La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Patterns and correlates of exotic and endemic plant taxa in the Balearic Islands
Auteurs :	Montserrat Vilà, Auteur ; Irma Munoz, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (25(2) 1999)
Article en page(s) :	153-161
Résumé :	We analysed the taxonomy and biogeography of endemic and exotic plants in the Balearic Islands (Spain), one of the "hot-spots" of the Mediterranean Basin. Richness, diversity and density (number of taxa/log10 area) of exotic taxa (species and subspecies) is higher than that of endemic taxa. Mallorca is the island with the highest number of endemic and exotic taxa. On average, exotic and endemic taxa are little abundant or rare and represent 8.4% and 6% of the total flora, respectively. The taxonomic distribution of both exotic and endemic species is not random: Solanaceae, Amaranthaceae, Iridaceae and Euphorbiaceae are over-represented families within the exotic taxa. Plumbaginaceae, Labiatae and Rubiaceae are over-represented among endemics. While most exotic taxa are therophytes, chamaephytes are the dominant life-form among endemics. Exotics are mainly found in cultivated areas, in disturbed and ruderal communities, while most endemics are located in rocky habitats. Coastal communities display a great proportion of endemic taxa (35.94%), and are little represented by exotic taxa (5.94%). It is in this habitat where most effort should be addressed in order to preserve both endemic and non-endemic native vegetation.

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