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Noctule trends for England

The England-level population trend for noctule from the Field Survey is shown on this page.

Population trends for noctule are also produced for Great Britain.

Field Survey

England index of noctule population from Field Surveys

Noctule bat field 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 9.0% above the 1999 base year value, equivalent to an annual increase of 0.5%. The smoothed index has been relatively stable since the start of the monitoring period and overall there has been no significant change in the smoothed index since 1999. Differences between trends for regions within England are close to significant (randomisation test P= 0.066).

From all years for which data are available (1998-2016), counts from 515 sites contributed to the trend analysis in England.

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