Sand lenses are a simple and effective method of supporting ground-nesting bee species. By providing suitable nesting sites, they contribute to the conservation and promotion of biodiversity and strengthen pollination services, which are essential for many ecosystems and agricultural systems. The implementation of such measures can make a positive contribution to bee conservation in both urban and rural areas.
Advantages of sand lenses
- Pollination performance: A larger bee population can lead to better pollination of crops and wild plants.
- Promotion of biodiversity: By providing nesting sites, sand lenses support the diversity of bee species.
Importance of sand lenses for bees
- Nesting sites: Many bee species, especially solitary species such as sand bees, nest in the ground. Sand lenses provide these bee species with suitable places to dig their nests and lay their eggs.
- Protection from enemies: By digging nests in sand lenses, bees can better protect their brood from natural predators such as birds and other insects.
- Microclimate: Sand lenses create a specific microclimate that is beneficial for the development of bee larvae. The sandy soil keeps moisture and temperature stable, which is crucial for the development of the larvae.
Creation of sand lenses
- Site selection: The location for sand lenses should be sunny and protected from strong winds. A slightly elevated spot prevents waterlogging and ensures good drainage.
- Soil preparation: The soil should be well-drained and low in organic matter. Sand lenses usually consist of fine, dry sand, sometimes mixed with a little loam to ensure stability.
- Size and shape: The size of the sand lenses can vary, but they are typically at least one square metre in size. The depth should be at least 30 cm to provide sufficient space for the nests.
- Maintenance: Sand lenses require little maintenance, but should be checked regularly for weeds and compaction. If necessary, new sand can be added to maintain the structure..