Navigation Links
Eyes of rock let chitons see predators
Date:4/14/2011

appeared 20 centimeters above the chitons.

When shown the gray screens, the chitons did not respond. But they clamped down when shown a black disk three centimeters or larger in diameter. That would be the equivalent of humans looking in the sky and seeing a disk the diameter of 20 moons, making human vision about a thousand times sharper than chiton vision, Johnsen said.

Because the chitons responded to the larger disks and not the gray slides, they seem to be seeing the disk and not simply responding to a change in light, said University of Sussex biologist Michael Land, an expert on animal vision who was not involved in the research. It's not yet clear if they respond only to the removal of light by the disk as opposed to added light.

Land also said it's not likely that the chitons' eyes were part of the evolutionary route to human eyes.

Chitons are an ancient, primitive species that first appeared on Earth more than 500 million years ago. But the oldest chitons with eyes only began to appear in the fossil record in the last 25 million years, making their eyes among the most recent to evolve in animals. Speiser said chitons probably evolved to have eyes with lenses so they could see their predators and defend themselves against being eaten.

Speiser and his colleagues also tested whether the chitons' eyes work in both air and water, since some species spend time in both. The experiments made a strong case for the chiton lens being able to focus light differently, depending on whether the animal is above or below water, Land said.

He added that chiton eyes are still an anomaly in the evolution of vision. The retinas are structurally similar to snail and slug retinas. But snail and slug retinas respond to the appearance of light, while chiton retinas may only respond to the removal of light, a difference that might be worth another look, Land said.


'/>"/>

Contact: Gail Gallessich
gail.g@ia.ucsb.edu
805-893-7220
University of California - Santa Barbara
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Hind wings help butterflies make swift turns to evade predators, study finds
2. As super-predators, humans reshape their prey at super-natural speeds
3. Sexy or repulsive? Butterfly wings can be both to mates and predators
4. Predators ignore peculiar prey
5. Siberian jays use complex communication to mob predators
6. Venomous sea snakes play heads or tails with their predators
7. Lizards change their diet to avoid predators
8. Move over predators: Plants can control the food chain too -- from the bottom up
9. Return of top predators is key to ecological future
10. Making its predators tremble: Multiple defenses act synergistically in aspen
11. Cycad pest uses small size to hide from predators
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Eyes of rock let chitons see predators 
(Date:7/24/2014)... wildlife loss leads to conflict among people around the ... Society (WCS) Health & Ecosystems: Analysis of Linkages (HEAL) ... approach to tackle global biodiversity decline. , The harvest ... world,s people and provides protein for more than a ... no surprise that today,s unprecedented loss of wildlife, is ...
(Date:7/24/2014)... Bushmeat, the use of native animal species for food ... be a significant factor in the decline of many ... new study indicates that more than half of the ... raptors and hornbills., "By surveying not only the meat ... being eaten inside the forest by hunters and brought ...
(Date:7/24/2014)... Angeles, where electric cars ply silent freeways, solar panels ... beneath the earth, from howling winds and from the ... that it is technically and economically feasible to convert ... renewable energy. Published in Energy , the plan ... energy supply in California that could create tens of ...
Breaking Biology News(10 mins):New study draws links between wildlife loss and social conflicts 2Stanford study shows how to power California with wind, water and sun 2Stanford study shows how to power California with wind, water and sun 3Stanford study shows how to power California with wind, water and sun 4
... French . Some of the human X chromosome ... Africa, according to an international team of researchers led by ... of Montreal and the CHU Sainte-Justine Research Center. The research ... and Evolution. "This confirms recent findings suggesting ...
... July 18, 2011 Researchers at UT Southwestern Medical ... involved in the formation of colon cancer, far more ... study, published in the July 2011 Cancer Research (Priority ... cancer treatments targeting multiple genes and pathways simultaneously. Current ...
... YORK, July 16, 2011 Experts from the Center ... Center will present new research at the 2011 Alzheimer,s ... in Paris, France from July 16 21. ... impairment in retired football players, with Stella Karantzoulis, PhD, ...
Cached Biology News:Genetic research confirms that non-Africans are part Neanderthal 2NYU Langone Medical Center's tip sheet to the 2011 Alzheimer's Association International Conference 2NYU Langone Medical Center's tip sheet to the 2011 Alzheimer's Association International Conference 3NYU Langone Medical Center's tip sheet to the 2011 Alzheimer's Association International Conference 4NYU Langone Medical Center's tip sheet to the 2011 Alzheimer's Association International Conference 5NYU Langone Medical Center's tip sheet to the 2011 Alzheimer's Association International Conference 6
(Date:7/24/2014)... processes prefer to settle into equilibriuma state of ... the realm of non-equilibrium conditions where new possibilities ... and phases, such as temperature fluctuations, freezing and ... regulate their body temperature, airplanes to fly, and ... , But even though these conditions exist naturally ...
(Date:7/24/2014)... N.J. , July 24, 2014  CorMedix ... on developing and commercializing therapeutic products for the ... today announces receipt of notice on July 18, ... the NYSE-MKT has accepted the CorMedix plan to ... NYSE-MKT. As a result, the NYSE-MKT is continuing ...
(Date:7/24/2014)... 1000 balances – 4 steps – One Recommendation: the ... expertly narrows down the mass of product choices to ... , First, select the working environment, then enter ... and define the accuracy – it’s really that simple. ... list to models that fit best with the customer’s ...
(Date:7/24/2014)... As part of the long-term strategic approach, ... region during 2014 with potential global expansion. , "We ... DZS to manage our clinical trials globally and in ... R&D and President of SBI pharmaceuticals MENA, Dr. Riyadh ... a focus on utilizing eClinical software and flexible team ...
Breaking Biology Technology:New approach to form non-equilibrium structures 2CorMedix, Inc. Granted Extension of NYSE-MKT Listing 2CorMedix, Inc. Granted Extension of NYSE-MKT Listing 3SBI Pharmaceuticals Co. Ltd. Enters into Preferred Provider Agreement with DZS Clinical Services 2
... Oct. 23 BioWisdom Ltd (BioWisdom),the market ... industry, today announces the release of OmniViz,Visualization ... are increasingly being used in competitive business ... business decisions.,OmniViz Visualization Software can turn the ...
... Israel and JERSEY CITY, New Jersey, October 23, ... in,the development of microRNA-based diagnostics and therapeutics, today,announced ... Annual,Meeting on "Molecular Markers in Cancer". The event ... in Hollywood, Florida., The poster presentation, titled ...
... FRANCISCO, Calif., Oct. 23 Poniard,Pharmaceuticals, Inc. (Nasdaq: ... today announced that it will hold a conference ... provide a corporate update,including an update on the ... candidate., Jerry McMahon, Ph.D., chairman and chief ...
Cached Biology Technology:Rosetta Genomics to Present at the Upcoming EORTC-NCI-ASCO Annual Meeting on "Molecular Markers in Cancer" 2Rosetta Genomics to Present at the Upcoming EORTC-NCI-ASCO Annual Meeting on "Molecular Markers in Cancer" 3Poniard Pharmaceuticals to Host Third Quarter 2008 Financial Results Conference Call on October 30 2
For removal of the zona pellucida. Sterile, Mouse Embryo tested...
... The LXQ linear ion trap mass spectrometer ... analytical laboratory., The LXQ linear ion trap ... and proteomic applications, delivering the fast cycle ... linear ion trap at an attractive price. ...
... scientists who do not have access to microarray ... their biological samples tested for the concentration of ... 1-2-3 Chose the analytes you wish ... S&S antibody menu. Send your samples to ...
... Persistent Analysis Environment 2) Dot plot, ... 3) Software Compensation 4) Cell Cycle ... Platform 7) Intelligent batch generation of graphs ... 9) Single drag-and-drop operations to perform complex ...
Biology Products: