Iridescence ...

sean69

Star
BGOL Investor
*Inspired by Shane's Bumblebee "Random Thought"*

Might very well be common knowledge to some, but meh, we have enough "herbivorous pussy? What do i do?" threads ...


Bees attracted by floral iridescence

image


Iridescence
is the optical phenomenon where a surface appears in different colors depending on the perspective (angle of incident light) of the observer, due to miniature structural features on the surface that scatter light.

Birds, fish, insects and reptiles use this for species recognition and mate selection.

Sometimes a hybrid color resulting from "chemical color" (pigments in material absorb all colors except a few, which give the apparent color) and structural color (iridescence)

Researchers at Bristol University in the UK have observed a species of bumble bee (Bombus terrestris)
that's able to discriminate between chemical and structural color in hibiscus and tulip flowers.

Suggesting that iridescence as a communication mechanism in flowers and plants may be wide-spread and our ability to observe it, limited by our feature size resolution.

http://www.bristol.ac.uk/news/2009/6090.html
 
Interesting...

...now I want some pictures of floral iridescence...

I'll search for some pictures of "floral" iridescence.

In the meantime, here's some pics of the nano-sized (a billionth of a meter) structural features of the scales responsible for iridescence in butterfly wings.


The Morpho Butterfly (classic example)

butterfly.gif




Some SEM pictures ...

butterfly-scales-s.jpg

https://richarddawkins.net/forum/viewtopic.php?f=5&t=71773&start=25


boris6

boris2

boris5

boris8

http://www.optics.rochester.edu/workgroups/cml/me111/sp98-projects/boris/index.html


Color-enhanced image ...


cemr_scale.jpg

http://centres.exeter.ac.uk/cemr/cemr_scale_image.html



How it works ...



Hierarchical features ...
butterfly-color-wing.jpg



Color modulation through light interaction ...
butterfly-color-interference.gif

http://animals.howstuffworks.com/insects/butterfly-colors2.htm



And for the kids (Mcguyver, etc) ...


 
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