Thursday, August 11, 2011

Now you see me, now you don’t: cephalopods in hiding


Today’s post is about a natural phenomena so strange that one would swear it is a result of something otherworldly. However, sometimes the truly bazar is hiding in our own backyard and, despite the “reality” of this story, it seems worth sharing to those ether-minded readers.


(Source: http://www.dimensionsguide.com/size-of-an-octopus/)


Marine biologist, Roger Hanlon, studies cephalopods, which include squid, cuttlefish and octopus. During one of his expeditions, he was able to film one of the most interesting abilities of these sea creatures: the capacity to completely mimic their environment. On his Marine Biological Laboratory website page, Hanlon writes that the “distinguishing feature of cephalopods is that individual animals can change their appearance with a speed and diversity unparalleled in the animal kingdom: we term this ‘rapid, neurally controlled polymorphism.’” He goes on to write how some cephalopods can have 30 to 50 different appearances.  
Biologists have determined six “mechanisms of camouflage;” including: 1) General background resemblance, 2) Deceptive resemblance (including mimicry), 3) Disruptive coloration, 4) Countershading/concealment of the shadow, 5) Rarity through polymorphism, and 6) Cryptic behavior and vigilance. What is so striking about cephalopods is their ability to use all six mechanisms. A complete understanding of how this process takes place still alludes scientist. Still, they have surmised that sight is the primary cue for both texture and color changes despite being colorblind. The video goes on to show how the skin actually changes pigment and does a far better job of demonstrating these abilities than any words could.  

(Source: http://www.sciencefriday.com/videos/watch/10397)
Special Note: Apologies are due for the limited number of recent posts. The Reaching Through the Ether team has been busy developing a website to replace the companion blog. This site will greatly expand on news, expeditions, films and books that creep out of the depths of the ether. Currently, this blog is still being used until further notice. 

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