MENUMENU

Survey Results 2018

The Devon Bat Survey results 2018 are in!

Thank you to all the participants in the 2018 Devon Bat Survey. With your help we recorded greater horseshoe bats at 270 sites out of the 728 which were surveyed! If you took part and haven’t received your report yet please check your junk folders; if nothing is there then email bats@devonwildlifetrust.org

The map below uses tetrads to show the location of the survey areas. Although people selected a 1km grid square to deploy their detector, the map below shows a tetrad square to make it easier to view. A tetrad is a 2km by 2km grid square used for biological recording.

Survey Areas 2018

This incredible effort will help us to focus our work in key areas. It will assist both in terms of further research and targeted land management advice.

The second map (below) shows ‘hotspots’ or the density of greater horseshoe bats recorded. This is only based on the sites surveyed. It does not mean that if an area of the map doesn’t show any greater horseshoes that they do not occur here. The strongest colours show where there were over 25 greater horseshoe passes in one location, a great result! As the survey progresses we hope to compile a set of cumulative maps for all years.

Greater Horseshoe Bat heat Map 2018

In total the survey recorded over 750,000 sound files. 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, this takes a huge amount of time!

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.

Later in the spring, we will produce a further map showing the number of species recorded in each tetrad, so 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 2019.

Useful links;

To see the 2016 results click here

To see the 2017 results click here

If you’re interested in taking part next year, you could read the volunteer instructions  for an overview of what’s involved.

Devon Greater Horseshoe Bat Project