Assessing the vulnerability of habitats through plant rarity patterns in the Pyrenean range

Biodiversity is being severely affected by global change worldwide, but consequences differ across individual species and environments. Since rarity a condition associated with vulnerability extinction risk, it concerning factor itself that can also amplify the detrimental impact of drivers. Here, we assess differences in derived from environments South European mountain range, Pyrenees, complex landscape sheltering more than 3400 vascular plants. We first analyzed patterns alpha taxonomic (richness) phylogenetic diversity (standardized diversity, sesPD) 18,000 plant surveys 14 different habitats to find out which ones shelter highest diversity. Then, classified according four criteria (Pyrenean endemic, regional geographic ecological specialization local abundance) estimated their frequency among contribution PD. Generalized linear models were used compare richness sesPD habitats, relationship between each metric rare proportion was assessed. Grasslands harbor greatest number are poor sesPD, while inland surface waters contain fewer most phylogenetically diverse. Deciduous, evergreen Mediterranean forests show both high sesPD. Rare account for half pool, abundant higher Diversity metrics showed opposite tendencies them proportion, emphasizing they not interchangeable. Our results highlight rocky water-related due shelter, only latter match other assessments habitat The analysis guide conservation efforts identifying priority targets when information about direct threats scarce or incomplete.