Abstract
A high degree of mobility was observed in a population of Nephila clavipes (L.) (Araneae; Araneidae) in southeastern Peru, September-December, 1979. Prey capture and consumption were measured relative to the number of kleptoparasitic spiders (Araneae; Theridiidae; Argyrodes sp.) in the webbing. Those N. clavipes that moved their webs shortly after observation had consumed significantly fewer prey items than those that maintained their web site. However, total prey capture was not different between the two groups. Prey consumption was significantly reduced by each additional kleptoparasite in the web. Consequently, there was a complete correlation between the number of Argyrodes individuals in a spider's web and the percentage of those spiders that relocated their web.
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