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Nathusius' Pipistrelle Survey results

In the six years of the Nathusius’ pipistrelle Survey (2009-2014), 212 volunteers took part, surveying 261 sites.

Nathusius’ pipistrelle presence was verified through sound analysis of recordings made at 83 sites (32% of sites surveyed). A further 94 sites (36% of sites surveyed) had possible but unconfirmed Nathusius' pipistrelle records. These include sites where Nathusius' pipistrelle was reported to be heard in the field but recordings were not made that would enable verification of species presence, and where recordings were made but species identification could not be confirmed.

Distribution of Nathusius’ pipistrelle Survey sites 2009-2014

Nathusius' pipistrelle survey results 2009-2014

The table breaks down the number of sites by regions, showing how frequently the presence of Nathusius' pipistrelle was verified. Sites were surveyed for a varying number of years during the survey period.

 Region/country Total no of sites surveyed Sites with analysed recordings from broadband detectors
No of sites No of sites with Nathusius' pipistrelle verified  % sites with Nathusius' pipistrelle verified
East Midlands 19 12 5 41.7
East of England 29 23 11 47.8
Greater London 17 15 12 80.0
North East 22 15 10 66.7
North West 23 17 7 41.2
Northern Ireland 8 7 4 57.1
Scotland 28 22 4 18.2
South East 38 30 14 46.7
South West 20 15 5 33.3
Wales 20 15 3 20
West Midlands 23 19 4 21.1
Yorkshire and The Humber 14 10 4 40.0

Although data are still quite limited, there are indications that Nathusius' pipistrelle may be relatively widespread across lakes in some regions in the autumn. Greater London currently shows the highest percentage of sites with analysed recordings that had verified records (80.0%) followed by North East (66.7%), and Northern Ireland (57.1%).

All other regions/countries had less than 50% of sites with verified records, but all had at least three sites with Nathusius' pipistrelle confirmed.

Thank you to everyone who took part in this survey.


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