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In this paper the production and consumption by spiders of the field layer was compared with that of two groups of dominant insects the leafhoppers and adult Diptera. The dynamic of production of six dominant spider species and consumption of three populations of web spiders was analyzed. The probable total production and consumption of all spiders occurring in this stratum has been calculated on the basis of these data. On natural meadow the consumption of spiders was greater than the production of the two mentioned groups of insects, while on cultivated meadows it was very small when compared with the insect production. Elimination coefficients for insects appeared to be several times lower in cultivated than in natural meadows which seems to be connected with a very low density of spiders in that habitat.
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Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.