Abstract
We describe a field experiment designed to evaluate indirect effects in a prey community sharing common predators. A simple prey community was mimicked with two types of artificial nests. Firstly, it was shown that predation rate increased with nest density when only a single prey was present. Secondly, it was shown that an increase in the density of one nest type increased the predation rate on another type. This is the first experimental evidence for indirect effects in vertebrate communities, which also may help to explain the strong interspecific aggression observed in some communities. In a previous treatment we had shown that there is no observer effect on nest predation in the form of density-dependent scent marking while laying out the artificial nests.
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Hoi, H., Winkler, H. Predation on nests: a case of apparent competition. Oecologia 98, 436–440 (1994). https://doi.org/10.1007/BF00324234
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DOI: https://doi.org/10.1007/BF00324234