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

By Friedrich G. Barth

ISBN-10: 3642075576

ISBN-13: 9783642075575

Spiders are magnificent creatures. Their diversified and intricate diversity of habit and hugely constructed sensory structures are excellently tailored to the environmental stipulations - as is confirmed through their evolutionary luck. Over four hundred million years, spiders have built their sensory organs to a desirable technical perfection and complexity.
In his fascinating e-book, 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 atmosphere and behaviour play an important position.

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

Sample text

Entrained activity rhythm of Cupiennius salei (adult females) after reversal of LD cycle (12 :12 light-dark) to DL cycle. Top This actogram shows high activity of the animal when the light is switched on at 06:00 h (initial LD cycle); within 48 h, however, the spider is synchronized with the new DL cycle. Bottom Distribution of hourly activity (± SD) during 21 days. --~~--e=~~~ 0 6 12 18 24 Time [h] walk shortly after the onset of darkness. The experiments also showed that their activity is usually maximal in the first three hours of the dark phase and the activity period usually lasts 6 to 7 hours.

Reclusa) but particularly widespread in South America; its poison has a cytotoxic and hemolytic action. • Phoneutria (Ctenidae), of Central and South America, the toxin of which is a particularly effective nerve poison that causes fatal paralysis (Plate 11). • Harpactirella (Barychelidae, Mygalomorphae), called "baboon spiders" by the locals; a dangerous South African species belongs to this genus. In the publications by Maretic (1987) and by Bettini (1978) the interested reader will find more about the pharmacology and clinical aspects of spider poisons and bites.

Seyfarth 1980) IV Daily Activity Rhythm 24 >. I'll 0 ---- - -- _ _ LD ---- - ----- ------ -- - --- . 1-- ~- 5 • - --- 10 - 15 ::-: 24 - 6 12 - • - 18 • 24 - - 6 - --- DL • 12 18 Fig. 2. Entrained activity rhythm of Cupiennius salei (adult females) after reversal of LD cycle (12 :12 light-dark) to DL cycle. Top This actogram shows high activity of the animal when the light is switched on at 06:00 h (initial LD cycle); within 48 h, however, the spider is synchronized with the new DL cycle. Bottom Distribution of hourly activity (± SD) during 21 days.

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


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