Eryri/ Snowdonia

Site details

UK map showing location of Eryri/ Snowdonia Special Area of Conservation/Site of Community Importance.
Location of Eryri/ Snowdonia 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

3130 Oligotrophic to mesotrophic standing waters with vegetation of the Littorelletea uniflorae and/or of the Isoëto-Nanojuncetea
Llyn Idwal, in the mountains of Snowdonia, represents oligotrophic waters (Type 3) in north Wales. It is a relatively small, shallow, upland corrie, in contrast to Llyn Cwellyn, also in Snowdonia, and complete ice cover has been recorded in winter. No overall change in the lake’s water chemistry has been found since the mid-19th century, and the water quality is considered to be high. The site has a good representation of typical plant species, including quillwort Isoetes lacustris, water lobelia Lobelia dortmanna, shoreweed Littorella uniflora, bulbous rush Juncus bulbosus, alternate water-milfoil Myriophyllum alterniflorum and intermediate water-starwort Callitriche hamulata. Bog pondweed Potamogeton polygonifolius has been recorded from stream inlets, and pillwort Pilularia globulifera is reported from this site. Emergent and floating vegetation is mainly confined to the shallow sub-basin at the south end of the site, where floating bur-reed Sparganium angustifolium forms extensive mats, alongside stands of common reed Phragmites australis, water horsetail Equisetum fluviatile and bottle sedge Carex rostrata.
6150 Siliceous alpine and boreal grasslands
Snowdonia has the best-developed and most extensive areas of Siliceous alpine and boreal grasslands in Wales and is the largest example of the habitat type south of Scotland. The principal sub-type present is U10 Carex bigelowiiRacomitrium lanuginosum moss-heath, but there are also fragments of U7 Nardus strictaCarex bigelowii grass-heath. This site is representative of the more impoverished southern variants of the habitat type.
6430 Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels
Snowdonia is the most southerly site selected and contains the most extensive and diverse examples of hydrophilous tall herb fringe communities in Wales. Fragmentary stands of the habitat type occur on pumice tuff and other base-enriched igneous rocks at a range of altitudes throughout the site. The vegetation is floristically somewhat impoverished compared with Scottish examples but includes many of the species found further north, such as globe-flower Trollius europaeus, wild angelica Angelica sylvestris and holly-fern Polystichum lonchitis. It is important as a southern outlier for arctic-alpines such as alpine saw-wort Saussurea alpina and black alpine-sedge Carex atrata. There are also some southern species, which are absent further north, for example Welsh poppy Meconopsis cambrica.
8110 Siliceous scree of the montane to snow levels (Androsacetalia alpinae and Galeopsietalia ladani)
Snowdonia is the largest site in Wales representative of siliceous scree. The site has extensive screes of igneous rocks with large stands of U21 Cryptogramma crispaDeschampsia flexuosa vegetation; associated species include fir clubmoss Huperzia selago. Bryophyte and lichen-dominated screes are also well-represented and include important populations of rare and local montane and oceanic species, such as Marsupella adusta, Marsupella stableri and Cornicularia narmoerica.
8210 Calcareous rocky slopes with chasmophytic vegetation
Snowdonia is representative of Calcareous rocky slopes with chasmophytic vegetation at one of its most southerly outposts in the UK, and contains the most extensive and diverse examples of these communities in Wales. Crevices in base-rich igneous rocks support a characteristic assemblage of plants, with a large number of arctic-alpine species. These include a number of nationally rare species, such as alpine saxifrage Saxifraga nivalis, tufted saxifrage S. cespitosa, alpine meadow-grass Poa alpina and alpine woodsia Woodsia alpina. A species of particular interest is the Snowdon lily Lloydia serotina, which in the UK occurs only in Snowdonia, in rock cracks and crevices on calcareous and more siliceous substrates, and is here at its northern limit in western Europe.
8220 Siliceous rocky slopes with chasmophytic vegetation
Snowdonia, north Wales, is representative of Siliceous rocky slopes with chasmophytic vegetation at the southern edge of the range of the habitat type. Acidic crevice communities occur throughout the site on igneous outcrops and include populations of stiff sedge Carex bigelowii, fir clubmoss Huperzia selago and forked spleenwort Asplenium septentrionale. Atlantic species, including Wilson’s filmy-fern Hymenophyllum wilsonii and a wide range of bryophytes, are also well-represented.

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
4060 Alpine and Boreal heaths
6170 Alpine and subalpine calcareous grasslands
6230 Species-rich Nardus grasslands, on silicious substrates in mountain areas (and submountain areas in Continental Europe)  * Priority feature
7130 Blanket bogs (* if active bog)  * Priority feature
7150 Depressions on peat substrates of the Rhynchosporion
7220 Petrifying springs with tufa formation (Cratoneurion)  * Priority feature
7230 Alkaline fens
7240 Alpine pioneer formations of the Caricion bicoloris-atrofuscae  * Priority feature
91A0 Old sessile oak woods with Ilex and Blechnum in the British Isles

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

1393 Slender green feather-moss  Drepanocladus (Hamatocaulis) vernicosus
This is an upland site in north Wales for Slender green feather-moss Drepanocladus vernicosus, which has been recorded in flushes up to an altitude of 450 m.
1831 Floating water-plantain  Luronium natans
Snowdonia in north Wales is an example of a montane lake habitat supporting floating water-plantain Luronium natans. Records date back to the 18th century, indicating that habitat conditions are particularly favourable for this species.

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

Not applicable.


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