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Daubenton's bat trends for Wales

Welsh-level population trends for Daubenton's bat from the Hibernation Survey and the Waterway Survey are shown on this page.

Population trends are also calculated for Daubenton's bat for Great BritainEngland and Scotland.


Hibernation Survey

Wales index of Daubenton's bat population from Hibernation Surveys

Daubenton's 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 28.8% above the 1999 base year value, equivalent to an annual increase of 1.5%. There has been no significant change in the smoothed index since 1999.

From all years for which data are available (1990-2016), counts from 88 sites contribute to the trend analysis in Wales (sites surveyed in two or more years with Daubenton's bat recorded in at least one year). 


Waterway Survey

Wales index of Daubenton's bat population from Waterway Surveys

Daubenton's bat waterway survey 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 34.7% above the 2000 base year value, equivalent to an annual increase of 1.9%. Between 2000 and 2012 the smoothed index did not differ significantly from the baseline year, however the index has been increasing since 2009 and from 2013 onwards it has been significantly higher than the baseline year. Currently the smoothed index is signifcantly higher than in 2000.

Data from 47 sites contribute to the trend analysis in Wales.


Return to Daubenton's bat population trends; Report home page; Contents page

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