By Friedrich G. Barth
Spiders are fantastic creatures. Their diverse and intricate diversity of habit and hugely constructed sensory platforms are excellently tailored to the environmental stipulations - as is confirmed via their evolutionary good fortune. Over four hundred million years, spiders have built their sensory organs to a desirable technical perfection and complexity.
In his interesting ebook, Professor Friedrich G. Barth places this technical perfection into the context of "biology", within which the interplay among surroundings and sensory organs and the selectivity of the senses as a hyperlink among setting and behaviour play a big function.
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Extra resources for A Spider's World: Senses and Behavior
Perceptions are by no means comprehensive in a physical sense. Instead, they provide a limited and distorted image of the objectively measurable reality. Pablo Picasso once said, so we are told, that art is the lie that helps us to recognize the truth (Wilson 1984). In this sense, art and perception are close kin. We have become much more aware of the technical perfection of many sense organs, and their associated information-processing structures, thanks to a number of recent experimental innovations.
I L.. J "' i5 U5 J Displacement ro c l ll :I II ",,'I$ ' 11 + II ,, II 111 ,, lll Stretch " '¥" II ~I •'I' ·· ~ ,,,,•'· · ~ II IL•----·. ----Shear Fig. 4a-c. Some basic mechanical terms and principles. a A bar under tension (arrow) shows that displacement has to be distinguished from strain. b As seen from a singleended cantilever under load (arrow), the sites of maximal stress or strain need not coincide with those of maximal displacement. c A piece of material (shaded) is loaded happens at the surface of the material is always the same: at a given site, there is always extension (+e) in one direction and compression (-e) in the perpendicular direction.
The raw venom of C. 43 ng/mg fly. Apart from several disulfide-rich peptides like the neurotoxic CSTX1 the venom of Cupiennius salei also contains peptides of smaller molecular mass which show antibacterial activity (KuhnNentwig et al 1998). Sensory Systems What is the biological significance of sense organs? This question is central to an understanding of the spider's world, toward which we have striven all these long years. Sense organs are the interfaces between the environment and the central nervous system, and hence between environment and behavior.