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Daubenton's bat trends for England

English-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 Great Britain, Scotland and Wales


Hibernation Survey

England index of Daubenton's bat population from Hibernation Surveys

Daubenton's 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 55.9% above the 1999 base year value, equivalent to an annual increase of 2.7%. Between 1999-2013 the index value did not differ significantly from the baseline year however it has increased in recent years and since 2014 it has been significantly higher than the baseline year. Overall there has been a significant increase in the smoothed index since 1999. 

From all years for which data are available (1993-2016), counts from 286 sites contribute to the trend analysis in England (sites surveyed in two or more years with Daubenton's bat present in at least one year).


Waterway Survey

England index of Daubenton's bat from the Waterway Survey

Daubenton's bat waterway 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 7.9% below the 1999 base year value, equivalent to an annual decrease of 0.5%. The smoothed index has been slowly declining since 2007 but does not yet differ significantly from the baseline year. Overall there has been no significant change in the smoothed index since 1999. There are no significant differences between trends for regions within England over the last six years.

Data from 684 sites contribute to the trend analysis in England.


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

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