Need help with a bat?

Follow our advice

or call us on 0345 1300 228

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 GB 2015

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 2015 is shown as a dashed line to indicate that it is provisional.

The smoothed index is currently 40.2% above the 1999 base year value, equivalent to an average annual increase of 2.1%. Between 1999 and 2012 the trend was stable, however high average counts in 2012, 2013 and 2015 have seen the trend begin to increase. Overall there has been a statistically significant increase in the smoothed index since the baseline year, however this result is heavily influenced by the smoothed value of the index in the current year (2015), which is provisional until an additional year of data is added to the trend and the smoothed value can be estimated more precisely. A such further years of data are needed to confirm whether this trend will be sustained.

From all years for which data are available (1998-2015) counts from 401 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 2015 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 2015 is shown as a dashed line to indicate that it is provisional.

The smoothed index is currently 4.6% above the 1999 base year value, equivalent to an average annual increase of 0.3%. The trend has remained stable since montoring began. There has been no significant change in the smoothed index since the baseline year.

Data from 822 sites surveyed between 1998 and 2015 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

The trend from the Hibernation Survey shows an increase in the smoothed index since the baseline year that is just significant, while the trend from the Waterway Survey shows no significant change. This provides some evidence that populations of Daubenton's bats have increased since 1999, however as this increase has been seen from only one of the two surveys that monitor Daubenton's bats, and is heavily influenced by the value of the smoothed index from the current year, further years of data are required to confirm the trend.

 


Distribution and abundance

The Daubenton's bat is fairly widespread across the UK and is found up to northern Scotland and in Northern Ireland. 

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

 

 

You should follow us
Bookmark and Share
 
E-bulletin

Subscribe today to receive the latest on bats and BCT direct to your inbox.

Bat Helpline

0345 1300 228