for you?

Diet on genotype can be a way out for many, but it still has a lot of questions Don't know what to do to lose weight? DNA tests promise to help you with this. They will be able to develop the most individual diet, because for this they will use the m...

How many extraterrestrial civilizations can exist nearby?

How many extraterrestrial civilizations can exist nearby?

If aliens exist, why don't we "hear" them? In the 12th episode of Cosmos, which aired on December 14, 1980, co-author and host Carl Sagan introduced viewers to the same equation of astronomer Frank Drake. Using it, he calculated the potential number ...

Why does the most poisonous plant in the world cause severe pain?

Why does the most poisonous plant in the world cause severe pain?

The pain caused to humans by the Gimpi-gympie plant can drive him crazy Many people consider Australia a very dangerous place full of poisonous creatures. And this is a perfectly correct idea, because this continent literally wants to kill everyone w...

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Plants colonized Earth for 100 million years earlier than expected

Plants colonized Earth for 100 million years earlier than expected

during the first four billion of its existence, our planet was devoid of any life, except microbes. The situation changed radically at the moment when the Earth began to green up , which created a favorable environment for the col...

SpaceX received permission to launch a very valuable cargo

SpaceX received permission to launch a very valuable cargo

we are Talking about a new space telescope, TESS, permission to run which with the help of rocket Falcon 9, the company Ilona Mask received from the National Directorate of the USA on Aeronautics and space research (NASA). In addi...

Could the Universe be conscious?

Could the Universe be conscious?

Over the past 40 years, scientists gradually opened a strange fact about our Universe: its laws of physics and the initial conditions of the Universe are perfectly tuned in order for life got a chance to develop. It turns out that...

MIT has created a new form of light

MIT has created a new form of light

If you conduct a little experiment and cross the beams of two flashlights, you'll find that nothing happens (unless, of course, except for the increased brightness). The reason is that photons of light do not interact, but rather ...

A person spends a third of life in

A person spends a third of life in "nowhere". Why do we sleep?

Work, friendship, sports, family, food, reading — in the day is clearly not enough time to for all time. To live a full life, many of us carve out precious hours from the time allotted for sleep. Borrow, the next day to pay double...

Modern humans came out of Africa 50 thousand years earlier than previously thought

Modern humans came out of Africa 50 thousand years earlier than previously thought

Israeli archaeologists have discovered the oldest remains of Homo sapiens dated back to the era from 194 to 177 thousand years ago. According to the article published in the journal Science, the discovery is forcing scientists to ...

Chinese geneticists have cloned the first monkey by the method of Dolly the sheep

Chinese geneticists have cloned the first monkey by the method of Dolly the sheep

Chinese biologists first got the healthy young monkeys, which appeared due to the method of transfer of nuclei from somatic cells deprived of its own nucleus the egg. Born young Javanese macaques represent the complete genetic cop...

Microbiologist decoded encoded in the DNA of Bitcoin

Microbiologist decoded encoded in the DNA of Bitcoin

In early 2015 Professor Nick Goldman of the European bioinformatics Institute have developed a new method of storing digital information in DNA. In his speech at the world economic forum he told the audience about it, and then ask...

Playing God: the man-made climate change will lead to global catastrophe

Playing God: the man-made climate change will lead to global catastrophe

using computer modeling scientists have shown how dangerous can be artificial regulation of Earth's climate using geoengineering technologies. The results of a study published in the journal Nature Ecology & Evolution, saying...

Big asteroid killed the dinosaurs. And what of the smaller asteroid?

Big asteroid killed the dinosaurs. And what of the smaller asteroid?

this month, close to the Ground flew a relatively small asteroid, which was discovered, within six days before. Sounds scary, but the fact is that a possible collision of this object with the Earth — an extremely unlikely event. E...

Scientists have taken a big step in the development of the technology of levitation of the human

Scientists have taken a big step in the development of the technology of levitation of the human

Acoustic tractor beams use the power of sound to capture particles in the air and, in contrast to the same magnetic levitation technology, capable of capturing most of the liquids and solids. Engineers at the University of Bristol...

Projections for global warming become more accurate

Projections for global warming become more accurate

If "one" is the loneliest number, two is the worst. Mankind must not allow the global temperature rise to 2 degrees Celsius, says the Paris climate agreement. Intersection of this line will mean disaster. A particular problem in t...

NASA and Boeing are jointly developing the aircraft with a folding wing

NASA and Boeing are jointly developing the aircraft with a folding wing

Experts controlled by Boeing and NASA project Adaptive Spanwise Wing has developed a special alloy, which you can use to make easy foldable wings. the Idea of creating a flexible wing is not new, but developers who tried to do s...

To infect someone with the flu, you don't even need to sneeze and cough

To infect someone with the flu, you don't even need to sneeze and cough

we All know that the flu virus is spread by airborne droplets. This can be directly, when a sick person coughed or sneezed, and standing next to healthy people inhaled the virus-containing air through a spray or drops produced by ...

African arrow poison could become a male contraceptive

African arrow poison could become a male contraceptive

researchers from the universities of Minnesota and Kansas believe that the substance is ouabain could be the basis for pharmacological male contraception. Ouabain contained in the leaves, roots and stems of one of the shrubs growi...

Astronomers have created a complete topology map of one of Saturn's moons

Astronomers have created a complete topology map of one of Saturn's moons

it took more than ten years from the moment the spacecraft Cassini has transmitted the first clear images of Titan, the largest moon of the planet Saturn. Astronomers have spent years to analyze all the data provided by the camera...

DNA of someone who died in 1827, restored without his remains

DNA of someone who died in 1827, restored without his remains

recreate the DNA of a deceased person or animal, usually requires extraction of the DNA from the remains. A new study shows that this is not the only way. DNA of a man who died about 200 years ago, was restored from his living des...

Study: computer games do not hurt the psyche

Study: computer games do not hurt the psyche

Computer games do not make people more prone to violence. That is the conclusion of British psychologists in the article of the journal Entertainment Computing. Discussion on the benefits and harms of computer games, their influen...

Prediction of crime AI

Prediction of crime AI "fired"

the Algorithm Compas, who worked for the American police since 1998, was engaged in the analysis of data from defendants, and then, on the basis of the information received helped to solve, for example, whether to release the offe...

Scientists have found that fast food affects the body such as infection

Scientists have found that fast food affects the body such as infection

About the harm it was written so much to read the data in scientific papers is possible for weeks on end. However, many people can not overcome their weaknesses and regularly buy burgers, fries and other "harmful snacks" in your f...