![]() ![]() Cephalopods, however, have taken skin light-sensing to a new level, using this trait to entirely shift their appearance in the blink of an eye. ![]() For example, clams and other bivalves are able to sense and move towards light. B) Antibody staining of the skin reveals that r-opsin (white) is expressed in the skin cells.Ĭonclusion: Other mollusks have been shown to have skin that is reactive to light. Skin from the region within the yellow box is shown magnified in B. Okay, this is pretty cool… you can freak out now. And the skin samples the scientist analyzed were most sensitive to the same wavelengths of light that the well-developed octopus eyes are specialized to see. The genes in the skin are, in fact, nearly identical to those in the eye. Furthermore, other genes necessary for vision in the eye are expressed in the skin (including some genes called G-protein α(q) and phospholipase C). Turns out that the same genes present in the eyes responsible for light detection (called opsin genes, specifically r-opsin in this case) are also found expressed in the skin (Fig. What allows skin to respond to light? The researchers found a pretty amazing explanation for how the skin is able to respond to light without visual sensory input: the skin itself is able to act like an eye! No, the octopus is not some monster from the black lagoon covered in a million tiny creepy eyes- so no need to freak out. Figure 3: The California two-spot octopus ( Octopus bimaculoides). The skin was then placed under different wavelengths to see which wavelengths elicited the greatest light-activated change to skin pigmentation. Additionally, pieces of skin were dissected from octopuses, severing any nervous connection. Researchers sequenced the genes present in the skin and used antibody staining to reveal what genes could be controlling the light-activated changes to the skin. The Methods: Researchers at the University of California Santa Barbara studied how skin reacted to light in the California two-spot octopus ( Octopus bimaculoides Fig. However, when pieces of octopus skin are removed from the animal (so they no longer have contact with the eyes or the brain), chromatophores still respond when exposed to light! How is the skin independently responding to light cues when the brain and eyes are not telling it how to respond?! In an attempt to answer this question, researchers tried to unveil the mechanism behind the octopus’ disguises. ![]() So they are likely not utilizing color information to guide their pigmentation patterns. Experiments have shown that octopuses rely upon their well-developed, camera-like eyes to mediate their camouflage, matching their bodies to the surrounding environment based on features such as light intensity and contrast of object edges (interestingly, octopuses are color blind!). While we know that the chromatophores allow octopuses to change their skin color, it is still a mystery as to how the octopuses determine what background they need to blend in to, especially in such a short time frame. Cephalopod-inspired design of electro-mechano-chemically responsive elastomers for on-demand fluorescent patterning. Figure 2: Schematic showing how chromatophores are able to change color by contracting to reduce skin pigmentation (left image) and expanding to increase pigmentation (right image). Muscles contract or relax causing chromatophores to alter the pigment expression (Fig 2). Chromatophores are pigment containing, light reflecting cells controlled by muscles. So how exactly are octopuses able to disguise themselves so masterfully? Structures in their skin, called chromatophores, are largely responsible for changes in pigmentation and patterning. The octopus unveils itself in a little over 3 seconds! Source: Figure 1: Can you see the octopus in the first image? Watch as these images reveal an octopus hidden in an algae covered rock. To see just how incredible octopus camouflage is, watch this short video. They are so good at these optical illusions that within seconds, octopuses can entirely disappear as they transform into rocks, algae, or other features around them (Fig 1). By changing the coloration, patterns, and even texture of their skin, octopuses are able to camouflage with their surrounding environment. Introduction: Octopuses are true masters of disguise. Eye-independent, light-activated chromatophore expansion ( LACE ) and expression of phototransduction genes in the skin of Octopus bimaculoides. ![]()
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