Biodiversitätsfördernde Eigenschaften des Anbaus von Lein (Linum usitatissimum L.) in Agrarökosystemen

Flaxseed is the economically most important medicinal plant in Germany. It is cultivated on an area of over 2500 ha. Its pollen and/or nectar are a potential foodresource for insects in intensively used agricultural landscapes. To test this hypothesis insects on flowering flaxseed plants and the flowering environment were collected and the species and their abundance were determined. The study focused on taxa of Hymenoptera (except Formicidae) and Diptera. In addition, pollen samples were taken from wildbees and intestinal content of hoverflies was analyzed. On two out of three study sites we found higher species numbers in flaxseed than in the flowering environment. Further, more individuals of Hymenoptera were found in cultivated flaxseed compared to the neighboring environment on all three sites. Flaxseed pollen was found on Halictus sp. and Lasioglossum calceatum, indicating that these species may serve as pollinators of flax. Moreover, flaxseed pollen was found in the digestive system of Syrphus ribesii which suggests a potential role of flaxseed as a food source for this species