Survey Results 2016

The Devon Bat Survey results 2016 are in!

In 2016 we trialled the Devon Bat Survey. Although the survey only ran for the last 11 weeks of the season with just 10 bat detectors, the survey results show that greater horseshoe bats were recorded at 63 locations out of the 154 surveyed.

Survey Areas 2016

Survey squares 2016

The map above shows the location of the survey areas using tetrads. A tetrad is a 2km by 2km grid square used for biological recording.

The results from 2016 have helped us to target our work in 2017, providing evidence of where we should be targeting our land management advice and our research efforts.

Greater Horseshoe Bat Heat Map 2016

GHB Results 2016

This second map shows the hotspots of greater horseshoe activity in 2016, with the strongest colours showing where more than fifty greater horseshoe passes occurred.

In total over 300,000 sound files were recorded.

As the survey progresses we hope to compile a set of cumulative maps for all years.

Whilst we have some great technological aids for helping us to work out which are bats (and which are birds, crickets and general noise), we still need to manually check lots of the files. As you can imagine, it takes a huge amount of time to process the survey results.

We will be posting a further map showing the number of species recorded in each tetrad later in the spring, so please watch this space.

To take part in next year’s survey keep an eye on the Devon Bat Survey page – bookings will open during March 2018.

Useful links;

To see the 2017 results click here

For an overview of what’s involved have a look at the volunteer instructions