New PDF release: A Spider's World: Senses and Behavior

By Friedrich G. Barth

ISBN-10: 3642075576

ISBN-13: 9783642075575

Spiders are terrific creatures. Their different and intricate variety of habit and hugely built sensory structures are excellently tailored to the environmental stipulations - as is confirmed by means of 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 booklet, Professor Friedrich G. Barth places this technical perfection into the context of "biology", during which the interplay among surroundings and sensory organs and the selectivity of the senses as a hyperlink among surroundings and behaviour play an enormous position.

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Extra info for A Spider's World: Senses and Behavior

Sample text

Finally, the characteristic formation of groups of slits and the origin and effect of natural stimuli will be discussed. 1 Occurrence and Topography of Slit Sensilla Slit sense organs are a feature unique to the arachnids. They were first mentioned in print over 100 years ago, by Bertkau {1878). There followed detailed reports of their presence in various spiders by Mclndoo (1911), Vogel {1923) and Kaston {1935). After a 20-year pause, Pringle (1955) took up the subject again and, in a pioneering work, showed that these sensilla function as mechanoreceptors.

The timing of the return to the retreat varies widely. 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.

1, Chapter III). As will be described in Chapter XX, vibratory communication plays an especially important role in reproductive isolation of the species. Nevertheless, it is likely that differences in the daily activity patterns also contribute by isolating the species temporally from one another, producing a partial "time sharing". Cupiennius coccineus in particular (males and females) has a relative activity minimum at the time when activity of Cupiennius getazi (males and females) is maximal.

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

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