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Serotine trends for England

England-level population trends for serotine from the Field Survey and the Roost Count are shown on this page.

Population trends for serotine are also produced for Great Britain.


Field Survey

England index of serotine population from Field Surveys

Serotine 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 4.1% above the 1999 base year value, equivalent to an annual increase of 0.2%. There has been no significant change in the smoothed index since 1999. There are no significant differences between trends for regions within England.

Data from 397 sites contribute to the trend analysis in England.


Roost Count 

England index of serotine population from Roost Counts

Serotine 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 23.2% below the 1999 base year value, equivalent to an annual decrease of 1.5%. The smoothed index declined slowly between 1999 and 2013, but in recent years has been increasing, although at no point has it differed significantly from the baseline year. Overall there has been no significant change in the smoothed index since 1999There are no significant differences in the trend over the last six years between regions within England.

Data from 94 sites contribute to the trend analysis in England (sites surveyed in two or more years).


Return to Serotine population trends; Report home page; Contents page

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