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Biotopes & milieux

Biotope - Typologie Européenne EUNIS

H3.6 - Niveau 3 : Affleurements et rochers érodés
Description
Rocks and outcrops colonized by pioneer communities, especially of Crassulaceae. The substrates are mostly siliceous, occurring in the alpine or montane levels of higher mountains of the nemoral zone. The communities are dominated by succulent Sempervivum arachnoideum ssp. arachnoideum, Sempervivum arachnoideum ssp. tomentosum, Sempervivum montanum ssp. montanum, Sempervivum montanum ssp. stiriacum, Sempervivum wulfenii, Jovibarba arenaria, Sedum montanum, Sedum anglicum ssp. pyrenaicum, Sedum sexangulare, Sedum album, Sedum annuum, Saxifraga aspera, accompanied by Silene rupestris, Scleranthus polycarpos, Veronica fruticans, Thymus praecox ssp. polytrichus, Viola tricolor ssp. saxatilis, by small crucifers, lichens and mosses.
Taxons (Liens actifs si espèces présentes)
Enteromorpha sp., Enteromorpha sp., Laminaria sp., Mysidae sp., Nemertea sp., Oligochaeta sp., Pagurus sp., Phyteuma sp., Pomatoceros sp., Pomatoceros sp., Sempervivum arachnoideum subsp. arachnoideum L., 1753, Sempervivum montanum var. montanum L., 1753, Sesleria sp., Spirorbidae sp., Terebellidae sp., Ulva sp.,
H3.62 - Niveau 4 : Affleurements et rochers érodés à végétation clairsemée
Description
Rocks and outcrops colonised by pioneer communities, especially of Crassulaceae. Vegetation of the alliance Sedo-Scleranthion biennis. Substrates are mostly siliceous, occurring in the upland and montane levels of the nemoral zone. The communities are dominated by succulent Sempervivum, Jovibarba and Sedum species accompanied by Silene rupestris, Erophila verna, Scleranthus polycarpos, Veronica fruticans, Thymus praecox ssp. polytrichus, Viola tricolor ssp. saxatilis, by small crucifers, lichens and mosses Polytrichum piliferum and Racomitrium canescens.
Taxons (Liens actifs si espèces présentes)
Crassulaceae J.St.-Hil., 1805 [nom. cons.] ( Esp. caract. )
Erophila verna (L.) Chevall., 1827 ( Esp. caract. )
Jovibarba (DC.) Opiz, 1852 ( Esp. caract. )
Polytrichum piliferum Hedw., 1801 ( Esp. caract. )
Racomitrium canescens (Hedw.) Brid., 1819 ( Esp. caract. )
Scleranthus polycarpos L., 1756 ( Esp. caract. )
Sedum L., 1753 [nom. et typ. cons.] ( Esp. caract. )
Sempervivum L., 1753 ( Esp. caract. )
Silene rupestris L., 1753 ( Esp. caract. )
Thymus praecox subsp. polytrichus (A.Kern. ex Borbás) Jalas, 1970 ( Esp. caract. )
Veronica fruticans Jacq., 1762 ( Esp. caract. )
Viola tricolor subsp. saxatilis (F.W.Schmidt) Arcang., 1882 ( Esp. caract. )
Analyse Ecologie du milieu (En fonction des espèces présentes)