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Greater horseshoe bat trends for England

English-level population trends for greater horseshoe bat from the Hibernation Survey and Roost Count are shown on this page.

Population trends are also calculated for greater horseshoe bat for Great Britain and Wales.


Hibernation Survey

England index of greater horseshoe bat population from Hibernation Surveys

Greater horseshoe bat hibernation trend England

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 181.9% above the 1999 base year value, equivalent to an annual increase of 6.3%. The smoothed index has fluctuated over the monitoring period, but has been steadily increasing since 2011. Overall there has been a significant increase in the smoothed index since the baseline year. 

From all years for which data are available (1990-2016), counts from 104 sites contribute to the trend analysis in England (sites surveyed in two or more years with greater horseshoe bat present in at least one year).


Roost Counts

England index of greater horseshoe bat population from Roost Counts

Greater horseshoe bat roost trend England

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 trend is currently 118.7% above the 1999 base year, equivalent to an annual increase of 4.7%. The smoothed index has increased consistently since the baseline year. Overall there has been a significant increase in the smoothed index since the baseline year.

From all years for which data are available (1997-2016), counts from 27 sites contribute to the trend analysis in England (sites surveyed in at least two years).


Return to Greater horseshoe bat population trends; Report home page; Contents page

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