A Spider's World: Senses and Behavior by Friedrich G. Barth PDF

By Friedrich G. Barth

ISBN-10: 3642075576

ISBN-13: 9783642075575

Spiders are amazing creatures. Their assorted and complicated diversity of habit and hugely constructed sensory platforms are excellently tailored to the environmental stipulations - as is confirmed by means of their evolutionary good fortune. Over four hundred million years, spiders have constructed their sensory organs to a desirable technical perfection and complexity.
In his exciting booklet, Professor Friedrich G. Barth places this technical perfection into the context of "biology", during which the interplay among atmosphere and sensory organs and the selectivity of the senses as a hyperlink among setting and behaviour play an incredible function.

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Additional resources for A Spider's World: Senses and Behavior

Sample text

The spider may come back after three or four hours or later on. Having captured prey, the spider eats it on the spot, rather than immediately carrying it back to the protection of the retreat. These initial observations of Cupiennius salei in March 1977, on the grounds of the Finca Seacte and Finca Remedios, were simultaneously exciting and encouraging for us, because until then it had been so difficult to find Cupiennius salei in its homeland at all, and also because we had already found out that in order to do behavioral experiments, for instance on courtship (see Chapter XX), in the laboratory it might be very important to choose the right time of day.

The reason: toxins that cause paralysis act on channel proteins in cell membranes in such a specific way that they are excellent tools for characterizing ion channels. For instance, there are neurotoxic spider poisons that block voltage-dependent presynaptic calcium channels and in this way prevent the release of transmitter at neuromuscular 33 synapses (Bowers et al. 1987; Branton et al. 1987). Other poisons also act presynaptically but oppositely, causing the transmitter at neuromuscular synapses of insects to be released in massive quantities (Cull-Candy et al.

The direction in which the load-bearing capacity of the cuticle is largest is the same as the direction of the greatest principal stress. If the lamellae were to be oriented parallel to the surface in the vicinity of the slit, there would be a risk that fractures would develop parallel to the surface; this is known to be especially likely when a notch has a high length:width ratio and the stress concentration reaches values above 20 (Peterson 1966). In the meso- and endocuticle (inner part of the slit) the lamellae hardly change their orientation near the slit.

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A Spider's World: Senses and Behavior by Friedrich G. Barth


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