Article

One of the expeeted eonsequences of global change (due to elimatie ehange or to human aetivities, such as ehanges in land use) is the fragmentation of plant populations in small and isolated units moresuitable to disappear beeause the possibilities of gene fiow are interrupted and the redueed number of individua1s is not enough to faee environmental, genetie or demographie stoehastie events. These effeets are expeeted to be higher in rare or endemie speeies with a Iimited distribution, sinee these organisms are more sensitive to this kind of ehanges. In the present work, we studied the effeets of fragmentation of populations in three endemie plants from the Mediterranean region: Delphinium bolosii (Ranunculaceae), Pelrocoplis monlsicciana (Caryophyllaceae) and Seselifarrenyi (Apiaceae). They are threatened plants and proteeted by law. They also have different degree offioral complexity and different degree ofpollinator speeialization. We analyzed the effeets offragmentation using eomparisons ofpairs ofpopulations (Iarge-small) at two levels: the reproduetive sueeess (measured through pollinator visitation rates, quantity and quality of pollination services and seed set) and the parameters of genetic diversity (using allozyme eleetrophoresis). Results ofthis study will allow postulate bases for the management and eonservation ofthese speeies.