Ecogeographic and genetic evaluation of endemic species in the Maritime Alps: the case of Moehringia lebrunii and M. sedoides (Caryophyllaceae)

Abstract

The Maritime Alps are one of the ‘hot spots’ in the Mediterranean basin. This study investigated two endemic plants, Moehringia lebrunii and Moehringia sedoides (Caryophyllaceae) in order to increase knowledge of the vegetation of this region, and to investigate possible conservation strategies. Ecogeographic surveys and molecular analyses were undertaken. Gene diversity, the Shannon index and G_ST were calculated within and among populations of the two species based on ISSR data. The populations of M. lebrunii had a density ranging between 0.04 and 0.86 individual/m² and a rather low inner genetic variability value. According to IUCN Red List Criteria, the current status of M. lebrunii is Endangered EN B2ab(ii, iv)]. M. sedoides is an endemic of the SW Alps (not exclusive of the Maritime Alps), and is very abundant within the core of the range. Its range of occurrence is smaller than previously reported; nevertheless, the species is not under threat. This taxon showed a population density ranging between 0.03 and 0.58 individual/m². Genetic variability values revealed a high variation among the species. Only peripheral populations seemed to suffer from their segregated position. Thus, M. sedoides is to be considered Critically Endangered CR B1ab(i, ii, iii, iv) + 2ab(i, ii, iii, iv)] for Italy according to Regional Guidelines.