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:8/31/2015)... 31, 2015 Research and Markets ( http://www.researchandmarkets.com/research/st5b3m/saudi_arabia ... Arabia Biomedical Sensors Market - Growth, Trends & Forecasts ... The Saudi Arabia Biomedical Sensors market is estimated at ... over the period 2014-2020 The near future ... genetic formulation of each individual. These sensors can be ...
(Date:8/25/2015)... and BELLEVUE, Wash. , Aug. ... advanced robotic systems, announced today it will unveil its ... vehicle (UGV), at the National Tactical Officers Association Conference ... The Guardian S is the first-ever commercially available ... years of research and in-field trials and is protected ...
(Date:8/20/2015)... , Aug. 20, 2015 The wearable ... that are active and healthy. However, wearable technology ... hospital environment to help improve diagnostic capabilities and ... from the Wearable Technologies Conference 2015 , ... applications for wearables in healthcare.    ...
Breaking Biology News(10 mins):Saudi Arabia Biomedical Sensors Market Report 2015 - Growth, Trends & Forecasts (2014-2020) 2Sarcos to Debut First-of-its-Kind Snake Robot 2Sarcos to Debut First-of-its-Kind Snake Robot 3Leaf Healthcare Releases Video from Wearable Technology Conference on New Applications for Wearables in the Hospital Environment 2Leaf Healthcare Releases Video from Wearable Technology Conference on New Applications for Wearables in the Hospital Environment 3
... fibrosis, HIV-fighting ,Trojan horses, new pharmaceuticals from the ocean. ... medications of the future. ,On 24 August, some of ... conference in Gothenburg, Sweden. In the field ... and eventually control, the behavior of cells. The scientists ...
... A Michigan State University researcher is challenging health ... be harmful. Norman Hord,s research suggests that although ... of nitrogen-based fertilizers and excessive nitrates in groundwater, nitrates ... may actually provide health benefits. Nitrate and nitrite ...
... more commonly called belly fat, is known to be a ... fat to accumulate? The culprit is likely not age, ... that occurs during the menopause transition, according to researchers at ... analyzed that could possibly account for the increase in visceral ...
Cached Biology News:10th Functional Genomics: Chemical Biology 2009 2Research supports calls to study health benefits of nitrate, nitrite 2Increase in visceral fat during menopause linked with testosterone 2
(Date:9/3/2015)... ... September 03, 2015 , ... If you plan to attend the 27th ... you will also want to sign up for the tour of Framingham State University's ... includes a walk through of the (8) chemistry teaching labs that are exclusively utilizing ...
(Date:9/2/2015)... LIBERTYVILLE, Ill. (PRWEB) , ... ... ... a leading provider of regulatory compliance, quality systems, analytical testing, education and ... consulting firm with expertise in medical device products/processes development, design control, validation, ...
(Date:9/2/2015)... ... September 02, 2015 , ... The wet form of ... special anti-vascular endothelial growth factor agents given by injection into the eye. Dry ... a scientific protocol for the many millions diagnosed with it. AMD usually starts ...
(Date:9/2/2015)... 02, 2015 ... announced the addition of Jain PharmaBiotech,s new ... Companies" to their offering. ... besides fluorescence in situ hybridization (FISH), comparative ... cytogenetics includes application of nanobiotechnology, microarrays, real-time ...
Breaking Biology Technology:Erlab Invites You to Tour the Largest Installation of Filtered Fume Hoods in the World 2NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 2NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 3NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 4NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 5NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 6NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 7StemCell GeneticMed Announces That It Has Started Stem Cell Treatments for Age Related Dry Macular Degeneration (AMG) 2Global Cytogenetics Technologies Study 2015-2025 - Latest Markets and Companies Analysis 2Global Cytogenetics Technologies Study 2015-2025 - Latest Markets and Companies Analysis 3
... - Because they live in a world where most ideas ... nave when it comes to how government works. The debate over ... , ,As proposed by Gov. Jim Doyle , the two-year ... economy. The pool of tax credits for investors in qualified start-up ...
... I've had the chance to play a bit more with ... at the conference, Jaman.com offers a growing library of films ... average about $6 per film. , ,While you can browse ... is the downloadable player, a desktop application that's part media ...
... - Looking to raise more venture capital for clinical ... firms presenting at the annual InvestMidwest venture capital forum ... also presented at the 2006 forum, would like to raise ... I clinical trials that are set to begin in early ...
Cached Biology Technology:Tech ideas in state budget will need help from entrepreneurs 2Tech ideas in state budget will need help from entrepreneurs 3Tech ideas in state budget will need help from entrepreneurs 4We're "Jaman": Purpose-driven browsers drive next wave of Web applications 2We're "Jaman": Purpose-driven browsers drive next wave of Web applications 3ZyStor seeks to raise $15M for clinical trials 2ZyStor seeks to raise $15M for clinical trials 3
... Purification Kit is designed for isolating DNA from ... protocol can be completed in less than one ... larger amounts of DNA. The purified DNA can ... Southern blotting. The MasterPure Kit was designed for ...
Caspase Activity Detector, SR-VAD-FMK Kit , 100 tests Consult technical datasheet for details....
HistoScan AP Universal Goat Kit...
...
Biology Products: