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:8/19/2014)... world, leprosy and tuberculosis live side-by-side. Worldwide there ... year, with nearly all of them occurring where ... Bacille Calmette-Guerin, or BCG, provides only partial protection ... potent vaccine is needed to combat both diseases. ... against both diseases., In a study published in ...
(Date:8/19/2014)... Scientists at the Houston Methodist Research Institute have figured ... using a pipette -- a common laboratory tool that,s ... preliminary test results in a recent issue of the ... "Studying single cells and their unique functions has become ... faculty member Lidong Qin, Ph.D., the project,s principal investigator. ...
(Date:8/19/2014)... UTSA researchers has been awarded a nearly $40,000 grant ... (NCPTT), an office of the National Park Service (NPS) ... fund a one-year study of the energy efficiency and ... in hot, humid climates. , Radiant barriers are reflective ... reflect heat back, thereby reducing the amount of heat ...
Breaking Biology News(10 mins):New vaccine shows promise as stronger weapon against both tuberculosis and leprosy 2Moving single cells around -- accurately and cheaply 2UTSA researcher awarded $38K+ to evaluate energy efficiency options for historic homes 2UTSA researcher awarded $38K+ to evaluate energy efficiency options for historic homes 3
... is available in Spanish . , A ... has been released by Agricultural Research Service (ARS) scientists and ... aquatic plant native to South America that has infested freshwater ... in the southeastern United States. The plant is a real ...
... CITY, Calif. and WEST PALM BEACH, Fla. ... global provider of authentication and endpoint protection solutions and ... (EMR) and Discharge Systems for Emergency Rooms and Urgent ... biometrics from DigitalPersona into the ScriptRx System. Designed for ...
... venue for the 3rd Baltic Congress of Osteoporosis which ... to be held in English, is jointly organized by ... Osteoporosis Foundation, Lithuanian Association of Metabolic Bone Diseases and ... most disabling conditions of older adults and elderly. These ...
Cached Biology News:Scientists release biocontrol for water hyacinth 2ScriptRx and DigitalPersona Team Up to Secure Emergency Room and Urgent Care Electronic Medical Records 2ScriptRx and DigitalPersona Team Up to Secure Emergency Room and Urgent Care Electronic Medical Records 3ScriptRx and DigitalPersona Team Up to Secure Emergency Room and Urgent Care Electronic Medical Records 4
(Date:8/19/2014)... Aug. 19, 2014 Research ... of the "Spectroscopy Equipment and Accessories ... to their offering. This ... Equipment and Accessories in US$ Thousands by ... spectrophotometers, Raman Spectrometers, NMR-EPR Spectrometers, Near Infrared ...
(Date:8/19/2014)... , Aug. 19, 2014 /PRNewswire/ - iCo Therapeutics Inc. ... today reported results of its Oral Amphotericin B ... reservoirs.  The study, conducted by ImmuneCarta®, the immune ... vitro effectiveness of Oral Amp B in ... in individuals despite intensive treatment with antiretroviral therapy. ...
(Date:8/18/2014)... Aug. 18, 2014 /PRNewswire/ - SQI Diagnostics Inc. (TSX-V: SQD), ... technologies and products for advanced microarray diagnostics, today announced ... August 22 at 2:00 pm ET.  ... provide a brief review of SQI,s recent commercialization progress ... diagnostics industry veteran recently appointed to the Board of ...
(Date:8/18/2014)... Global HIV Infection Drug Market and Pipeline Insight is ... HIV infection and the number of deaths due to AIDS ... across the globe. It has been estimated that the death ... 2013, with the rates for children being even much lower. ... rates has been the improved access to antiretroviral drugs and ...
Breaking Biology Technology:Global Spectroscopy Equipment and Accessories - Strategic Business Report 2014 2iCo Therapeutics Announces Positive Oral Amphotericin B Study Results 2iCo Therapeutics Announces Positive Oral Amphotericin B Study Results 3SQI Diagnostics Announces Investor Conference Call with Dr. Allan Pronovost 2SQI Diagnostics Announces Investor Conference Call with Dr. Allan Pronovost 3Global HIV Infection Drug Market Overview 2Global HIV Infection Drug Market Overview 3Global HIV Infection Drug Market Overview 4
... tiny man with giant ideas. Ill never forget the one and ... a conference of business executives in Cambridge, Massachusetts. There were one ... for a keynote, Drucker spoke immediately after lunch. He had to ... effortlessly for almost two hours. No Powerpoint. No props. No nonsense. ...
... The City of Madison has been awarded the top ... for Digital Government's 2005 Digital Cities Survey, an ... technology. The annual survey is conducted by the Center ... www.cityofmadison.com , allows visitors access to features such as ...
... and marketers have been hyping any time, anywhere computing for ... starting a technology company, anywhere needs to be spittin distance ... or Boston. You might get away setting up shop in ... well, there is no beyond that. , ,The bias is ...
Cached Biology Technology:Praise for the principles of Peter 2Praise for the principles of Peter 3Praise for the principles of Peter 4Does location matter anymore? 2Does location matter anymore? 3
... The x2 Dual-Binary Analytical System more than ... LC and LC/MS. The fast analysis cycles ... by up to 100% in tandem mode. ... multi-dimensional mode. Using backflush or heartcut configurations, ...
... for immune complex disruption (ICD) of antigen/antibody ... a combination of low pH and heat. ... to microplate wells which are coated with ... HIV-1 p24. The immobilized monoclonal antibody captures ...
Request Info...
... EVOlyzer is Tecans new Enzyme-Linked Immunosorbent Assay ... Freedom EVOlyzer is a dedicated EVO platform ... reader, washer and incubation units operated by ... EVOlyzer is available in three sizes - ...
Biology Products: