By Friedrich G. Barth
Spiders are outstanding creatures. Their various and intricate diversity 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 fascinating ebook, 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 important position.
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Extra resources for A Spider's World: Senses and Behavior
C. getaziQ C. gelazi cf 4 4 2 2 ~ ~ ............ Time [h) Fig. 4a-f. Daily locomotor activity patterns of adult males and females of Cupiennius salei, C. coccineus, and C. getazi (in all cases n =10); mean (thick line) and standard error (thin line, only lower limits shown). Horizontal lines indicate SOo/o values of activity and the shaded areas the time periods of maximum activity. The asterisks mark time of Comparison among species And this is not yet the entire story. In another actograph experiment, we returned to the question of activity distribution over the day in the entirely different context of courtship and the reproductive isolation of species from one an- maximum activity in C.
The chelicerae of Cupiennius sa lei. Arrows point to openings of venom gland duct at the tip of the fangs. Bar 100 11m The Poisons orientalis, Cupiennius salei was roughly in the middle of the range of toxicity measured as LD 50 (Fig. 2). From figure 3 it can be seen that when the test animal is taken away from the spider as soon as it has been bitten, after 24 hours prey weighing less than 40 mg have a mortality ;:: 50% (Boeve 1994). 2 and 150 nl among the 18 spider species tested. Cupiennius salei belongs to the group with poison that most quickly causes immobility.
4. Climate diagrams for the habitats of Cupiennius in Central America, showing average monthly temperatures and rainfall. Dry seasons (dotted area) occur only in some of the locations. The number of years for which measurements were taken is found below the name of the site in square brackets. The two numbers at the upper right represent the average annual temperature (°C) and the average annual rainfall (mm). Vertical shading indicates the wet season, whereas the black areas indicate monthly rainfall exceeding 100 mm.
A Spider's World: Senses and Behavior by Friedrich G. Barth