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Self-made shelters protect spiders from predation. | LitMetric

Self-made shelters protect spiders from predation.

Proc Natl Acad Sci U S A

School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia.

Published: September 2008

AI Article Synopsis

Article Abstract

Many animals modify their environments, apparently to reduce predation risk, but the success of such endeavors, and their impact on the density and distribution of populations, are rarely rigorously demonstrated. We staged a manipulative experiment to assess the effectiveness of self-made shelters by web spiders as protection from natural enemies. Scincid lizards were included or excluded from 21 replicated 200-m(2) plots, and spiders therein were classified as exposed or sheltered, depending on whether they were uncovered in their web or hidden in cocoons, leaves/debris, or burrows. We found that exposed spiders were greatly affected by the presence of predatory scincid lizards, whereas sheltered spiders were not. More specifically, lizards, which forage close to the ground, reduced the abundance of exposed spiders by two-thirds but had no effect on the abundance of sheltered spiders. Sheltered spiders were able to avoid predation and share space with lizards, suggesting that shelter construction is a mechanism for reducing predation risk and has important population consequences.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2567465PMC
http://dx.doi.org/10.1073/pnas.0807107105DOI Listing

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