We studied the floristic composition and vegetation of the Acarí River basin and boundaries, located in Caravelí province at the west of the department of Arequipa, and performed between 2006 and 2013. A total of 86 vascular species were identified from 38 families. As for the life forms, they were dominated by grasses, shrubs and trees, being the majority natives, introduced and some endemic. We identified the life zone represented by the dry desert with two coastal phytosociological units consisting of Equiseto gigantei-Salicetum humboldtianae, the subassociation indigoferetum suffruticosae and Baccharido salicifoliae-Gynerietum sagittati. The floristic composition of the phytosociological units demonstrates a median richness of species, consisting of both native and introduced, being the best represented families, Asteraceae, Fabaceae, Poaceae, and Malvaceae. The Braun-Blanquet phytosociological method was applied for community analysis; the classification of the communities was made by means of TWINSPAN software, DCCA ordination analysis applied with the software CANOCO 4.5 and dendrogram analysis based on species correlations with numerical information for each quadrant, develop with the software PC-ORD. Major studies are still needed in order to have a wider vision on the ecology of the plant communities in other geographic zones, and evaluate how the vegetation can be affected with climate change. Key words: floristic composition, vegetation, phytosociology, dry desert, river basin, Acarí river, Caravelí, Arequipa.
|Publication status||Published - 2014|