Abstract
An experiment was performed in order to test the hypothesis that the predation by wintering birds appreciably reduces the number of spiders on spruce branches. Autumn levels of the spider populations were measured before the start of the experiment by searching a random sample of spruce branches for spiders. The experimental branches were then enclosed by means of netting, which prevented birds from using them as feeding stations. Two types of nets were used: one coarse type through which spiders but not birds could pass and one fine type with mesh too small even for the spiders. The experiment revealed a significant effect from the elimination of predation
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