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Natterer's bat trends for England

England-level population trends for Natterer's bats from the Hibernation Survey and the Roost Count are shown on this page.

Population trends are also calculated for Natterer's bat for Great Britain and Wales.


Hibernation Survey

England index of Natterer's bat population from Hibernation Surveys

Natterer'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 89.3% above the 1999 base year value, equivalent to an annual increase of 3.8%. The smoothed index value increased steadily between 1999-2010 but has been relatively stable since then. Overall there has been a significant increase in the smoothed index since 1999.

From all years for which data are included (1998-2016), counts from 356 sites contribute to the trend analysis in England (sites surveyed in two or more years with Natterer's bat recorded in at least one year).


Roost Counts

England index of Natterer's bat population from Roost Counts

Natterer's 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 4.2% above the 2002 base year value, equivalent to an annual increase of 0.3%. There has been very little change in the smoothed index value during the period of monitoring. Overall there has been no significant change in the smoothed index since 2002. There are no significant differences between trends for regions within England, although the limited sample size means that spatial patterns are difficult to assess.

Data from 69 sites contribute to the trend analysis in England (sites surveyed in two or more years).


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

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