Ben Alder and Aonach Beag

Site details

UK map showing location of Ben Alder and Aonach Beag Special Area of Conservation/Site of Community Importance.
Location of Ben Alder and Aonach Beag SAC/SCI/cSAC
 

Note:

When undertaking an appropriate assessment of impacts at a site, all features of European importance (both primary and non-primary) need to be considered.

Annex I habitats that are a primary reason for selection of this site

4060 Alpine and Boreal heaths
Ben Alder and Aonach Beag represents Alpine and Boreal heaths in the central Scottish Highlands. A wide range of heaths form extensive stands, including H13 Calluna vulgaris Cladonia arbuscula, H19 Vaccinium myrtillus Cladonia arbuscula, H20 Vaccinium myrtillus Racomitrium lanuginosum and H22 Vaccinium myrtillus Rubus chamaemorus heaths. The representation of reindeer Cladonia lichens and woolly fringe-moss Racomitrium lanuginosum is intermediate, respectively, between the eastern and western Highlands. The rockier heaths provide suitable habitat for eastern outlying stations of northern Atlantic liverworts.
4080 Sub-Arctic Salix spp. scrub
This site in the central Highlands is selected to represent high-altitude (950m) Sub-Arctic Salix spp. scrub on highly calcareous schist and limestone. It has the largest known population in the UK of woolly willow Salix lanata, the rarest of the sub-Arctic willows. Downy willow S. lapponum and net-leaved willow S. reticulata are frequent, and whortle-leaved willow S. myrsinites is also represented. The willows are associated with an area of 6170 Alpine and subalpine calcareous grasslands on steep, rocky and remote ground.
6150 Siliceous alpine and boreal grasslands
These ranges of hills have the largest area of ground above 1000m in Britain outside of the Cairngorms and the extent of Siliceous alpine and boreal grassland is correspondingly high. The range of communities is representative of the higher hills of the central Highlands, with all the NVC types associated with the habitat represented. The most extensive communities are U7 Nardus stricta Carex bigelowii grass-heath and U10 Carex bigelowii Racomitrium lanuginosum moss-heath, the latter with an unusual occurrence of a species-rich sub-type following a band of high-altitude limestone. This site represents one of only six sites outside of the Cairngorms and Ben Nevis with extensive late-lie mossy snow-beds holding U11 Polytrichum sexangulare Kiaeria starkei and U12 Salix herbacea Racomitrium heterostichum snow-bed communities. Various rare plants occur in the snow-beds, including starwort mouse-ear Cerastium cerastoides and the bryophytes Dicranum glaciale, Marsupella condensata and Nardia breidleri. U8 Carex bigelowii Polytrichum alpinum sedge-heath attains its largest extent outside of the eastern Highlands.
6170 Alpine and subalpine calcareous grasslands
Ben Alder and Aonach Beag is representative of high-altitude Alpine and subalpine calcareous grasslands in the central Highlands, where the habitat is very local owing to the infrequent occurrence of calcareous rocks at high altitude. Both CG12 Festuca ovina Alchemilla alpina Silene acaulis dwarf-herb and CG14 Dryas octopetala Silene acaulis ledge communities are well-represented, especially the latter. The widespread arctic-alpines purple saxifrage Saxifraga oppositifolia and yellow saxifrage S. aizoides are frequent, while rarer species that are widespread on the site include cyphel Minuartia sedoides, alpine meadow-grass Poa alpina, hair sedge Carex capillaris, black alpine-sedge C. atrata and alpine speedwell Veronica alpina. Unusually, grazing levels appear to be low enough to allow the development of mountain avens heath on slopes open to grazing animals. The low grazing levels also allow the exceptional development of moderately large populations of montane willows, including woolly willow Salix lanata, conforming to AnnexI type 4080 Sub-Arctic Salix spp. scrub, for which the site is also selected. The transition between these two habitat types is unusual.
7240 Alpine pioneer formations of the Caricion bicoloris-atrofuscae  * Priority feature
Ben Alder and Aonach Beag is representative of high altitude flushes in the central Highlands. Both open flushes of M11Carex demissa Saxifraga aizoides mire and more closed flushes of M12Carex saxatilis mire are well-represented. The flushes are well-developed but localised and are notable for the occurrence of the rare scorched alpine-sedge Carex atrofusca, which is known to occur in only two other locations in the SAC series. Other characteristic species include three-flowered rush Juncus triglumis, Scottish asphodel Tofieldia pusilla, sheathed sedge Carex vaginata, alpine bistort Persicaria vivipara and the moss Blindia acuta. Other uncommon species include hair sedge Carex capillaris and alpine cats-tail Phleum alpinum.
8110 Siliceous scree of the montane to snow levels (Androsacetalia alpinae and Galeopsietalia ladani)
This site is one of the best sites for siliceous scree in the central Highlands. The site has extensive base-poor schistose screes developed at moderate to high altitude. Where snow lies late there is an extensive development of U18 Cryptogramma crispa Athyrium distentifolium snow-bed community. Within these snow-beds the endemic Newmans lady fern Athyrium flexile occurs. The oceanic montane liverworts Scapania nimbosa, Lophozia opacifolia, Mylia taylorii and Bazzania tricrenata occur in one of their few eastern outliers in these rocky snow-beds. Siliceous scree also occurs extensively at lower levels.
8210 Calcareous rocky slopes with chasmophytic vegetation
Ben Alder and Aonach Beag has an outstanding flora of rare arctic-alpine calcicoles mostly associated with a high-altitude band of limestone at 900-1000m. The flora includes tufted saxifrage Saxifraga cespitosa, alpine saxifrage S. nivalis, hoary whitlowgrass Draba norvegica, mountain avens Dryas octopetala, black alpine-sedge Carex atrata and alpine meadow-grass Poa alpina. Various rare montane calcicolous mosses and lichens also occur on the rock faces.

Annex I habitats present as a qualifying feature, but not a primary reason for selection of this site

4010 Northern Atlantic wet heaths with Erica tetralix
4030 European dry heaths
6430 Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels
7130 Blanket bogs (* if active bog)  * Priority feature
8220 Siliceous rocky slopes with chasmophytic vegetation

Annex II species that are a primary reason for selection of this site

Not applicable.

Annex II species present as a qualifying feature, but not a primary reason for site selection

Not applicable.


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