The National Barbastelle and Bechstein’s Survey (NBBS)

The National Barbastelle and Bechstein’s Survey (NBBS) has been set up in collaboration with Vincent Wildlife Trust to refine our understanding of the ecology of Barbastelle and Bechstein’s bats and has a number of objectives. These include:

• refining our understanding on the edge of the species’ range
• investigating occupancy within the known range (including any range shifts)
• assessing how habitats and roost features can be assessed accurately for species suitability.

Within this national survey, we aim to identify location and methodologies to improve, connect and expand habitats and will include looking at the influence of woodland/habitat structure as well as the importance of swarming sites within the landscape.

Barbastelle and Bechstein’s bat are strictly protected woodland specialists that rely on semi-natural ancient woodland. However, as just 2.5% of the UK is covered in ancient woodland, the availability of suitable woodland roosting habitat is likely to be an important factor in limiting the size and distribution of these woodland specialist bat populations.

Increased urbanisation, land use change and man-made impacts such as light pollution are also thought to have serious negative effects on these species with increased habitat fragmentation leading to a loss of foraging and roosting habitat. The unique and essential habitats present in ancient woodlands can take centuries to create and therefore cannot be replaced quickly, which places both species at great risk from any activity that impacts ancient woodland.

Until now there has never been a national survey undertaken for Barbastelle bats and the last national Bechstein’s bat survey requires updating to reflect known range expansions. By gathering this information, we can more accurately inform Nature Recovery Networks (NRN) and Local Nature Recovery Strategies (LNRS) regarding these rare woodland bats. Furthermore, a more comprehensive understanding of these species will allow for more accurate evaluations of negative impacts posed by development plans.

We are calling for any unpublished data, research, confirmed records or other information in relation to the presence of either Barbastelle or Bechstein’s bats encountered on any surveys, particularly in woodland settings.

If you or your organisation has any information that you would be willing to share with us to inform either of these projects, please contact Jack Hooker at jhooker@bats.org.uk where we can discuss the possibilities further.