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Natterer's bat trends for Wales

The Wales-level population trend for Natterer's bat from the Hibernation Survey is shown below.

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


Hibernation Survey

Wales index of Natterer's bat population from Hibernation Surveys

Natterer's bat hibernation trend Wales

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 99.9% above the 1999 base year value, equivalent to an annual increase of 4.2%. The smoothed index increased steadily between 1999 and 2011, after which the rate of increase has slowed. Overall there has been a significant increase in the smoothed index since the baseline year.

From all years for which data are available (1998-2016), counts from 129 sites contribute to the trend analysis in Wales (sites surveyed in two or more years with Natterer's bat recorded in at least one year). 


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

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