Insecticiden, landschap en biodiversiteit –Gevolgen van insecticidengebruik in de wijdere omgeving voor nuttige insecten in akkerranden
Lieneke Bakker, Wopke van der Werf & Felix Bianchi
Insecticiden, habitat, geleedpotigen, biodiversiteit, plaagregulatie
Gewasbeschermingsmiddelen worden in de landbouw veel gebruikt om oogstverliezen te voorkomen. Maar tot hoe ver in de wijdere omgeving heeft het gebruik van deze middelen invloed op insectenpopulaties? Daarover is nog weinig bekend, terwijl deze informatie essentieel is voor het inschatten van milieurisico’s en de formulering van beleid.
Summary: Insecticides, landscape and biodiversity: Implications of insecticide use in the landscape on beneficial arthropods in field margins -Insecticides, semi-natural habitat, arthropods, biodiversity, pest control
The impacts of local and landscape-wide insecticide use are still poorly understood, and it is unclear to what extent impacts of insecticides on beneficial arthropod populations are moderated by landscape composition. We assessed how the abundance of predators, parasitoids, and pollinators are influenced by local and landscape-wide insecticide use across landscapes that span a range in proportion of semi-natural habitat. Abundances of beneficial arthropods in field margins, assessed by sweep-netting, were negatively associated with estimated quantity insecticide applied at the landscape scale. At the local scale, pollinator abundance was negatively associated with conventional management and with the frequency of insecticide applications in the adjacent field, while predator and parasitoid abundance did not show significant associations with local insecticide use indicators. We did not find support for the hypothesis that diverse landscapes with higher proportions of semi-natural habitats moderate negative impacts of insecticide use.
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