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Daubenton's bat trends for Great Britain

Myotis daubentonii

Species factsheetDistribution and abundance

GB-level population trends for Daubenton's bat from the Hibernation Survey and the Waterway Survey are shown on this page.

Population trends are also produced for Daubenton's bat at a country-level for EnglandScotland and Wales.

 


Hibernation Survey

GB index of Daubenton's bat population from Hibernation Surveys

Daubenton's bat hibernation survey trend GB

Note: The graph above shows the unsmoothed index value for each year (green crosses), the smoothed trend (solid line) and 95% confidence intervals (dotted lines). The smoothed trend for 2016 is shown as a dashed line to indicate that it is provisional.

The smoothed index is currently 47.7% above the 1999 base year value, equivalent to an average annual increase of 2.3%. Between 1999 and 2012 the index value did not differ significantly from the baseline year, however as a result of several high average counts between 2013-2016 the trend is now increasing. Overall there has been a statistically significant increase in the smoothed index since the baseline year. There are no significant differences between trends for England and Wales.

From all years for which data are available (1998-2016) counts from 399 sites contribute to the overall trend analysis (sites surveyed in two or more years with Daubenton's bat present in at least one year). 


Waterway Survey

GB index of Daubenton's bat population from Waterway Surveys

Daubentons bat trend great britain 2016 waterway survey

Note: The graph above shows the unsmoothed index value for each year (green crosses), the smoothed trend (solid line) and 95% confidence intervals (dotted lines). The smoothed trend for 2016 is shown as a dashed line to indicate that it is provisional.

The smoothed index is currently 1.6% above the 1999 base year value, equivalent to an average annual increase of 0.1%. Since the start of monitoring the index value has remained close to the baseline year, and overall there has been no significant change in the smoothed index since the baseline year. There are no significant differences between trends for England, Scotland and Wales.

Data from 848 sites surveyed between 1998 and 2016 contribute to the GB trend.

In Ireland the Waterway Survey is co-ordinated by Bat Conservation Ireland. Results can be found here.

 


Summary of survey results

For Daubenton's bat the Waterway Survey shows no overall trend since the baseline year of monitoring, whereas the Hibernation Survey trend has increased significantly from 2013 onwards. Of the two surveys, the Waterway Survey is considered to be a more accurate measure of population change (see Robustness of Monitoring), therefore the population of Daubenton's bat in Great Britain is considered to have been stable since 1999, although the divergence between the two trends will continue to be monitored and investigated as further years of data become available.

 


Distribution and abundance

Daubenton's bat is relatively common and widespread across the UK. 

Population estimate

The population estimates are considered to be poor and should be treated with caution. Estimates are based on very limited or no population data and rely on expert opinion only

Country

UK

England

Wales

Scotland

N.Ireland

Number

560,000

95,000

15,000

40,000

410,000

 Source

 

 Harris et al. 1995

 Harris et al. 1995

 Harris et al. 1995

 Russ 1999

 


 

References

Harris S., Morris, P., Wray, S. & Yalden, D. (1995) A review of British mammals: population estimates and conservation status of British mammals other than cetaceans. JNCC, Peterborough.

Russ, J.M. 1999. The Microchiroptera of Northern Ireland: community composition, habitat associations and ultrasound. Unpublished PhD thesis. Queen’s University, Belfast.

 


Return to:

Top of pageSpecies population trendsReport HomeContents page

 

 

 

 

Daubenton's bat factsheet

 

Listen to how Daubenton's bat sounds on a bat detector 

 

 

Current distribution of Daubenton's bat in the UK

(Map taken from 3rd Report under Article 17 on implementation of the Habitats Directive in the UK, JNCC 2013)

Daubenton's bat distribution

 

 

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