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

(Santa Barbara, Calif.) Using eyes made of a calcium carbonate crystal, a simple mollusk may have evolved enough vision to spot potential predators, scientists say.

Daniel Speiser, a postdoctoral fellow in the Department of Ecology Evolution and Marine Biology at UC Santa Barbara, studied mollusks that he collected in the Florida Keys. His research of their vision, performed during his graduate studies at Duke University, resulted in a study published today by Current Biology.

The three-inch-long mollusks, called chitons, have hundreds of eye-like structures with lenses made of aragonite, a type of rock. It's the first time scientists have found an animal that makes eye lenses from aragonite and not the rock's close cousin, calcite.

Scientists discovered the chiton's unique eyes decades ago. But it wasn't clear whether chitons used these eyes to see objects overhead, or simply to sense changes in light. "Turns out they can see objects, though probably not well," said Speiser.

"It's surprising how these creatures make their eyes from rocks," said Snke Johnsen, associate professor of biology at Duke. Most animals make their eyes from cells with proteins and chitin. "But it seems like an easy way to evolve eyes, by using what you've already got," he said. Chitons also make their shells from aragonite.

Johnsen and Speiser studied West Indian fuzzy chitons, or Acanthopleura granulata, which have flat shells made of eight separate plates. Hundreds of tiny lenses on the surface of the plates cover clusters of light-sensitive cells beneath.

To test the creature's vision, Speiser placed individual chitons on a slate slab. When left undisturbed, they lift part of their armored, oval-shaped body to breathe. At this point, Speiser showed them either a black disk ranging from .35 centimeters to 10 centimeters in diameter or a corresponding gray slide that blocked the same amount of light. The disk or slide
'/>"/>

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:12/15/2014)... DUBLIN , Dec. 12, 2014 Research and Markets ... of the "Global Facial Recognition Market 2015-2019" ... http://photos.prnewswire.com/prnh/20130307/600769 Facial recognition is a technology ... measures the overall facial feature of a person such ...
(Date:12/11/2014)... , Dec. 10, 2014  Data Sciences International (DSI), ... released a new series of digital telemetry implants ... researchers. M series, part of the PhysioTel™ Digital ... best possible physiologic data when incorporating functional endpoints ...
(Date:12/10/2014)... San Diego has launched an innovative trust network and collaboration ... among social service and care providers by enabling them to ... from the Alliance Healthcare Foundation to expand to organizations serving ... "Live Well San Diego" partner on December 11 th ...
Breaking Biology News(10 mins):Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 3New telemetry implants expected to change how large animal toxicology studies are conducted 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 4
... YORK Computed Tomography (CT) scans are an increasingly used ... organ or tissue. The value of CT scanning to diagnose ... these scans being used too frequently, in some cases unnecessarily" ... scans over the course of a persons life" In ...
... parasite has been studied for decades, but surprisingly, little ... cause disease. In a groundbreaking study published November 28 ... research team has for the first time measured which ... during actual infection in humans, not in cell cultures, ...
... new test can identify take-away paper-based food containers (such ... phthalates (plasticisers) are present because the containers were made ... and cardboard. In Italy, where the test was developed, ... packaging breaks food safety rules. Recycling paper and ...
Cached Biology News:Columbia researchers: Growth of CT scan use may lead to significant public health problem 2Columbia researchers: Growth of CT scan use may lead to significant public health problem 3Study of malaria parasite in patient blood finds distinct physiological states 2Study of malaria parasite in patient blood finds distinct physiological states 3Study of malaria parasite in patient blood finds distinct physiological states 4New test finds diisobutyl phthalate in some cardboard food packaging -- recycling is the issue 2
(Date:12/24/2014)... 24, 2014   BioLife Solutions , Inc. (NASDAQ: ... clinical grade hypothermic storage and cryopreservation freeze ... cells and tissues  ("BioLife" or the "Company"), today announced that ... May 4, 2015 (the "Annual Meeting"). Because the ...
(Date:12/24/2014)... (PRWEB) December 23, 2014 GMO corn cases ... Syngenta, are in the process of being consolidated in a ... In Re: Syngenta AG MIR 162 Corn Litigation, MDL No. ... Kansas. , Management of the Syngenta GMO corn multidistrict litigation ...
(Date:12/24/2014)... December 23, 2014 SoundConnect’s ... to introduce cutting edge communication technology, provide continued ... upgrades. This webinar series demonstrates online communication features ... leverage web conferencing’s most innovative and powerful tools. ...
(Date:12/24/2014)... York (PRWEB) December 23, 2014 According to ... Long Island Affiliate of ITRA Global, the national office market ... steady recovery. This is evidenced by the third quarter’s ... stock market. Low energy costs have held inflation down ...
Breaking Biology Technology:BioLife Solutions Sets Date for Annual Meeting of Stockholders 2Carey Danis & Lowe Reports on Syngenta GMO Corn Transfer Order 2SoundConnect Launches Leading Edge Business Communications Webinar Series 2SoundConnect Launches Leading Edge Business Communications Webinar Series 3ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3
... venture capital in more deals in 2006, but the improvement ... Ernst & Young, LLP and Dow Jones ... in 2006, including a $12 .5 million round by ... for a total of $58.47 million. The total, up from ...
... Lance Armstrong is a unique phenomenon. He's a talented athlete, ... league by himself. Or is he? , ,As many people know, ... National Center for Health Statistics report released by the ... the second year in a row. , ,Cancer patients as political ...
... director of technology programs for the University of Wisconsin-Madison, is ... he demonstrates in Part II of this interview. In ... In Part II (below), he addresses creating a culture of ... also is a featured speaker at the Fusion 2007 ...
Cached Biology Technology:Wisconsin fares slightly better in venture capital chase 2Wisconsin fares slightly better in venture capital chase 3Lance Armstrong and the future of cancer care 2Lance Armstrong and the future of cancer care 3Lance Armstrong and the future of cancer care 4Lance Armstrong and the future of cancer care 5
... peptide derived from the C terminal region ... This peptide sequence is downstream from the ... Connexin 36 antibody Cat. No. 51-6300. ... Reactivity: Mouse (positive control: mouse Connexin 36-transfected ...
Invitrogen's Calcium Phosphate Transfection Kit provides high-quality reagents to enable the introduction of DNA into tissue culture cells via calcium phosphate co-precipitation....
...
...
Biology Products: