Driven grouse shooting may provide a net conservation benefit to Scotland’s mountain hare population.
The analyses conducted by the Game & Wildlife Conservation Trust and published in the European Journal of Wildlife Research concludes that: ‘it is likely that driven grouse shooting provides a net conservation benefit to Scotland’s mountain hare population.’
The study examined mountain hare counts over a 16-year period from 2001 to 2017, these being undertaken concurrently with annual spring grouse counts within 76 sample blocks across Highland, Grampian and Tayside.
Pointing dogs were used to search blocks of moorland for grouse, with mountain hares observed being recorded to calculate an index of their density.
The study period has enabled GWCT to describe different intensities of cyclic hare population change between regions.
The study confirmed previously reported positive associations between management for driven grouse shooting and hares, predator control being considered a major factor in determining mountain hare abundance.
Studies by others have shown that foxes can account for up to 90 per cent of hare mortality, and reductions of generalist predators such as foxes and stoats by gamekeepers probably improve hare survival, whilst strip burning to promote new heather growth may help hare diet.
Within two of the study areas, Grampian and Highland, ‘hare abundance was significantly higher on driven grouse moors than on moors managed for walked-up shooting, or where there was no shooting interest.’
In the third area, Tayside, although a lower abundance was noted, indices remained ‘relatively stable’ on driven moors compared to declines of 40 per cent per annum on non-grouse moors. Lower abundance may be a consequence of fragmentation of moorland habitats and afforestation during the late 20th century which has created upland landscapes less suitable for mountain hares.
Dr Nick Hesford, GWCT, lead author of the study, said: ‘Our findings contrast with the conclusion of recent declines on moors managed for driven grouse shooting recently reported by the Centre for Ecology & Hydrology and the RSPB.
‘Average abundance indices for Highland at 10.6 hares per sq km and Grampian at 10.1 per sq km are broadly in line with those reported in 1951 for the central Highlands.’
The GWCT data refutes the assertion that hare culling on driven grouse moors has an overall impact on the Scottish mountain hare population.
Instead, they found that abundance indices were higher on moors where driven grouse shooting takes place, and less so where grouse were walked-up or not shot at all.
The benefits of grouse moors to hare populations, probably from fewer predators and better foraging, appear to outweigh the disbenefits from sporting harvest of hares or tick-related culls, and driven grouse estates seem to provide a net conservation benefit to our mountain hare populations.
The article published in European Journal of Wildlife Research Spatial and temporal variation in mountain hare (Lepus timidus) abundance in relation to red grouse (lagopus lagopus scotica) management in Scotland is available online at http://dx.doi.org/10.1007/s10344-019-1273-7
A read-only version of the article can be found here https://rdcu.be/buWkx.
A mountain hare (Photo: Pace Productions)