grant burleigh's picture

Spiders on a notice board

Observed: 10th August 2012 By: grant burleighgrant burleigh’s reputation in Invertebratesgrant burleigh’s reputation in Invertebratesgrant burleigh’s reputation in Invertebratesgrant burleigh’s reputation in Invertebratesgrant burleigh’s reputation in Invertebrates
062
071
0642
Description:

The images of the two darker spiders were taken about an hour apart and they would appear to illustrate different individuals. They were on a part of the board that is more shaded, the third (lighter) spider being on a more sunlit area. (Is it known if these spiders display a consistent matching of body marking to environment?)
Brightness and colour temperature controls were adjusted after uploading to make the backgrounds in these images broadly equivalent i.e. the spiders appear to be genuinely dark or light.

Identifications
Species interactions

No interactions present.

Comments

Alan Thornhill's picture

Unlikely

I can't see that it's possible for Salticus to genuinely change colour in response to light conditions. It's markings are the result of different colour hairs. See -
http://sv.wikipedia.org/wiki/Fil:Salticus_scenicus_a1.jpg
Like hairs of any other creature they can't rapidly change colour. But maybe they have some quality that makes them look lighter or darker depending on the amount of light falling on them??