EUNIS habitat classification 2017 > U - Inland habitats with no or little soil and mostly with sparse vegetation > U2 - Screes > U24 - Mediterranean siliceous scree

Mediterranean siliceous scree

Description (English)

Siliceous screes derived from various sedimentary, igneous and metamorphic rocks occurring on lower slopes in the Mediterranean. Rock debris is often mixed with fine soil. Vegetation cover can be completely lacking or consisting only of bryophyte and lichen communities. In most cases, however, these screes support open vegetation of vascular plants, which tends to be poorer in species than Mediterranean calcareous screes. Natural succession is slower than in temperate screes. Screes overgrown with shrublands or forest do not belong to this habitat.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type	code U24
Relation to	Annex I habitat types (EU Habitats Directive)
Relation to	Resolution 4 habitat type (used for designation of Emerald sites)

Legal status

Relation to other habitat types mentioned in legal instruments

Legal text	Annex	Name in legal text	Code in legal text	Habitat type relationship	More information
Council Directive 92/43/EEC of 21 May 1992 on the conservation of natural habitats and of wild fauna and flora - consolidated version 01/01/2007	Annex I: natural habitat types of community interest whose conservation requires the designation of special areas of conservation	Western Mediterranean and thermophilous scree	8130	Overlap	http://ec.europa.eu/environm...rective/index_en.htm
Council Directive 92/43/EEC of 21 May 1992 on the conservation of natural habitats and of wild fauna and flora - consolidated version 01/01/2007	Annex I: natural habitat types of community interest whose conservation requires the designation of special areas of conservation	Eastern Mediterranean screes	8140	Overlap
Convention on the conservation of European wildlife and natural habitats	Revised Annex I of Resolution 4 (1996) of the Bern Convention on endangered natural habitats types using the EUNIS habitat classification (year of revision 2010)	Acid siliceous screes of warm exposures	H2.5	Narrower	https://wcd.coe.int/ViewDoc....ckColorLogged=FDC864 Resolution No. 4 (1996) of the Bern Convention lists endangered natural habitats requiring specific conservation measures [and the designation of Areas of Special Conservation Interest (ASCIs) forming the Emerald network]

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Indicator species

Diagnostic species

Constant species

Dominant species

Flowering Plants Viola crassiuscula

Ferns Cryptogramma crispa

Flowering Plants Festuca clementei

Flowering Plants Euphorbia nevadensis

Flowering Plants Silene inaperta

Flowering Plants Reseda complicata

Flowering Plants Stachys corsica

Diagnostic species occur concentrated in the habitat in question, but are absent or rare in other habitats. They are good positive indicators of the habitat, but they do not need to occur in every location of the habitat.

Species scientific name	English common name	Species group
Viola crassiuscula		Flowering Plants
Cryptogramma crispa		Ferns
Festuca clementei		Flowering Plants
Euphorbia nevadensis		Flowering Plants
Silene inaperta		Flowering Plants
Reseda complicata		Flowering Plants
Stachys corsica		Flowering Plants

Flowering Plants Digitalis purpurea

Ferns Cryptogramma crispa

Flowering Plants Avenella flexuosa

Constant species occur frequently in the habitat, but they may include generalist species that are also frequent in other habitats.

Species scientific name	English common name	Species group
Digitalis purpurea		Flowering Plants
Cryptogramma crispa		Ferns
Avenella flexuosa		Flowering Plants

Dominant species are those that often reach high cover in the habitat, thus determining the habitat physiognomy.

Species scientific name	English common name	Species group

Please note that a maximum of 20 species of each indicator category is shown.

Other classifications

Classification	Code	Habitat type name	Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012)	H2.5	Acid siliceous screes of warm exposures	narrower

For relation to plant communities (syntaxa), see Vegetation types

History

Classification	Code	Habitat type name	Relationship type
EUNIS Habitat Classification 200410	H2.5	Acid siliceous screes of warm exposures	same
EUNIS Habitat Classification 200308	H2.5	Acid siliceous screes of warm exposures	same
EUNIS Habitat Classification 200202	H2.5	Acid siliceous screes of warm exposures	same
EUNIS Habitat Classification 199910	H2.5	Acid siliceous screes of warm exposures	same
EUNIS Habitat Classification 199811	H2.5	Acid siliceous screes of warm exposures	same
EUNIS Habitat Classification 199712	H2.5	Siliceous screes of warm exposures	same
Palaearctic Habitat Classification 199905	61.3	Part of Western Mediterranean and thermophilous screes	wider
Palaearctic Habitat Classification 1997	61.3	Part of Western Mediterranean and thermophilous screes	wider
Palaearctic Habitat Classification 1996	61.3		wider
Palaearctic Habitat Classification 1993	61.3		wider
CORINE Biotopes Classification 1991	61.3		wider
CORINE Biotopes Classification 1989	61.3		wider

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