Abstract
Individual variation is a ubiquitous and important factor that affects ecological dynamics. This study examined individual variation in the nest-use pattern of the jumping spider Phidippus audax. Although the jumping spider is a diurnal species, field observations in this study revealed that the majority of individuals remained in their nests during the day. An accompanying examination of the hunger level of the spiders revealed that spiders that remained in nests were more starved than those observed outside nests. If spiders actively forage when they are starved, as has been suggested by previous studies, one would expect to see the opposite trend (i.e., spiders that remained in nests are more satiated). Thus, the pattern observed in the field contradicts the known behavioral pattern of the spiders. An individual-based model was used to investigate the behavioral mechanism of the spider and the discrepancy found in the observations. A basic assumption of the model is that spiders possess distinct inactive and active phases (biphasic activity pattern), and transitions between the two phases are regulated by the hunger level of the spider. Data from a laboratory experiment were used to examine the assumptions of the model partially. The model was able to capture patterns observed in the data, suggesting that the pattern of transitions in biphasic activity is an important trait of the foraging behavior of the jumping spider.
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Acknowledgements
I thank Ben Bolker, Jane Brockmann, Jim Hobert, Bob Holt, Craig Osenberg, Steve Phelps, Charlotte Skov, and Bob Ruyle, as well as two anonymous reviewers for their support and insightful comments. This study was partially funded by National Science Council of Taiwan (97-2321-B-002-036-MY2).
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Communicated by Tatiana Czeschlik
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Okuyama, T. Biphasic activity of a jumping spider. Naturwissenschaften 98, 15–22 (2011). https://doi.org/10.1007/s00114-010-0734-3
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DOI: https://doi.org/10.1007/s00114-010-0734-3