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Sown wildflower areas (SWA) are cultivated in Switzerland to preserve and enhance farmland biodiversity. Here, the impact of SWA on spider density, diversity and species richness in winter wheat fields was studied. Edge effects and field scale effects of SWA were compared with landscape effects of perennial habitats in general. Adjoining SWA enhanced the densities of crab spiders (Thomisidae), ground...
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