5 research outputs found
LA DIVERSITÉ FLORISTIQUE DES PELOUSES HUMIDES D’ALTITUDE: CAS DE QUELQUES SITES DU HAUT ATLAS MAROCAIN
Résumé. Dans le Haut Atlas, les pelouses humides et pozzines constituent des pâturages assez convoités. Leur flore se caractérise par une grande richesse spécifique: 165 taxons inventoriés dans la zone d’étude (plateau de l’Oukaimeden, plateau de Tichka et l’amont de la haute vallée d’Ait Mizane) avec un taux d’endémisme estimé à 30,3% et un degré de rareté qui atteint 31%. Dans un contexte dominé par l’élément méditerranéen, la flore de ces pelouses est très enrichie de souches septentrionales 15,7%, repoussées vers nos latitudes méridionales lors des dernières glaciations. Ces zones humides vulnérables de par leur structure, fonctionnement écologique et état de conservation, se trouvent très touchées par les changements climatiques et les mutations environnementales récentes. Summary. In the High Atlas mountains, the wet grasslands and pozzines constitute a highly coveted pastoral resource. Its flora is characterized by a great specific richness: 165 taxa are recorded in the study area (Oukaimeden plateau, Tichka plateau and the upstream of the Ait Mizane high valley) and schow a rate of endemism estimated at 30.3% and a degree of rarity reaching 31%. In a Mediterranean context, the wet grasslands flora is supplemented with plants of northern origin 15.7%, pushed towards the extreme southern latitudes during the last glaciations. These wet pastures, highly sensitive by their structure, ecological functions and their conservation state, are very affected by the climatic changes and the global environmental changes
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Conservation assessments and Red Listing of the endemic Moroccan flora (monocotyledons)
Morocco constitutes an important centre of plant diversity and speciation in the Mediterranean Basin. However, numerous species are threatened by issues ranging from human activities to global climatic change. In this study,
we present the conservation assessments and Red Listing of the endemic Moroccan monocotyledons according to
International Union for Conservation of Nature (IUCN) criteria and categories. For each species, we include basic
taxonomic information, local names and synonyms, uses, a distribution map, extent of occurrence, area of
occupancy, population size and trend, a description of habitats and ecological requirements, and a discussion of the
threats affecting the species and habitats. We assessed the threatened status of the endemic Moroccan monocotyledons
at the species level (59 species) using the IUCN Red List criteria and categories (Version 3.1). This study
shows the high extinction risk to the Moroccan monocotyledon flora, with 95% of threatened species (20% Critically
Endangered, 50% Endangered, 25% Vulnerable) and only 5% not threatened (2% Near Threatened and 3% Least
Concern). The flora is thus of conservation concern, which is poorly recognized, both nationally and internationally.
The study presents the first part and so far the only national IUCN Red Data List for a large group of Moroccan
plants, and thus provides an overview of the threatened Moroccan flora. This IUCN Red List is an important first
step towards the recognition of the danger to Moroccan biodiversity hotspots, conservation of threatened species
and the raising of public awareness at national and international levels