| Titre : |
Endemic vascular plants in the Nordic flora |
| Type de document : |
texte imprimé |
| Auteurs : |
Bengt Jonsell, Auteur ; Thomas Karlsson, Auteur |
| Importance : |
pp. 123-133 |
| Langues : |
Anglais (eng) |
| Catégories : |
[ZG] Scandinavie
[Thèmes] Flore vasculaire (phanérogames et cryptogames vasculaires)
|
| Mots-clés : |
endémisme glaciation |
| Résumé : |
"The endemic taxa of vascular plants of the Nordic countries amount to about 130, of which 46 are currently regarded as species (Hieracium, Taraxacum, and the Ranunculus auricomus complex exc1uded). A postglacial origin, i.e. a time span of maximally 10,000 years of evolution, is now postulated for ail Nordic endemics. There are five allopolyploid sexual endemic species; Arabidopsis suecica, Corydalis gotlandica, Draha cacuminum, Prim uZa scandinavica and Saxifraga osloënsis. Outside the large apomictic groups mentioned above, only about 40 apomictic endemics are recognized. A large proportion of the non-hybrid and non-apomictic endemics have probably originated from ecotypes. Many Nordic endemics are members of intricate species complexes with subtle and often disputed taxonomie Iimits. The Nordic endemics are geographically concentrated, but far from exc1usively, to a number of 'hot' areas with particular ecological and historical conditions, the most important of which are the Scandes, the Baltic land-lift shores and the Baltic Iimestone islands of Gland and Gotland. A smaller number of endemic taxa are found at the coasts of NW Jylland (Denmark), along the Arctic Ocean coast, and in Iceland. The isolated Nordic islands and the island groups to the north and west (Spitzbergen, Jan Mayen, and the Faroes) have few or no endemic taxa." (source : auteurs) |
| Type de publication : |
article de livre |
| Référence biblio : |
Jonsell B., Karlsson T., 2006 - Endemic vascular plants in the Nordic flora. In : Bailey J., Ellis G., Eds, 2006 - Current taxonomic research on the British & European Flora (Leicester, 13-14 September 2003). London : Botanical Society of the British Isles, 123-133. |
| ID PMB : |
6453 |
| Permalink : |
http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=6453 |
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