Project lead: André Rey
Background
115 wild bee species currently occur in the vineyards of the Hallauerberg, more than a dozen of them on the Red Lists, and some of them hardly found anywhere else in Switzerland. As a review of effectiveness in 2023 showed, the resources these target species need are not available in sufficient quantity every year. Their populations are therefore small and fragile in places. The unique wild bee community of the Hallauerberg is to be preserved, strengthened and secured in the long term through this conservation project.
Photo: The mustard mining bee (Andrena agilissima) is classed as endangered. It is one of the target species of the Hallauerberg that specialise in brassicas (photo: © Jürg Sommerhalder).
The following target species are to be supported as a priority:
- Senf-Blauschillersandbiene (Andrena agilissima), Gefährdungsstatus: EN
- Alfkens Zwergsandbiene (Andrena alfkenella), Gefährdungsstatus: NT
- Bärtige Sandbiene (Andrena barbilabris), Gefährdungsstatus: NT
- Glanzlose Riefensandbiene (Andrena distinguenda), Gefährdungsstatus: CR
- Punktierte Zwergsandbiene (Andrena nana), Gefährdungsstatus: VU
- Grubenhummel (Bombus subterraneus), Gefährdungsstatus: NT
- Dreizahn-Stängelbiene (Hoplitis tridentata), Gefährdungsstatus: VU
- Sandrasen-Maskenbiene (Hylaeus angustatus), Gefährdungsstatus: NT
- Glockenblumen-Schmalbiene (Lasioglossum costulatum), Gefährdungsstatus: NT
- Runzelwangige Schmalbiene (Lasioglossum puncticolle), Gefährdungsstatus: NT
- Grosse Salbei-Schmalbiene (Lasioglossum xanthopus), Gefährdungsstatus: VU
- Getrennte Wespenbiene (Nomada distinguenda), Gefährdungsstatus: NT
- Kohls Wespenbiene (Nomada kohli), Gefährdungsstatus: VU
A striking number of the species occurring here depend on structures typical of vineyards: pioneer areas with good stands of large-flowered brassicas, areas of succession, and sparsely vegetated banks and erosion edges. As a review of effectiveness showed, these elements are not available on a larger scale every year, and the populations of the typical species are often fragile. Further requirements arising from these species are taken into account in the planning.
The unique wild bee community of the Hallauerberg is to be preserved, strengthened and secured in the long term through this conservation project.
Photo: The discovery of the critically endangered Andrena distinguenda in the Schaffhausen Klettgau may be regarded as a sensation. It is the most important target species at the Hallauerberg. (Photo: © André Rey).
The following foundations and institutions support this project:
