Ilots et petites îles de la Baltique boréale

« Groups of skerries, islets or single small islands, mainly in the outer archipelago or offshore areas.Composed of Precambrian, metamorphic bedrock, till or sediment. The vegetation of boreal Baltic islets and small islands is influenced by the brackish water environment, the ongoing land upheaval (in areas with intense land upheaval) and the climatic conditions. The vegetation types are influenced by wind, dry weather, salt and many hours of sunlight. Land-upheaval causes a succession of different vegetation types. Bare bedrock is common. A lot of small islands have no trees. The vegetation is usually very sparse and consists often of mosaic-like pioneer vegetation communities. On some islands the species diversity is increased by nitrogenous excrement from birds. Many of the plants are xerophytic and lichens are common. Temporary or permanent rockpools are common and these are inhabited by a variety of aquatic plant and animal species. Boreal Baltic islets and small islands are important nesting sites for birds and resting sites for seals. The surrounding sublittoral vegetation is also included in the type 1620. »

Description de la typologie HabitatsType de milieu décrit par une typologie officielle (EUNIS, HABREF), par exemple « Chênaies acidiphiles ». Glossaire › d’intérêt communautaire (HIC), via HABREF v7 (INPN).