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 What is the reason scorpions glow in UV?

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PostSubject: What is the reason scorpions glow in UV?   3/7/2008, 10:23 pm

I heard to attract moths that can see UV, to reflect some wavelengths in order to reduce the amount of heat, for communication, etc.

Is there any set reason yet?
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PostSubject: Re: What is the reason scorpions glow in UV?   3/7/2008, 10:51 pm

The general scientific community still doesn't know. I heard of one study that found less moths come near them on full moons, though.

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PostSubject: Re: What is the reason scorpions glow in UV?   3/7/2008, 11:20 pm

maybe God likes to play with glow in the dark 'things' too clown
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PostSubject: Re: What is the reason scorpions glow in UV?   3/8/2008, 2:42 am

Wow . . . I wonder how many LEDs are in his flashlight.

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PostSubject: Re: What is the reason scorpions glow in UV?   3/8/2008, 7:51 pm

While no one really knows the real reason they are UV reactive there
are some pretty good theories out there, I found this reference for one such theory at:


http://www.madsci.org/posts/archives/1999-09/937872048.Zo.r.html


I've also pasted in the text should the link go bad at some point:

Date: Mon Sep 20 11:42:25 1999
Posted By: Rob Campbell, Oceanography, University of British Columbia
Area of science: Zoology
ID: 937621083.Zo

"One of them mentions that this is probably an adaptation to lure in prey. These scorpions reflect ultraviolet (UV) light, which is what makes them glow under black light. Scorpions are predators, and hunt by capturing their prey with their pincers and stabbing with their barbed stinger- while they will take mice or small birds that are unlucky to get too close, they generally eat insects. It turns out that many plants emit ultraviolet light signals that draws in pollinators, which are often insects (e.g. bees); by reflecting UV light, the scorpion may be, in a sense, "pretending" to be a flower. Also, many insects are what we call phototactic, which basically means that they are attracted to light- by emitting a strong UV signal, the emperor scorpion could be taking advantage of this phototactic behaviour to attract prey.

So, you can see that a UV reflecting scorpion has an advantage over a non-UV reflecting scorpion, because it could attract more prey. Because a UV reflecting scorpion might be able to grow bigger and be less likely to be eaten by a predator, or last longer when food became scarce, their survival would probably be greater than a non-UV reflecting scorpion who gets less to eat. Under natural selection, one could expect an advantageous trait like UV reflection to become more predominant, until eventually it became the only trait found (i.e. as the non-reflectors got eaten or died off in hard times)- this is how it would evolve.

Rob Campbell, MAD Scientist. "
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PostSubject: Re: What is the reason scorpions glow in UV?   3/8/2008, 9:21 pm

That's kind of cool . . . I wonder if anyone's done thesis work on it, or if it's all theory.

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