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Soprano pipistrelle trends for Great Britain

Pipistrellus pygmaeus

Species factsheetDistribution and abundance

GB-level population trends for soprano pipistrelle from the Field Survey and the Roost Count are shown on this page.

Population trends are also produced for soprano pipistrelle at country-level for England and Scotland. There are currently insufficient data to produce population trends for this species in Wales.


Field Survey

GB index of soprano pipistrelle population from Field Surveys


Soprano pipistrelle Field 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 52.4% above the 1999 base year value, equivalent to an annual increase of 2.7%. There has been a significant increase in the smoothed index since the baseline year.

Data from 601 sites surveyed between 1998 and 2015 contribute to the trend.

 


Roost Count 

GB index of soprano pipistrelle population from Roost Counts

Soprano pipistrelle Roost Count 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 47.4% below the 1999 value, equivalent to an annual decrease of 3.9%. There has been a significant decline in the smoothed index since the baseline year. However this trend should be treated with caution as soprano pipistrelle regularly switch between different roosts, and there is evidence to suggest that this frequent roost switching can negatively bias population trends calculated from Roost Count data.

Data from 385 sites surveyed between 1997 and 2015 contribute to the trend analysis (sites surveyed in two or more years).

 


Summary of survey results

The trend from the Field Survey shows a signifcant increase in the smoothed index since the baseline year, while the trend from the Roost Count shows a significant decline. Data from the Field Survey is considered to more reliably reflect changes in bat populations than data from the Roost Count, as there is evidence to suggest that for species which regularly switch roosts trends estimated from Roost Count data can be negatively biased. As such the population of soprano pipistrelle in Great Britain is considered to have increased since 1999.

 


Distribution and abundance

Soprano pipistrelle is widely distributed across the UK with the exception of the very northern parts of Scotland. 

Population estimate 

The population estimates are considered to be poor and should be treated with caution. Estimates are based on very limited population data and rely on expert opinion only.

Country

UK

England

Wales

Scotland

N.Ireland

Number

1,300,000

unknown

unknown

 unknown

580,000

 Source

 Battersby et al. 2005
(incl. N. Ireland)

 

 

 

 Russ 1999

  


References

Battersby. J. (Ed) & Tracking Mammals Partnership. (2005) UK Mammals Species Status and Population Trends. First Report by the Tracking Mammals Partnership. JNCC/Tracking Mammals Partnership, Peterborough.

Haines-Young et al., 2000. Accounting for nature: assessing habitats in the UK countryside. Natural Environment Research Council.

Morton, D., Rowland, C., Wood, C., Meek, L., Marston, C., Smith, G., Wadsworth, R., Simpson, I. 2011. Final Report for LCM2007 - the new UK Land Cover Map: CS Technical Report No 11/07. Centre for Ecology & Hydrology.

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

 

 

Soprano pipistrelle factsheet

 

Listen to how soprano pipistrelle sounds on a bat detector 

 

 

Current distribution of soprano pipistrelle in the UK

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

Soprano pipistrelle distribution

 

 

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