Alvar nordique et roches plates calcaires pré-cambriennes

Nordic alvar and Precambrian calcareous flatrocks are very species-rich ecosystems, with an ecological character strongly influenced by winter climatic conditions. Where a thin soil layer exists, it is often frozen to ice and covered with snow. Plants and animals have special adaptations to these conditions. For example the invertebrates must have strategies for overwintering. Annual freezing and thawing give rise to movements at the soil surface creating small patches of bare soil occupied by annual plants, a number of which are rare. The flat rocks may be covered with a thin layer of soil, which is the product of weathering of the underlying rock. The flora and fauna is very rich in species and many of them are rare.

Source : Référentiel HABREF v7 (INPN/MNHN)

6280 — Alvar nordique et roches plates calcaires pré-cambriennes est un habitat classé sous la typologie Habitats d'intérêt communautaire (Habitats d’intérêt communautaire). Il est un sous-niveau de l’habitat 62 — Formations herbeuses sèches semi-naturelles et faciès d'embuissonnement. Aucune espèce documentée comme inféodée à cet habitat n’est référencée dans la base actuelle.

Source : Ontologia (synthèse)