Ecologie d'une espèce endémique en milieu insulaire: <i>Cyclamen balearicum</i> Willk. aux Îles Baléares

Abstract

We studied Cyclamen balearicum Willk. in the Balearic Islands with the following two objectives: 1) to describe and discuss its ecology, 2) to discuss the type of rarity it represents. The species grows on Ibiza, Cabrera, Menorca and Mallorca; it is much more frequent on the latter two islands, and is abundant in the moutainous northern part of Mallorca. It is absent from Formentera. The species was found along the entire elevation gradient, thus experiencing a large range of rainfall and temperature conditions. It was encountered not only on limestone but also, occasionally on sandstone and schist in Menorca. Its local habitat is sheltered and shady, with a northern exposure, under a high cover of evergreen woody plants, with a stony soil. Quercus ilex L. and Pinus halepensis Mill, trees and Pistacia lentiscus L. shrubs are the more commonly observed dominant species where C. balearicum occuis. The usual entena applied in defining plant rarity are inadequate in this case, particularly where habitat specificity is concemed.