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Lesser horseshoe bat trends for Wales

Welsh-level population trends for lesser horseshoe bat from the Hibernation Survey and the Roost Counts are shown on this page.

Population trends are also calculated for lesser horseshoe bat in Great Britain and England.


Hibernation Survey

Wales index of lesser horseshoe bat population from Hibernation Surveys

Lesser horseshoe bat hibernation trend Wales

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 159.8% above the 1999 base year value, equivalent to an annual increase of 5.8%. The smoothed index has increased consistently since the baseline year and overall there has been a significant increase in the smoothed index since 1999.

From all years for which data are available (1990-2016), counts from 157 sites contribute to the trend analysis in Wales (sites surveyed in two or more years with lesser horseshoe bat present in at least one year).


Roost Counts

Wales index of lesser horseshoe bat population from Roost Counts

Lesser horseshoe bat roost count trend WalesNote: The trend for 2016 is shown as a dashed line to indicate that it is provisional. The figure shows trend analysis results (solid line) with 95% confidence limits (dotted lines).

The smoothed index is currently 71.6% above the 1999 base year value, equivalent to an annual increase of 3.2%. The smoothed index has increased consistently since the baseline year and overall there has been a significant increase in the smoothed trend since 1999.

Data from 172 sites contribute to the trend analysis in Wales (sites surveyed in at least two years).


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

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