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Brown long-eared bats trends for England

England-level population trends for brown long-eared bat from the Hibernation Survey and the Roost Count are shown on this page.

Population trends are also produced for brown long-eared bat for Great Britain and Wales.


Hibernation Survey

England index of brown long-eared bat population from Hibernation Surveys

Brown long-eared 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 22.0% below the 1999 base year value, equivalent to an annual decrease of 1.5%. The smoothed index has fluctuated above and below the baseline year but there has been no significant change in the smoothed index since 1999.

For all years for which data are available (1998-2016), counts from 325 sites contribute to the trend analysis in England (sites surveyed in two or more years with brown long-eared bat recorded in at least one year).


Roost Counts

England index of brown long-eared bat population from Roost Counts

Brown long-eared 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 index is currently 3.5% below the 2001 base year value, equivalent to an annual decrease of 0.2%. Overall there has been no significant change in the smoothed index since 2001. There are no significant differences between trends for regions within England.

Data from 113 sites contribute to the trend analysis in England (sites surveyed in at least two years).


Return to Brown long-eared bat population trends; Report home page; Contents page

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