EUNIS habitat classification 2017 > U - Inland habitats with no or little soil and mostly with sparse vegetation > U2 - Screes > U25 - Boreal and arctic base-rich scree and block field

Boreal and arctic base-rich scree and block field

Description (English)

Boreal and arctic base-rich screes and block fields comprise talus or freeze-thaw block fields of calcareous rocks in the southern boreal to arctic regions, mainly in the Scandinavian Mountains, Iceland and Svalbard. Because of the considerable variation in climate, the habitat harbours a large diversity of species and plant communities, but it includes only sparse assemblages of vascular plants growing in sparse patches. These are dependent on the natural or semi-natural disturbance regime, periodic rockfall and continuing instability of the substrate in the case of screes, and in some regions also a long tradition of grazing.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code U25
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 Saussurea alpina
Flowering Plants Thalictrum alpinum
Ferns Selaginella selaginoides
Flowering Plants Tofieldia pusilla
Flowering Plants Juncus biglumis
Flowering Plants Betula nana
Flowering Plants Viola biflora
Flowering Plants Potentilla nivea
Flowering Plants Arenaria pseudofrigida
Flowering Plants Carex stenolepis
Flowering Plants Antennaria alpina
Flowering Plants Salix reticulata
Flowering Plants Draba norvegica
Flowering Plants Erigeron uniflorus
Flowering Plants Pedicularis palustris
Flowering Plants Salix polaris
Flowering Plants Vahlodea atropurpurea
Flowering Plants Trichophorum alpinum
Flowering Plants Rhinanthus groenlandicus

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
Saussurea alpina Flowering Plants
Thalictrum alpinum Flowering Plants
Selaginella selaginoides Ferns
Tofieldia pusilla Flowering Plants
Juncus biglumis Flowering Plants
Betula nana Flowering Plants
Viola biflora Flowering Plants
Potentilla nivea Flowering Plants
Arenaria pseudofrigida Flowering Plants
Carex stenolepis Flowering Plants
Antennaria alpina Flowering Plants
Salix reticulata Flowering Plants
Draba norvegica Flowering Plants
Erigeron uniflorus Flowering Plants
Pedicularis palustris Flowering Plants
Salix polaris Flowering Plants
Vahlodea atropurpurea Flowering Plants
Trichophorum alpinum Flowering Plants
Rhinanthus groenlandicus Flowering Plants
Flowering Plants Saussurea alpina
Ferns Selaginella selaginoides
Flowering Plants Festuca ovina
Flowering Plants Viola biflora
Flowering Plants Betula nana
Flowering Plants Vaccinium vitis-idaea
Flowering Plants Thalictrum alpinum
Flowering Plants Vaccinium uliginosum
Flowering Plants Ranunculus acris
Flowering Plants Solidago virgaurea
Ferns Equisetum palustre
Flowering Plants Empetrum nigrum
Flowering Plants Carex bigelowii
Flowering Plants Andromeda polifolia
Flowering Plants Tofieldia pusilla
Flowering Plants Potentilla erecta
Flowering Plants Geranium sylvaticum
Mosses & Liverworts Aulacomnium palustre
Flowering Plants Salix reticulata

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
Saussurea alpina Flowering Plants
Selaginella selaginoides Ferns
Festuca ovina Flowering Plants
Viola biflora Flowering Plants
Betula nana Flowering Plants
Vaccinium vitis-idaea Flowering Plants
Thalictrum alpinum Flowering Plants
Vaccinium uliginosum Flowering Plants
Ranunculus acris Flowering Plants
Solidago virgaurea Flowering Plants
Equisetum palustre Ferns
Empetrum nigrum Flowering Plants
Carex bigelowii Flowering Plants
Andromeda polifolia Flowering Plants
Tofieldia pusilla Flowering Plants
Potentilla erecta Flowering Plants
Geranium sylvaticum Flowering Plants
Aulacomnium palustre Mosses & Liverworts
Salix reticulata 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

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) H2.2 Cold limestone screes same
European Red List of Habitats H2.2 Boreal and arctic base-rich scree same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 H2.2 Cold limestone screes same
EUNIS Habitat Classification 200308 H2.2 Cold limestone screes same
EUNIS Habitat Classification 200202 H2.2 Cold limestone screes same
EUNIS Habitat Classification 199910 H2.2 Boreal limestone screes same
EUNIS Habitat Classification 199811 H2.2 Boreal limestone screes same
EUNIS Habitat Classification 199712 H2.2 Boreo-alpine limestone screes same
Palaearctic Habitat Classification 199905 61.62 Arctic sandwort calcicline screes same
Palaearctic Habitat Classification 1997 61.62 Arctic sandwort calcicline screes same
Palaearctic Habitat Classification 1996 61.62   same
Palaearctic Habitat Classification 1993 61.62   same
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