Abstract
Abstract o 1. First measurements of increased total oxygen consumption of web-building Araneus diadematus spiders over resting animals are reported for nine webs of an adult female. 2. Analysis of movie pictures and web photographs results in an estimate of the number of steps and the amount of up and down movement which the animal used in construction of a single web. 3. Combination of both measures permits calculation of step energy, which can be added to the chemical energy involved in silk recycling, to lead to an appraisal of advantages and disadvantages involved in the daily construction of individual orb webs by single animals. 4. This is compared to data from the literature on the web-building strategies of other spiders.
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