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Summary of trends for England, Scotland and Wales

This page provides a summary of the country-level population trends for bat species monitored by the NBMP. Population trends are produced at a country-level for England, Scotland and Wales for species and survey types where sufficient data are available. Further details of survey coverage in these countries and the power of these data to detect country-level population changes is given here. There are currently insufficient data from Northern Ireland to be able to report on trends at the country-level or include them with data from the rest of the UK to produce UK trends. Information on how bats are faring in Ireland can be found on the Bat Conservation Ireland website

Click on the species names in the tables below to access the following information:

  • The species population trends at country-level
  • Graphs showing the trends calculated from each survey
  • The surveys that provide data for that species

Jump to trends in England; Scotland; Wales

Information about the factors that affect our bat populations can be found here

England

The table below shows a summary of the bat species trends derived from NBMP survey results in England to the end of 2016. For each species, the number of sites contributing to the 2016 trend calculations is shown as well as an approximation of the average annual percentage change since the baseline year. It should be noted, however, that the average annual percentage change makes assumptions about the data analysis, and is only genuinely appropriate for those species for which the trend line appears to be linear.

England bat species population trends summary table

Species 

Survey type 

No. sites trend analysis 

Base year

Long-term trend (since base year) %

Average annual change %

Greater horseshoe bat 

Hibernation

Roost

104

27

1999

1999

181.9*

118.7*

6.3

4.7

Lesser horseshoe bat 

Hibernation

Roost

142

113

1999

1999

154.9*

114.1*

5.6

4.6

Daubenton's bat

Hibernation

Waterway 

286

684

1999

1999

55.9*

-7.9

2.7

-0.5

Whiskered/Brandt's bat

Hibernation 

151

1999

48.5

2.4

Natterer's bat

Hibernation

Roost

356

69

1999

2002

89.3*

4.2

3.8

0.3

Common pipistrelle 

Field

Roost

515

388

1999

1999

96.6*

-54.3*

4.1

-4.5 

Soprano pipistrelle

Field

Roost

515

244

1999

1999

 32.7

-50.1*

 1.7

-4

Noctule

Field

515

1999

 9.0

 0.5

Serotine

Field

Roost

397

94

1999

1999

4.1

-23.2

0.2

-1.6

Brown long-eared bat

Hibernation

Roost

325

113

1999

2001

-22.0

-3.5

-1.5

-0.2

Notes: * indicates significant result at 5% (Bold indicates which trend is considered to be most statistically robust if two trends are produced). 

 

Scotland

The table below shows a summary of the bat species trends derived from NBMP survey results in Scotland to the end of 2016. For each species, the number of sites contributing to the 2016 trend calculations is shown as well as an approximation of the average annual percentage change since the baseline year. It should be noted, however, that the average annual percentage change makes assumptions about the data analysis, and is only genuinely appropriate for those species for which the trend line appears to be linear.

Scotland bat species population trends summary table

Species 

Survey type 

No. sites trend analysis 

Base year

Long-term trend (since base year) %

Average annual change %

Daubenton's bat

Waterway 

115

1999

22.7

1.2

Common pipistrelle 

Field

Roost

76

64

1999

1999

19.5

-63.3*

1.1

-5.7

Soprano pipistrelle

Field

Roost

76

83

1999

1999

54.1

-50.0*

 2.6

-4.0

Notes: * indicates significant result at 5% (Bold indicates which trend is considered to be most statistically robust if two trends are produced). 

 

Wales

The table below shows a summary of the bat species trends derived from NBMP survey results in Wales to the end of 2016. For each species, the number of sites contributing to the 2016 trend calculations is shown as well as an approximation of the average annual percentage change since the baseline year. It should be noted, however, that the average annual percentage change makes assumptions about the data analysis, and is only genuinely appropriate for those species for which the trend line appears to be linear.

Wales bat species population trends summary table

Species 

Survey type 

No. sites trend analysis 

Base year

Long-term trend (since base year) %

Average annual change %

Greater horseshoe bat 

Hibernation

93

1999

101.4

4.2

Lesser horseshoe bat 

Hibernation

Roost

157

172

1999

1999

159.8*

71.6*

5.8

3.2

Daubenton's bat

Hibernation

Waterway 

88

47

1999

2000

28.8

34.7*

1.5

1.9

Whiskered/Brandt's bat

Hibernation 

78

1999

-4.2

-0.3

Natterer's bat

Hibernation

129

1999

94.9*

4.2

Brown long-eared bat

Hibernation

81

1999

36.3

1.8

Notes: * indicates significant result at 5% (Bold indicates which trend is considered to be most statistically robust if two trends are produced).

 

Return to Summary of trends in GB; Report home; Contents page 

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