Navigation Links
Mid-ocean creatures control light to avoid becoming snacks
Date:11/10/2011

DURHAM, NC -- If you're a snack-sized squid or octopus living in the ocean zone where the last bit of daylight gives way, having some control over your reflection could be a matter of life and death.

Most predators cruising 600 to 1,000 meters below the surface spot the silhouette of their prey against the light background above them. But others use searchlights mounted on their heads.

Being transparent and a little bit reflective is a good defense against the silhouette-spotters, but it would be deadly against the "headlight fish," says Duke postdoctoral researcher Sarah Zylinski.

Transparency is the default state of both Japetella heathi, a bulbous, short-armed, 3-inch octopus, and Onychoteuthis banksii, a 5-inch squid found at these depths. Viewed from below against the light background, these animals are as invisible as they can be. Their eyes and guts, which are impossible to make clear, are instead reflective. But when hit with a flash of bluish light like that produced by headlight fish, they turn on skin pigments, called chromatophores, to become red in the blink of an eye.

During ship-board experiments over the Peru-Chile trench in 2010, Zylinski shined blue-filtered LED light on specimens of both creatures to watch them rapidly go from clear to opaque. When the light was removed, they immediately reverted to transparent. On a second research cruise in 2011 in the Sea of Cortez, Zylinski measured the reflectivity of the octopuses and found they reflected twice as much light in their transparent state as in the opaque state.

Zylinski experimented with 15 to 20 different species of cephalopod pulled up from the deep by the research ships, but only these two responded to the blue light. "I went through several things I thought would stimulate behaviors," she says. Shallow-water cephalopods (squid, ocotopi and cuttlefish) will change their body patterns for a shadow or shape passing overhead, but these de
'/>"/>

Contact: Karl Leif Bates
karl.bates@duke.edu
919-681-8054
Duke University
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Researchers discover source of essential nutrients for mid-ocean algae
2. Snakes, salamanders and other creatures thrive in areas with higher deer populations
3. Sea creatures sex protein provides new insight into diabetes
4. Marine scientists return with rare creatures from the deep
5. Coastal creatures may have reduced ability to fight off infections in acidified oceans
6. Peacekeeping creatures help maintain woodland diversity
7. Run-off, emissions deliver double whammy to coastal marine creatures, UGA study finds
8. Hidden infections crucial to understanding, controlling disease outbreaks
9. bioMETRX, Inc. Signs Deal To Acquire Controlling Interest in Biometric Solutions, LLC
10. Can genetic information be controlled by light?
11. Genes that control cell death fingered in age-related hearing loss
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Mid-ocean creatures control light to avoid becoming snacks
(Date:7/11/2014)... is evidence that under the normal circumstances, ... development, maintain neuronal environment, and exhibit therapeutic ... neurodegenerative disease. Previous studies have found that ... after chemical induction have reduced viability, which ... Prof. Xiaodong Yuan, Kailuan General Hospital, Hebei ...
(Date:7/11/2014)... Using spider toxins to study the proteins that let ... say they have stumbled upon a biological tactic that ... insect plagues in a safe and environmentally responsible way. ... be lethal for one species and harmless for a ... target specific pests without harming beneficial species like bees. ...
(Date:7/10/2014)... COLORADO SPRINGS, Colo. , June 27, 2014 ... announces that the National Institute of Standards and ... appointed 10 of its academic research and forensic ... Board (FSSB).  The Board is an element of ... These AAFS members are among the first appointments ...
Breaking Biology News(10 mins):Potent spider toxin 'electrocutes' German, not American, cockroaches 2Potent spider toxin 'electrocutes' German, not American, cockroaches 3Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 2Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 3
... state of chronic inflammation. If chronic, the inflammation will ... devastating disease multiple sclerosis, hyperactivity of immune cells called ... Researchers at BRIC, the University of Copenhagen, have identified ... combat such hyperactive T-cells in blood from patients with ...
... Lincoln, Neb., Feb. 17, 2014 -- Fertilizer could be too much ... findings to be published online Feb. 16 by the journal ... nitrogen will increase the amount of grass that can be grown. ... are better adapted to survive in harsher times. It results in ...
... why skeletal muscle stem cells stop dividing and renewing ... opportunity for managing muscle-wasting conditions in humans, says a ... to CU-Boulder Professor Bradley Olwin, the loss of skeletal ... to sarcopenia, a debilitating muscle-wasting condition that generally hits ...
Cached Biology News:New blood cells fight brain inflammation 2Worldwide study finds that fertilizer destabilizes grasslands 2CU-Boulder stem cell research may point to new ways of mitigating muscle loss 2CU-Boulder stem cell research may point to new ways of mitigating muscle loss 3
(Date:7/10/2014)... -- Kainos Capital, a firm specializing in acquiring and managing ... acquired the Slim-Fast brand from Unilever. Unilever will retain ... transaction were not disclosed. Slim-Fast is a ... ready-to-drink shakes, powders, bars and snacks to retail customers ... the United Kingdom and Ireland.  ...
(Date:7/10/2014)... , July 10, 2014 Research and ... of the "International Photonic Integrated Circuit (Monolithic ... to 2019" report to their offering. ... The concept of photonic integration traces its roots ... The promise of photonic integration went unexplored and ...
(Date:7/10/2014)... -- According to the International Atomic Energy Agency ... from terrorists acquiring sufficient quantities of plutonium or ... nuclear explosive device. The IAEA also notes that ... gram-level quantities, which can be challenging to detect ... new study appearing this week in the ...
(Date:7/10/2014)... 17, 2014 Using microscopic polymer light resonators ... researchers at MIT,s Quantum Photonics Laboratory have developed ... the parts-per-billion range. Optical sensors are ideal for ... signal-to-noise ratio, compact, lightweight nature, and immunity to ... had been developed before, the MIT team conceived ...
Breaking Biology Technology:Kainos Capital Acquires Slim-Fast From Unilever 2International Photonic Integrated Circuit (Monolithic Integration, Hybrid Integration, Module Integration) Market - Forecasts to 2019 2Sensitive detection method may help impede illicit nuclear trafficking 2Swell new sensors 2
... With all the domestic and global issues going on ... the world's leaders viewed issues in yesterday's critical moments. ... had to shoulder huge responsibilities. They are worth applying ... perspectives may help broaden your view of things. That's ...
... startup and spin-off companies are gaining attention from ... of this is Primorigen Biosciences LLC , ... analysis of cellular reprogramming and differentiation. , ,Primorigen, ... related products, will use a pair of investments ...
... Wis. - Norlight Telecommunications, Inc., which ... announced that it will roll out its new Voice ... businesses in Green Bay and Madison. , ,The ... growth market by offering integrated communications bundles of local ...
Cached Biology Technology:Business leaders can learn from historical insights 2Business leaders can learn from historical insights 3Business leaders can learn from historical insights 4Business leaders can learn from historical insights 5Wisconsin start up Primorigen Biosciences corrals out-of-state investment 2Norlight will offer VoIP in Madison, Green Bay 2
... protein assay reagents package is used for determining ... and detergents. The RC DC protein assay is ... for 500 standard assays: 250 ml RC reagent ... alkaline copper tartrate solution, 2 L dilute Folin ...
... SureLINK Bioconjugation Kit provides a powerful ... carbohydrates and nuceleic acids. The kit provides ... with reagents for quantifying conjugation efficiencies. It ... fluorophores, biotin and other tags with a ...
...
MAb to HLA, Class II-DR+DP Dry Ice: No Preservative: NaN3 Availability When Not in Inventory: 14-21 Business Days...
Biology Products: