It has been known for some time (see here) that significant numbers of capercaillie, black grouse and red grouse die in collisions with fences each year, with some studies suggesting up to 1/3 of capercaillie die in this way.  While the focus in Scotland has generally been on deer fencing, all fencing kills, a fact that seems to have been missed by the Cairngorms National Park Authority Planning Committee when they approved a new “stock” fence around the Coire na Ciste car park to deter people from walking down into the Glenmore Forest (see here). (Committee members asked about the height of the fence but not whether it would be marked).  Research has also shown that marking fences (see here) to make them more visible to grouse species reduces mortality by 60%.

Given the plight of the capercaillie, which is once again heading towards extinction in Scotland, one might have thought the single most important step that could be taken to save them would be to remove fencing in the areas where they remain.  The Cairngorms Capercaillie project has produced a very useful map showing fences in capercaillie areas (see here).  The  amount of fencing on Speyside, the last remaining stronghold for the species, is remarkable:

The position of the Forestry Commission, as it then was, back in 2012 was that “the construction of new fencing to protect woodland and trees in habitats supporting these two grouse species should be minimised, and the fences removes as soon as management objectives have been achieved”.

The only reason deer fencing is required is because high deer numbers prevent natural regeneration of woodland.  As has been shown on the Glen Feshie estate, if the management objective was to keep deer numbers at c2 per square kilometre, fences could be removed completely and woodland would regenerate naturally.  The problem is some landowners want to retain high deer numbers while also keeping the Cairngorms National Park Authority happy by expanding the extent of native woodland.  The inevitable consequence is deer fencing.

I first became aware of the extent of the fence-marking at Kinveachy on a walk three and a half years ago.  The orange plastic netting is not just a blot on the landscape, it tears in the wind leaving little bits of plastic all over the countryside.  The first orange netting used was not resistant to ultra violet light and degraded very quickly. Netting now is UV resistant and guaranteed for eight years, not a long time.  Scandalously, the Scottish Government is still providing grants to put up this plastic netting through the rural payments scheme (see here), despite worldwide concern about the amount of plastic entering the natural environment.

Part of the problem is plastic is the cheapest option, which may be why the Cairngorms Capercaillie Project gets volunteers to put wooden droppers up on deer fences within the area, saving landowners a bob or two in labour.

But if you look closely at the photo you can see the droppers are attached with plastic ties.  In fact plastic ties are being used extensively with a variety of different products used to make fencing more visible to capercaillie.

All these small bits of plastic which will inevitably enter the natural environment. Surely we should be doing better in a National Park?  One wonders how long it will be till capercaillie and black grouse start dying because they have ingested plastic?

That plastic is not necessary is shown by this example at Kinveachy.  Wire, on the lower part of the fence, and wooden battens are fixed with metal staples.

Besides cost, the other main variable which has determined what type of fencing marking is used is the wind.  Plastic netting catches the wind most and can only be used in relatively sheltered locations.  Lengths of bamboo catch the wind least and are lighter than full wooden battens but the fence may still need to be reinforced as above.