West Dorset Alder Woods
Location of West Dorset Alder Woods SAC/SCI/cSAC
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
|91E0 Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae) * Priority feature|
|Mixed ash-alder Fraxinus excelsior - Alnus glutinosa woods are a characteristic feature of the sinuous valley woods developed along the headwaters of alkaline streams and seepages having their origin in the chalk downland and issuing from the underlying Upper Greensand at its junction with the Gault Clay. The woods vary from those with greater tussock-sedge Carex paniculata, remote sedge C. remota, hemlock water-dropwort Oenanthe crocata, opposite-leaved golden-saxifrage Chrysosplenium oppositifolium and alternate-leaved golden-saxifrage C. alternifolium, to transitions to drier oak-ash woodland with ramsons Allium ursinum. Several of the component sites are associated with valley mires with transitions to fen, reedswamp, fen meadow and acid grassland. Characteristic features of the woods are the shallow silty peats and tufa deposits which support an important assemblage of specialised invertebrates. The streams have natural meanders, back channels and debris dams, features that are otherwise rare in the lowlands. Ancient stands of ash-alder woodland have developed some ‘old growth’ characteristics with associated old forest lichens.|
Annex I habitats present as a qualifying feature, but not a primary
reason for selection of this site
Annex II species that are a primary reason for selection of this site
|1065 Marsh fritillary butterfly Euphydryas (Eurodryas, Hypodryas) aurinia|
|This is a large area of grassland/scrub mosaic with an extensive flushed grassland and fen component. The marsh fritillary Euphydryas aurinia population is small but stable and has the potential to expand over a wide area of favourable habitat.|
Annex II species present as a qualifying feature, but not a primary
reason for site selection
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