The ultimate camo: Team to mimic camouflage skill of marine animals in high-tech materials

Apr 22, 2011
Iridophores in squid are highly angle dependent. This image shows the same iridophore splotches viewed at normal (red) and oblique (blue) viewing angles. Credit: L. Mäthger, MBL

(PhysOrg.com) -- Camouflage expert Roger Hanlon of the Marine Biological Laboratory (MBL) is co-recipient of a $6 million grant from the Office of Naval Research to study and ultimately emulate the exquisite ability of some marine animals to instantly change their skin color and pattern to blend into their environment.

Hanlon, who has spent more than three decades studying the artistry of , octopus, and cuttlefish (a class of known as the cephalopods), is collaborating with materials scientists and nanotechnologists at Rice University toward the goal of developing materials that can mimic cephalopod camouflage.

Hanlon and Mathger: MBL Senior Scientist Roger Hanlon and Assistant Research Scientist Lydia Mäthger test the ability of a cuttlefish to adapt to a disruptive background pattern. Photo by T. Kleindinst.

"Our internal name for this project is 'squid ,' but it is really about fundamental research," says Naomi Halas, an expert in nano-optics at Rice University and the principal investigator on the four-year grant. "Our deliverable is knowledge, the basic discoveries that will allow us to make materials that are observant, adaptive, and responsive to their environment."

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Cuttlefish, as shown in this video, have extraordinary camouflage skills. They also have light-sensing proteins distributed throughout their skin. How these proteins interact with the animal's visual system to enable instantaneous changes in skin pattern and color is a focus of Roger Hanlon's research at the MBL. Credit: Roger Hanlon, MBL

In 2008, Hanlon and MBL colleagues Lydia Mäthger and Steven Roberts discovered that cephalopod skin contains opsins, the same type of light-sensing proteins that function in the eyes.

"This project will enable us to explore an exciting new avenue of vision research – distributed light sensing throughout the skin," Hanlon says. "How and where that visual information is used by the nervous system is likely to uncover some novel neural circuitry."

This image shows chromatophores (large brown, red and yellow structures) and iridophores (pink iridescent spotches) in the skin of the squid Loligo pealeii. Credit: L. Mäthger, MBL

Hanlon and his team will perform experiments with cephalopods to determine how opsin molecules receive light and aid the animal's visual system in adjusting skin patterns for communication and camouflage. A wide range of techniques will be used to accomplish these aims. The MBL team, which includes scientists Mäthger and Alan Kuzurian, will be collaborating with marine biologist Thomas Cronin of the University of Maryland, Baltimore County, on these investigations.

"This is inherently a multidisciplinary problem," Halas says. "What can we, as engineers, learn from the way these animals perceive light and color?" The project team's engineers will focus on emulating cephalopod skin using new metamaterials—materials that blur the line between material and machine.

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More information: Selected Publications:

Mäthger, L.M., Roberts, S. and Hanlon, R.T. 2010. Evidence for distributed light sensing in the skin of cuttlefish, Sepia officinalis. Biology Letters 6: 600-603. (PDF)

Mäthger, L.M., Denton, E.J., Marshall, J. and Hanlon, R.T. 2009. Mechanisms and behavioral functions of structural coloration in cephalopods. Journal of the Royal Society Interface 6: S149-S164. (PDF)

Sutherland, R. L., Mäthger, L. M., Hanlon, R. T., Urbas, A. M., Stone, M. O. 2008. Cephalopod coloration model. I. Squid chromatophores and iridophores. Journal of the Optical Society of America, 25 (3): 588-599. (PDF)

Mäthger, L.M., and Hanlon, R.T. 2007. Malleable skin coloration in cephalopods: selective reflectance, transmission and absorbance of light by chromatophores and iridophores. Cell and Tissue Research 329: 179-186. (PDF)

Provided by Marine Biological Laboratory

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