Western Mediterranean base-rich scree

Description (English)

Calcareous and ultrabasic scree, with boulders, rock debris and riverine gravel derived from sedimentary and metamorphic rocks, ultramafics and basic volcanics occurring through the western Mediterranean, from lowlands to the high mountains. Epilithic bryophytes and lichens may be very diverse, particularly in the mountains, where they are mostly found in crevices and other shady and humid microsites of immobile boulders. The vascular plant vegetation comprises hemicryptophytes and chamaephytes adapted to the mechanical disturbance caused by scree movements, shortages in water supply and lack of fine-grained soil. The habitat becomes scarcer and more scattered in the foothills and lowlands and more prone to be affected by human disturbances, such as quarrying and infrastructure development. Nevertheless, high mountain screes are usually well preserved in a very natural state.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code U28
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Indicator species

Diagnostic species
Constant species
Dominant species
Flowering Plants Galeopsis angustifolia
Flowering Plants Ptychotis saxifraga
Flowering Plants Erodium daucoides
Flowering Plants Rumex scutatus

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
Galeopsis angustifolia Flowering Plants
Ptychotis saxifraga Flowering Plants
Erodium daucoides Flowering Plants
Rumex scutatus Flowering Plants
Flowering Plants Rumex scutatus
Flowering Plants Vincetoxicum hirundinaria
Flowering Plants Picris hieracioides
Flowering Plants Galeopsis angustifolia
Flowering Plants Sedum sediforme
Flowering Plants Melica ciliata

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
Rumex scutatus Flowering Plants
Vincetoxicum hirundinaria Flowering Plants
Picris hieracioides Flowering Plants
Galeopsis angustifolia Flowering Plants
Sedum sediforme Flowering Plants
Melica ciliata 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

Other classifications

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 H2.6 Calcareous and ultra-basic screes of warm exposures same
EUNIS Habitat Classification 200308 H2.6 Calcareous and ultra-basic screes of warm exposures same
EUNIS Habitat Classification 200202 H2.6 Calcareous and ultra-basic screes of warm exposures same
EUNIS Habitat Classification 199910 H2.6 Calcareous and ultra-basic screes of warm exposures same
EUNIS Habitat Classification 199811 H2.6 Calcareous and ultra-basic screes of warm exposures same
EUNIS Habitat Classification 199712 H2.6 Calcareous screes of warm exposures same
Palaearctic Habitat Classification 199905 61.4 Eastern Mediterranean screes narrower
Palaearctic Habitat Classification 199905 61.3 Part of Western Mediterranean and thermophilous screes narrower
Palaearctic Habitat Classification 199905 61.5 Illyrian screes narrower
Palaearctic Habitat Classification 1997 61.5 Illyrian calcareous screes narrower
Palaearctic Habitat Classification 1997 61.3 Part of Western Mediterranean and thermophilous screes narrower
Palaearctic Habitat Classification 1996 61.5   narrower
Palaearctic Habitat Classification 1996 61.3   narrower
Palaearctic Habitat Classification 1993 61.3   narrower
Palaearctic Habitat Classification 1993 61.5   narrower
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100